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    • CommentRowNumber101.
    • CommentAuthorUrs
    • CommentTimeJan 20th 2020

    added pointer to today’s

    • Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar, S. Uma Sankar, New Physics solutions for b→cτbarνb \to c \tau bar \nu anomalies after Moriond 2019 (arXiv:2001.06344)

    diff, v108, current

    • CommentRowNumber102.
    • CommentAuthorUrs
    • CommentTimeJan 21st 2020
    • (edited Jan 21st 2020)

    added a sentence to the end of the Idea-section:

    Notice that the channel R KR_K is just one of many in which flavour anomalies may and have been seen. There are other decay channels of B-mesons and there are also flavour anomalies in decays of, for instance, kaons (Buras 16, Buras 18).

    diff, v109, current

    • CommentRowNumber103.
    • CommentAuthorUrs
    • CommentTimeJan 21st 2020

    added graphics with cartoon of the B→K *μ +μ −B \to K^\ast \mu^+ \mu^- decay from Altmannshofer 14

    diff, v111, current

    • CommentRowNumber104.
    • CommentAuthorUrs
    • CommentTimeJan 27th 2020

    added pointer to today’s

    • Quan-Yi Hu, Lin-Lin Huang, Explaining b→sℓ +ℓ −b\to s \ell^+ \ell^- data by sneutrinos in the R-parity violating MSSM (arXiv:1912.03676)

    diff, v112, current

    • CommentRowNumber105.
    • CommentAuthorUrs
    • CommentTimeFeb 4th 2020

    added pointer to today’s

    • Florian U. Bernlochner, Stephan Duell, Zoltan Ligeti, Michele Papucci, Dean J. Robinson, Das ist der HAMMER: Consistent new physics interpretations of semileptonic decays (arXiv:2002.00020)

    diff, v113, current

    • CommentRowNumber106.
    • CommentAuthorUrs
    • CommentTimeFeb 7th 2020
    • (edited Feb 7th 2020)

    added today’s publication data to

    • Ufuk Aydemir, Tanumoy Mandal, Subhadip Mitra, Addressing the R D (*)R_{D^{(\ast)}} anomalies with an S1 leptoquark from SO(10)SO(10) grand unification, Phys. Rev. D 101, 015011 (2020) (arXiv:1902.08108)

    diff, v114, current

    • CommentRowNumber107.
    • CommentAuthorUrs
    • CommentTimeFeb 14th 2020

    added pointer to today’s

    • Andrei Angelescu, Darius A. Faroughy, Olcyr Sumensari, Lepton Flavor Violation and Dilepton Tails at the LHC (arXiv:2002.05684)

    diff, v115, current

    • CommentRowNumber108.
    • CommentAuthorUrs
    • CommentTimeFeb 17th 2020
    • (edited Feb 17th 2020)

    added pointer to today’s

    • Sneha Jaiswal, Soumitra Nandi, Sunando Kumar Patra, Updates on SM predictions of |V cb|\vert V_{c b}\vert and R(D (*))R(D^{(\ast)}) in B→D *ℓν ℓB\to D^\ast \ell \nu_\ell decays (arXiv:2002.05726)

    diff, v116, current

    • CommentRowNumber109.
    • CommentAuthorUrs
    • CommentTimeFeb 18th 2020

    added pointer to today’s replacement

    • Richard H. Benavides, Luis Muñoz, William A. Ponce, Oscar Rodríguez, Eduardo Rojas, Minimal Z ′Z^\prime models for flavor anomalies (arXiv:1812.05077)

    diff, v117, current

    • CommentRowNumber110.
    • CommentAuthorUrs
    • CommentTimeFeb 19th 2020

    added pointer to todsy’s

    diff, v118, current

    • CommentRowNumber111.
    • CommentAuthorUrs
    • CommentTimeFeb 19th 2020

    Under Relation to other anomalies I added a graphics grabbed from today’s arXiv:2002.07184

    diff, v119, current

    • CommentRowNumber112.
    • CommentAuthorUrs
    • CommentTimeFeb 19th 2020

    added pointer also to this one from today:

    • Kingman Cheung, Zhuo-Ran Huang, Hua-Dong Li, Cai-Dian Lü, Ying-nan Mao, Ru-Ying Tang, Revisit to the b→cτνb \to c \tau \nu transition: in and beyond the SM (arXiv:2002.07272)

    diff, v119, current

    • CommentRowNumber113.
    • CommentAuthorUrs
    • CommentTimeFeb 25th 2020

    added pointer to today’s

    • Quan-Yi Hu, Ya-Dong Yang, Min-Di Zheng, Revisiting the B-physics anomalies in R-parity violating MSSM (arXiv:2002.09875)

    diff, v120, current

    • CommentRowNumber114.
    • CommentAuthorUrs
    • CommentTimeMar 2nd 2020

    added pointer to today’s

    • Wolfgang Altmannshofer, P. S. Bhupal Dev, Amarjit Soni, Yicong Sui, Addressing R D *R_{D^\ast}, R K *R_{K^\ast}, muon g−2g-2 and ANITA anomalies in a minimal R-parity violating supersymmetric framework (arXiv:2002.12910)

    diff, v121, current

    • CommentRowNumber115.
    • CommentAuthorUrs
    • CommentTimeMar 9th 2020

    added pointer to today’s

    • Soumia Lebbal, Noureddine Mebarki, Jamal Mimouni, Lepton Flavor Universality Violation in a 331 Model in b→sl +l −b \to s l^+ l^- Processes (arXiv:2003.03230)

    diff, v122, current

    • CommentRowNumber116.
    • CommentAuthorUrs
    • CommentTimeMar 10th 2020

    added pointer to new measurements announced today by LHCb:

    Result: statistical significance of the anomaly in the channel B 0→K *0μ +μ −B^0 \to K^{\ast 0} \mu^+ \mu^- increases from 3.0σ3.0 \sigma to 3.3σ3.3 \sigma

    diff, v123, current

    • CommentRowNumber117.
    • CommentAuthorUrs
    • CommentTimeMar 10th 2020

    added pointer to the corresponding presentation

    • Eluned Smith on behalf of the LHCb collaboration, Update of the B 0→K *0μ +μ −B^0 \to K^{\ast 0} \mu^+ \mu^- angular analysis at LHCb, 2020 (pdf)

    and included the last slide from there as a graphics into the entry

    diff, v124, current

    • CommentRowNumber118.
    • CommentAuthorUrs
    • CommentTimeMar 11th 2020

    added pointer also to today’s announcement on the main CERN webpage:

    diff, v125, current

    • CommentRowNumber119.
    • CommentAuthorUrs
    • CommentTimeMar 14th 2020

    added pointer to today’s CERN-Courier article:

    diff, v127, current

    • CommentRowNumber120.
    • CommentAuthorUrs
    • CommentTimeMar 17th 2020

    added pointer to today’s

    • Lorenzo Calibbi, M.L. López-Ibáñez, Aurora Melis, Oscar Vives, Muon and electron g−2g-2 and lepton masses in flavor models (arXiv:2003.06633)

    diff, v128, current

    • CommentRowNumber121.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2020

    added pointer to today’s

    diff, v129, current

    • CommentRowNumber122.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2020

    added pointer to today’s

    and added its Table 1 to the entry

    diff, v129, current

    • CommentRowNumber123.
    • CommentAuthorUrs
    • CommentTimeApr 6th 2020

    added pointer to today’s

    • A. S. de Jesus, S. Kovalenko, F. S. Queiroz, K. Sinha, C. Siqueira, Vector-Like Leptons and Inert Scalar Triplet: Lepton Flavor Violation, g−2g-2 and Collider Searches (arXiv:2004.01200)

    diff, v130, current

    • CommentRowNumber124.
    • CommentAuthorUrs
    • CommentTimeApr 16th 2020

    added pointer to today’s

    • Rusa Mandal, Clara Murgui, Ana Peñuelas, Antonio Pich, The role of right-handed neutrinos in b→cτν¯b \to c \tau \bar \nu anomalies (arXiv:2004.06726)

    diff, v134, current

    • CommentRowNumber125.
    • CommentAuthorUrs
    • CommentTimeApr 20th 2020

    added pointer to today’s

    • Shaikh Saad, Anil Thapa, A Common Origin of Neutrino Masses and R D *R_{D^\ast}, R K *R_{K^\ast} Anomalies (arXiv:2004.07880)

    diff, v135, current

    • CommentRowNumber126.
    • CommentAuthorUrs
    • CommentTimeApr 21st 2020

    added pointer to today’s

    • P. S. Bhupal Dev, Rukmani Mohanta, Sudhanwa Patra, Suchismita Sahoo, Unified explanation of flavor anomalies, radiative neutrino mass and ANITA anomalous events in a vector leptoquark model (arXiv:2004.09464)

    diff, v136, current

    • CommentRowNumber127.
    • CommentAuthorUrs
    • CommentTimeApr 29th 2020
    • (edited Apr 29th 2020)

    finally added pointer to the publication

    that is behind that set of slides from Moriond 2019 that has long been cited in the entry:

    • Giacomo Caria on behalf of the Belle collaboration, Measurement of R(D)R(D) and R(D *)R(D^\ast) with a semileptonic tag at Belle, Moriond, EW 22/03/2019 (pdf)

    Then I added pointer to

    • Sneha Jaiswal, Soumitra Nandi, Sunando Kumar Patra, Updates on SM predictions of |V cb|\vert V_{c b}\vert and R(D (*))R(D^{(\ast)}) in B→D *ℓν ℓB\to D^\ast \ell \nu_\ell decays (arXiv:2002.05726)

    which does a re-analysis of the ℛ(D)\mathcal{R}(D)-anomaly including these new measurements (still finds a discrepancy of world averages in this channel at ∼3σ\sim 3 \sigma statistical significance)

    diff, v137, current

    • CommentRowNumber128.
    • CommentAuthorUrs
    • CommentTimeMay 1st 2020

    added pointer to today’s

    • Aritra Biswas, Soumitra Nandi, Ipsita Ray, Sunando Kumar Patra, New physics in $b\to s \ell \elk decays with complex Wilson coefficients (arXiv:2004.14687)

    diff, v138, current

    • CommentRowNumber129.
    • CommentAuthorUrs
    • CommentTimeMay 8th 2020

    added pointer to today’s

    • Bhubanjyoti Bhattacharya, Alakabha Datta, Saeed Kamali, David London, A Measurable Angular Distribution for B¯→D *τ −ν¯ τ\bar B \to D^\ast \tau^- \bar \nu_\tau Decays (arXiv:2005.03032)

    diff, v140, current

    • CommentRowNumber130.
    • CommentAuthorUrs
    • CommentTimeMay 12th 2020

    added pointer to today’s

    • Shaikh Saad, Combined explanations of (g−2) μ(g-2)_\mu, R D *R_{D^\ast}, R K *R_{K^\ast} anomalies in a two-loop radiative neutrino mass model (arXiv:2005.04352)

    diff, v141, current

    • CommentRowNumber131.
    • CommentAuthorUrs
    • CommentTimeMay 27th 2020

    added pointer to these recent talk notes:

    • Niels Tuning, Recent results from LHCb, Nikhef 2020 (nikhef event:2253, pdf)

      In recent years a number of results in flavour physics have drawn some attention due to tensions with respect to Standard Model predictions. An overview of these results will be shown, together with a few recent results from this Spring, both on the flavour anomalies and ’classical’ flavour physics

    diff, v142, current

    • CommentRowNumber132.
    • CommentAuthorUrs
    • CommentTimeMay 27th 2020

    added pointer also to

    diff, v142, current

    • CommentRowNumber133.
    • CommentAuthorUrs
    • CommentTimeMay 27th 2020

    added to the section “Status and Outlook” (here) a slide from Tuning 20 and a quote from Garisto 20

    diff, v142, current

    • CommentRowNumber134.
    • CommentAuthorUrs
    • CommentTimeJul 2nd 2020

    added publication data for:

    diff, v143, current

    • CommentRowNumber135.
    • CommentAuthorUrs
    • CommentTimeJul 10th 2020

    added pointer to today’s

    • Lina Alasfar, Aleksandr Azatov, Jorge de Blas, Ayan Paul, Mauro Valli, B anomalies under the lens of electroweak precision (arXiv:2007.04400)

    diff, v145, current

    • CommentRowNumber136.
    • CommentAuthorUrs
    • CommentTimeJul 14th 2020

    added pointer to today’s

    • A. Karozas, G. K. Leontaris, I. Tavellaris, N. D. Vlachos, On the LHC signatures of SU(5)×U(1)′SU(5) \times U(1)' F-theory motivated models (arXiv:2007.05936)

    diff, v147, current

    • CommentRowNumber137.
    • CommentAuthorUrs
    • CommentTimeAug 11th 2020

    added pointer to today’s

    • Suman Kumbhakar, Rukmani Mohanta, Investigating the effect of U 1U_1 vector leptoquark on b→uτν¯b \to u \tau \bar\nu mediated B decays (arXiv:2008.04016)

    diff, v148, current

    • CommentRowNumber138.
    • CommentAuthorUrs
    • CommentTimeAug 18th 2020

    added pointer to today’s

    • Syuhei Iguro, Teppei Kitahara, Implications for new physics from novel puzzle in B¯0(s)→D(∗)+(s){π−,K−} decays (arXiv:2008.01086)

    diff, v149, current

    • CommentRowNumber139.
    • CommentAuthorUrs
    • CommentTimeAug 20th 2020

    added pointer to today’s

    (these last three go in a section “hadronic decays” which might eventually want to be on a separate page)

    diff, v150, current

    • CommentRowNumber140.
    • CommentAuthorUrs
    • CommentTimeSep 4th 2020

    added pointer to today’s

    • K.S. Babu, P.S. Bhupal Dev, Sudip Jana, Anil Thapa, Unified Framework for BB-Anomalies, Muon g-2, and Neutrino Masses (arXiv:2009.01771)

    diff, v151, current

    • CommentRowNumber141.
    • CommentAuthorUrs
    • CommentTimeSep 7th 2020

    added pointer to today’s

    diff, v152, current

    • CommentRowNumber142.
    • CommentAuthorUrs
    • CommentTimeSep 17th 2020

    added pointer to today’s

    • Valerio Gherardi, David Marzocca, Elena Venturini, Low-energy phenomenology of scalar leptoquarks at one-loop accuracy (arXiv:2008.09548)

    diff, v153, current

    • CommentRowNumber143.
    • CommentAuthorUrs
    • CommentTimeSep 17th 2020
    • (edited Sep 17th 2020)

    Added a new graphics (here), from today’s GMV 20 (Fig. 9 there)

    diff, v153, current

    • CommentRowNumber144.
    • CommentAuthorUrs
    • CommentTimeOct 22nd 2020

    added pointer to today’s

    • Dayanand Mishra, Namit Mahajan On the Impact of Soft Photons on B→Kℓ +ℓ −B \to K \ell^+ \ell^- (arXiv:2010.10853)

    diff, v155, current

    • CommentRowNumber145.
    • CommentAuthorUrs
    • CommentTimeOct 28th 2020

    added pointer to today’s

    • Andreas Crivellin, Claudio Andreas Manzari, Marcel Alguero, Joaquim Matias, Combined Explanation of the Z→bb¯Z \to b \bar b Forward-Backward Asymmetry, the Cabibbo Angle Anomaly, τ→μνν\tau \to \mu \nu \nu and b→sℓ +ℓ −b \to s \ell^+ \ell^- Data (arXiv:2010.14504)

    diff, v158, current

    • CommentRowNumber146.
    • CommentAuthorUrs
    • CommentTimeOct 30th 2020
    • (edited Oct 30th 2020)

    added today’s announcement of a new measurement, confirming the flavour anomaly at 3.1σ3.1 \sigma, now also in B +B^+-decays:

    diff, v160, current

    • CommentRowNumber147.
    • CommentAuthorUrs
    • CommentTimeNov 3rd 2020
    • (edited Nov 3rd 2020)

    added pointer to today’s

    • Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca Silvestrini, Mauro Valli, Lessons from the B 0,+→B *,0,+μ +μ −B^{0,+} \to B^{\ast, 0,+} \mu^+ \mu^- angular analysis (arXiv:2011.01212)

    In the Standard Model Effective Theory (SMEFT) [41, 42], the significance of NewPhysics from the global b→sℓ +ℓ −b \to s \ell^+ \ell^- analysis increases with the inclusion of new data, reaching a maximum of almost 6σ for the simple hypothesis of a non-vanishing [[leptoquark contribution]].

    diff, v161, current

    • CommentRowNumber148.
    • CommentAuthorUrs
    • CommentTimeNov 12th 2020

    added pointer to today’s

    • Aishwarya Bhatta, Rukmani Mohanta, Implications of new physics in B→K 1μ +μ −B \to K_1 \mu^+ \mu^-−decay processes (arXiv:2011.05820)

    diff, v162, current

    • CommentRowNumber149.
    • CommentAuthorUrs
    • CommentTimeNov 17th 2020

    added pointer to today’s

    • Sang Quang Dinh, Hieu Minh Tran, Muon g−2g-2 and semileptonic BB decays in BDW model with gauge kinetic mixing (arXiv:2011.07182)

    and to its precursor

    • Geneviève Bélanger, Cédric Delaunay, Susanne Westhoff, A Dark Matter Relic From Muon Anomalies, Phys. Rev. D 92, 055021 (2015) (arXiv:1507.06660)

    diff, v163, current

    • CommentRowNumber150.
    • CommentAuthorUrs
    • CommentTimeDec 11th 2020

    added pointer to today’s

    • Francesco D’Eramo, Nejc Košnik, Federico Pobbe, Aleks Smolkovič, Olcyr Sumensari, Leptoquarks and Real Singlets: A Richer Scalar Sector Behind the Origin of Dark Matter (arXiv:2012.05743)

    diff, v165, current

    • CommentRowNumber151.
    • CommentAuthorUrs
    • CommentTimeDec 14th 2020

    added pointer to today’s

    • J. Kriewald, C. Hati, J. Orloff, A. M. Teixeira, A combined explanation of the B-meson decay anomalies with a single vector leptoquark (arXiv:2012.06315)

    diff, v166, current

    • CommentRowNumber152.
    • CommentAuthorUrs
    • CommentTimeJan 23rd 2021

    Added pointer to today’s review:

    • Florian U. Bernlochner, Manuel Franco Sevilla, Dean J. Robinson, Guy Wormser, Semitauonic b-hadron decays: A lepton flavor universality laboratory (arXiv:2101.08326)

    diff, v171, current

    • CommentRowNumber153.
    • CommentAuthorUrs
    • CommentTimeMar 2nd 2021

    I have added pointer to today’s survey of the state of the matter:

    and included the following quote (their emphasis!):

    Both R KR_K and P′ 5P'_5 have moved towards the Standard Model, but this actually improves the New Physics fits.

    The set of b→sℓℓb \to s \ell \ell anomalies are alive and a global coherence remains after the measurements in 2019 and 2020. While some key measurements have central values that have moved towards the Standard Model predictions, the overall consistency of the data and the global tension with respect to the Standard Model has not diminished (in fact this may even enhance the significance for New Physics). The New Physics fit is a good fit (with pp-values in the ballpark of 50%), and the SM pull is high [[…]]. In addition, data sets from all different experiments are compatible [[…]].

    diff, v175, current

    • CommentRowNumber154.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2021

    added pointer to today’s

    • Andrei Angelescu, Damir Bečirević, Darius A. Faroughy, Florentin Jaffredo, Olcyr Sumensari, On the single leptoquark solutions to the B-physics anomalies (arXiv:2103.12504)

    diff, v178, current

    • CommentRowNumber155.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2021

    added pointer to todays’s

    • {#HLN21} Gudrun Hiller, Dennis Loose, Ivan Nišandžić, Flavorful leptoquarks at the LHC and beyond: Spin 1 (arXiv:2103.12724)

    with the quote:

    Naive combination of R KR_K and R K*R_{K*} measurements shows a deviation from the standard model above 4σ4 \sigma

    diff, v178, current

    • CommentRowNumber156.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2021

    added pointer to today’s

    • Li-Sheng Geng, Benjamín Grinstein, Sebastian Jäger, Shuang-Yi Li, Jorge Martin Camalich, Rui-Xiang Shi, Implications of new evidence for lepton-universality violation in b→sℓ +ℓ −b \to s \ell^+ \ell^- decays (arXiv:2103.12738)

    with this quote:

    We find that the data on clean observables is at variance with the SM at a level of 3.9signa3.9 \signa. Furthermore, scenarios withpure left-handed or axial currents provide a better desciption of these data with a significance close to 5σ5 \sigma.

    diff, v178, current

    • CommentRowNumber157.
    • CommentAuthorUrs
    • CommentTimeMar 25th 2021

    with this quote:

    With the recent updates [...][...] the case for new physics inrare B decays has been further strengthened. [...][...] Even if only the theoretically clean LFU observables [...][...] are considered, muon specific [[ Wilson coefficients for New Physics]] im prove over the Standard Model by Δ 2≃4.7σ\sqrt{\Delta^2} \simeq 4.7 \sigma.

    It looks like the floodgates are opening up now. Let’s see how much longer I can keep up with logging the development.

    diff, v180, current

    • CommentRowNumber158.
    • CommentAuthorUrs
    • CommentTimeMar 31st 2021

    Added pointer to today’s:

    with this quote:

    With the recent result [[ of LHCb ]], for the first time a single observable affected by negligible theoretical uncertainties exhibits a deviation from the SM exceeding the 3σ3 \sigma level. Equally striking is the overall coherence of the picture that emerges, especially in b→sℓ +ℓ −b \to s \ell^+ \ell^- −transitions. As we shall show in this paper, combining all the b→sℓ +ℓ −b \to s \ell^+ \ell^-−observables in a very conservative way, the significance of the New Physics (NP) hypothesis formulated in 2014–2015 of a purely left-handed LFU-violating contact interaction has now reached a significance of 4.6σ4.6 \sigma.

    […][\ldots] A more structural way of addressing the flavor structure of the model is the idea of implementing Pati-Salam unification

    diff, v183, current

    • CommentRowNumber159.
    • CommentAuthorUrs
    • CommentTimeApr 1st 2021

    added pointer to this little video with Gino Isidori giving his impression on the flavour anomalies:

    • Barbara Gallavotti, starring Gino Isidori, How Particle Physics Works: Episode II - The New Analysis, June 2019 (youtube)

    diff, v184, current

    • CommentRowNumber160.
    • CommentAuthorUrs
    • CommentTimeApr 1st 2021
    • (edited Apr 1st 2021)

    Textbook account:

    diff, v185, current

    • CommentRowNumber161.
    • CommentAuthorUrs
    • CommentTimeApr 2nd 2021

    I have given the section “Statistical significance” subsections “Updates in 2020”, “Updates in 2021” etc. and re-ordered a little, accordingly. Also expanded slightly.

    diff, v187, current

    • CommentRowNumber162.
    • CommentAuthorUrs
    • CommentTimeApr 6th 2021

    added pointer to the recent:

    diff, v188, current

    • CommentRowNumber163.
    • CommentAuthorUrs
    • CommentTimeApr 8th 2021

    added a table (here) produced by Patrick Koppenburg just the other day, which lists a bunch of current experiments/channels, all involving muons somehow, and all seemingly showing deviation from theoretical prediction

    diff, v190, current

    • CommentRowNumber164.
    • CommentAuthorUrs
    • CommentTimeApr 13th 2021

    added pointer to today’s

    • Davide Lancierini, Gino Isidori, Patrick Owen, Nicola Serra, On the significance of new physics in b→sℓ +ℓ −b \to s \ell^+ \ell^- decays (arXiv:2104.05631)

    which claims to do a new and more careful analysis of the global statistical significance of the flavour anomalies (and finds 3.9σ3.9 \sigma)

    diff, v191, current

    • CommentRowNumber165.
    • CommentAuthorUrs
    • CommentTimeApr 14th 2021

    added pointer to

    • David Marzocca, Sokratis Trifinopoulos, A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabbibo Angle (arXiv:2104.05730)

    with this quote:

    the combined significance of the deviation reaches 4.7σ4.7\sigma. Furthermore,taking into account also less theoretically-clean observables […][\ldots] the overall significance of the deviations in this channel is raised to even above 6σ6\sigma, depending on the specific SM prediction employed

    diff, v192, current

    • CommentRowNumber166.
    • CommentAuthorUrs
    • CommentTimeMay 12th 2021

    added pointer to today’s

    • Jorge Alda, Jaume Guasch, Siannah Penaranda, Anomalies in B mesons decays: Present status and future collider prospects (arXiv:2105.05095)

    diff, v198, current

    • CommentRowNumber167.
    • CommentAuthorUrs
    • CommentTimeMay 17th 2021
    • (edited May 17th 2021)

    added pointer to today’s

    • We-Fu Chang, One colorful resolution to the neutrino mass generation, three lepton flavor universality anomalies, and the Cabibbo angle anomaly (arXiv:2105.06917)

    with this quote:

    From the global fits to various b→sl +l −b \to s l^+ l^-−data, the discrepancy is more than 5σ5\sigma from the SM predictions. The new result (59) further strengthens the lepton flavor universality violation. This anomaly alone convincingly indicates New Physics

    diff, v199, current

    • CommentRowNumber168.
    • CommentAuthorUrs
    • CommentTimeMay 17th 2021

    Added pointer to today’s

    • Joe Davighi, Anomalous Z′Z' bosons for anomalous B decays (arXivL2105.06918)

    including this quote:

    A highly conservative method for combining the various b→sℓℓb \to s \ell \ell anomalies, including the look-elsewhere effect, estimates their global significance to be 3.9σ. The combined set of discrepancies are by and large self-consistent with a common new physics origin involving muons.

    diff, v199, current

    • CommentRowNumber169.
    • CommentAuthorUrs
    • CommentTimeMay 28th 2021

    The other day I had added pointer to these recent slides:

    which give a more comprehensive/pedagogical discussion than usual

    diff, v201, current

    • CommentRowNumber170.
    • CommentAuthorUrs
    • CommentTimeJul 15th 2021

    added pointer to today’s

    diff, v205, current

    • CommentRowNumber171.
    • CommentAuthorUrs
    • CommentTimeAug 31st 2021

    added pointer to today’s

    • {#GengEtAl21} Li-Sheng Geng, Benjamín Grinstein, Sebastian Jäger, Shuang-Yi Li, Jorge Martin Camalich, Rui-Xiang Shi, Implications of new evidence for lepton-universality violation in b→sℓ +ℓ −b \to s \ell^+ \ell^- decays (arXiv:2103.12738)

    with this quote, from the abstract:

    Motivated by [⋯][\cdots] LHCb’s new measurements [⋯][\cdots] we quantify the combined level of discrepancy with the Standard Model and fit values of short-distance Wilson coefficients. A combination of the clean observables R KR_K, R K *R_{K^\ast}, and B s→μμB_s \to \mu \mu alone results in a discrepancy with the Standard Model at 4.0σ4.0 \sigma, up from 3.5σ3.5 \sigma in 2017. One-parameter scenarios with purely left-handed or with purely axial coupling to muons fit the data well and result in a ∼5σ\sim 5 \sigma pull from the Standard Model.

    diff, v206, current

    • CommentRowNumber172.
    • CommentAuthorUrs
    • CommentTimeSep 16th 2021

    added pointer to today’s:

    • Disha Bhatia, Nishita Desai, Amol Dighe, Frugal U(1) XU(1)_X models with non-minimal flavor violation for b→sℓℓb \to s \ell \ell anomalies and neutrino mixing* (arXiv:2109.07093)

    diff, v208, current

    • CommentRowNumber173.
    • CommentAuthorUrs
    • CommentTimeOct 2nd 2021

    added this pointer

    with a link to a recent talk by Isidori (here)

    diff, v209, current

    • CommentRowNumber174.
    • CommentAuthorUrs
    • CommentTimeOct 19th 2021
    • (edited Oct 19th 2021)

    added pointer to today’s new measurement result:

    • LHCb collaboration Tests of lepton universality using B 0→K S 0l +l −B^0 \to K^0_S l^+ l^-− and B +→K *ℓ +ℓ −B^+ \to K^\ast \ell^+ \ell^- decays (arXiv:2110.09501)

    (Apparently it’s another but small addition to the emerging pattern, see here. Though from this graphics it looks rather convincing.)

    diff, v210, current

    • CommentRowNumber175.
    • CommentAuthorUrs
    • CommentTimeOct 20th 2021

    added to the Introduction (here) a paragraph on the branching ratios being “clean observables”

    diff, v211, current

    • CommentRowNumber176.
    • CommentAuthorUrs
    • CommentTimeOct 27th 2021

    added pointer to today’s

    • David London, Joaquim Matias, BB Flavour Anomalies: 2021 Theoretical Status Report (arXiv:2110.13270)

    diff, v216, current

    • CommentRowNumber177.
    • CommentAuthorUrs
    • CommentTimeMar 12th 2022
    • (edited Mar 12th 2022)

    For when the editing functionality is back, to add these pointers:

    Some days ago, Isidori et al. further strengthened their claim that the flavour anomalies point to a Randall-Sundrum model with 3-branes:

    • Javier Fuentes-Martin, Gino Isidori, Javier M. Lizana, Nudzeim Selimovic, Ben A. Stefanek, Flavor hierarchies, flavor anomalies, and Higgs mass from a warped extra dimension (arXiv:2203.01952)

    highlighted again today in the review:

    (Noteworthy that these authors are not string theorists but pure HEP phenomenologists. They just went for the best fit of the data seen in the flavour anomalies.)

    • CommentRowNumber178.
    • CommentAuthorUrs
    • CommentTimeMay 9th 2022

    Luckily today

    • Alessandra D’Alise et al., Standard model anomalies: Lepton flavour non-universality, g-2 and W-mass [[arXiv:2204.03686]]

    was updated, which reminded me to include it. Added the following quote (here)

    We critically analyze the body of results that hints to the existence of New Physics from possible violations of lepton universality observed by the LHCb experiment. [⋯][\cdots] the deviations from the Standard Model are at the 4.7σ level when including only the hadronic insensitive observables while it increases to 6.1σ when including also the hadronic sensitive ones.

    [...][...] Scalar leptoquarks, either a singlet or a doublet of weak interactions, can explain all the anomalies.

    diff, v218, current

    • CommentRowNumber179.
    • CommentAuthorUrs
    • CommentTimeMay 15th 2022
    • (edited May 15th 2022)

    added pointer to this new textbook:

    (though it doesn’t seem really published/available yet)

    diff, v219, current

    • CommentRowNumber180.
    • CommentAuthorUrs
    • CommentTimeJul 6th 2022

    added pointer to today’s review:

    together with this quote (from the abstract):

    The main final message is that all the instruments necessary to fully establish the putative new effects are at hand, thanks to running experiments and their upgrades. Therefore this subject stands concrete chances to usher genuinely unexpected discoveries.

    diff, v220, current

    • CommentRowNumber181.
    • CommentAuthorUrs
    • CommentTimeJul 18th 2022
    • (edited Jul 18th 2022)

    added pointer to today’s review:

    (no real news, except that the picture remains – reference to experimental hint for GUTs now commonplace)

    diff, v221, current

    • CommentRowNumber182.
    • CommentAuthorUrs
    • CommentTimeAug 8th 2022
    • (edited Aug 8th 2022)

    added pointer to

    • Marcel Algueró, Andreas Crivellin, Claudio Andrea Manzari, Joaquim Matias, Unified Explanation of the Anomalies in Semi-Leptonic BB decays and the WW Mass, Physical Review D (2022) [arXiv:2201.08170]

    (which was updated on the arXiv today) and added (under “Updates in 2022”, here) this quote:

    when combining all tests of LFUV (like R K +R_{K^+} ) with BB decays involving muon pairs […], one finds a preference for new physics (NP) hypotheses of more than 7σ compared to the SM. Note that such a high significance is only possible since all measurements are compatible with each other, i.e. they form a coherent picture

    diff, v222, current

    • CommentRowNumber183.
    • CommentAuthorUrs
    • CommentTimeAug 8th 2022

    have re-organized the entry slightly: Moved the references/quotes on statistical signifcance across all channels out of the section “Status and Outlook” and into the section “Statistical significance”.

    diff, v222, current

    • CommentRowNumber184.
    • CommentAuthorUrs
    • CommentTimeAug 8th 2022

    also added (under “Relation to other anomalies” here) the following remark:

    In ACMM22 it is argued (see footnote 3) that also the huge anomaly reported by CDF collaboration 2022 in the mass of the W-boson is compatible with (in fact predicted by) the BB-meson decay anomalies.

    diff, v222, current

    • CommentRowNumber185.
    • CommentAuthorUrs
    • CommentTimeAug 11th 2022

    almost missed this announcement when being on vacation:

    • W. G. Parrott, C. Bouchard, C. T. H. Davies, Standard Model predictions for B→Kℓ +ℓ −B \to K \ell^+ \ell^-, B→Kℓ 1 −ℓ 2 +B \to K \ell^-_1 \ell^+_2 and B→Kνν¯B \to K \nu \bar\nu using form factors from Nf=2+1+1 lattice QCD [arXiv:2207.13371]

    have added the pointer now, together with this quote:

    We have used our improved scalar, vector and tensor form factors calculated in N f=2+1+1N_f = 2+1+1 lattice QCD […] Our improved form factors significantly sharpen the tension, which becomes particularly strong in the region below the charmonium resonances. For 1.1<q 2<6GeV 21.1 \lt q^2 \lt 6 GeV^2 we find a tension of 4.7σ for B +→K +μ +μ −B^+ \to K^+ \mu^+ \mu^- and 3.6σ for B 0→K +μ +μ −B^0 \to K^+ \mu^+ \mu^- with LHCb ’14A and 3.3σ for B +→K +e +e −B^+ \to K^+ e^+ e^- with LHCb ’21

    So that’s now 4.7σ4.7 \sigma in a single channel.

    diff, v223, current

    • CommentRowNumber186.
    • CommentAuthorUrs
    • CommentTimeAug 12th 2022
    • (edited Aug 12th 2022)

    added pointer to today’s

    together with this quote:

    The updated NP fits to rare B decays […] follow the same trend as with the previous set of results favouring in particular new physics contributions in the Wilson coefficient C 9 μC^\mu_9, with an increased significance. […] The projections for clean observables, show that if the current tensions remain, R KR_K can establish NP with 5σ significance already with less than 20 fb −1fb^{-1} of data. The main source of theory uncertainty in global fits is due to non-local hadronic contributions. However, different fits with different setups, inputs and statistical frameworks show a remarkable agreement so that the experimental observation of the discrepancy in these observables would be a clear sign of physics beyond the SM.

    diff, v224, current

    • CommentRowNumber187.
    • CommentAuthorUrs
    • CommentTimeSep 2nd 2022

    added pointer to today’s

    • Mario Fernández Navarro, Stephen F. King, BB-anomalies in a twin Pati-Salam theory of flavour [arXiv:2209.00276]

    diff, v225, current

    • CommentRowNumber188.
    • CommentAuthorUrs
    • CommentTimeOct 19th 2022
    • (edited Oct 19th 2022)

    added pointer to yesterday’s new measurement announcement by LHCb:

    • Gregory Max Ciezarek on behalf of the LHCb collaboration: First joint measurement of R(D *)R(D^\ast) and R(D 0)R(D^0) at LHCb, LHC seminar (2022) [indico:1187939, slides: pdf]

    (upshot: previous analyses of the flavour anomaly in the R(D)R(D)-channel confirmed)

    diff, v227, current

    • CommentRowNumber189.
    • CommentAuthorUrs
    • CommentTimeOct 21st 2022

    added pointer to today’s

    • W. G. Parrott, C. Bouchard, C. T. H. Davies, The search for new physics in B→Kℓ +ℓ −B \to K \ell^+ \ell^- and B→Kν +ν −B \to K \nu^+ \nu^- using precise lattice QCD form factors [arXiv:2210.10898]

    together with this quote from their conclusion:

    We present the first fully relativistic determination of the scalar, vector and tensor form factors for B→KB \to K decays. […] Using these form factors, we can calculate the SM branching fraction for B→Ke(μ)+e(μ) −B \to K e(\mu)+ e(\mu)^- […] We find tensions above 3σ3\sigma in the ratio of our result with LHCb, and above 5σ5\sigma in one instance for the low q 2q^2 bin.

    diff, v228, current

    • CommentRowNumber190.
    • CommentAuthorUrs
    • CommentTimeNov 1st 2022
    • (edited Nov 1st 2022)

    added pointer to:

    • Syuhei Iguro, Teppei Kitahara, Ryoutaro Watanabe, Global fit to b→cτνb \to c \tau \nu anomalies 2022 mid-autumn [arXiv:2210.10751]

    together with quotes (here) of the new σ\sigmas they state in their conclusions:

    present data deviates from the SM predictions at 4.3σ

    diff, v230, current

    • CommentRowNumber191.
    • CommentAuthorUrs
    • CommentTimeNov 1st 2022

    also added pointer to:

    • Jason Aebischer, Gino Isidori, Marko Pesut, Ben A. Stefanek, Felix Wilsch, Confronting the vector leptoquark hypothesis with new low- and high-energy data [arXiv:2210.13422]

    diff, v230, current

    • CommentRowNumber192.
    • CommentAuthorUrs
    • CommentTimeNov 14th 2022

    added pointer to today’s

    • Amarjit Soni, Precision tau physics: Challenge for Theory, on and off the lattice [arXiv:2211.05839]

    together with a quote of the first couple of paragraphs

    diff, v231, current

    • CommentRowNumber193.
    • CommentAuthorUrs
    • CommentTimeNov 24th 2022

    added pointer to today’s

    • Ashutosh Kotwal, Joaquim Matias, Andrea Mauri, Tom Tong, Lukas Varnhorst, Round table on Standard Model Anomalies [arXiv:2211.13030]

    diff, v232, current

    • CommentRowNumber194.
    • CommentAuthorUrs
    • CommentTimeDec 20th 2022
    • (edited Dec 20th 2022)

    added pointer to the recent:

    • LHCb collaboration, Measurement of lepton universality parameters in B +→K +ℓ +ℓ −B^+ \to K^+ \ell^+ \ell^- and B 0→K *0ℓ +ℓ −B^0 \to K^{\ast 0} \ell^+ \ell^- decays [arXiv:2212.09153]

    which claims that re-analysis of hadronic backgrounds in kaonic decays makes the decay rate in the electron channel go down, so that the ratio R KR_K, R K *R_{K^\ast} over the corresponding muon channel is accurately described by the standard model (cf. A. Maas, 20 Dec 2022).

    diff, v233, current

    • CommentRowNumber195.
    • CommentAuthorUrs
    • CommentTimeDec 20th 2022

    This here is more explicit:

    diff, v234, current

    • CommentRowNumber196.
    • CommentAuthorUrs
    • CommentTimeDec 21st 2022
    • (edited Dec 21st 2022)

    added pointer to today’s

    • Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca Silvestrini, Mauro Valli, Constraints on Lepton Universality Violation from Rare B Decays [arXiv:2212.10516]

    who accordingly conclude:

    that current data no longer provide strong hints for NP.

    I have linked to this from a new subsection Fixing the backgrounds.

    But it looks like it’s time to close this thread. Sorry for all the noise.

    (I was prepared to eventually be disappointed. But the way this ends up being disappointing is itself disappointing.)

    diff, v235, current

    • CommentRowNumber197.
    • CommentAuthorUrs
    • CommentTimeDec 21st 2022

    added a warning box at the top of the entry

    diff, v235, current

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