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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeMar 20th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexbeginning to record some references -- but nothing else here yet <a href="https://ncatlab.org/nlab/revision/%CF%83-meson/1">v1</a>, <a href="https://ncatlab.org/nlab/show/%CF%83-meson">current</a>

   beginning to record some references – but nothing else here yet

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeMar 25th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded a few more pointers: * J. R. Pelaez, _From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance_, Physics Reports 658 (2016) 1 ([arXiv:1510.00653](https://arxiv.org/abs/1510.00653)) * S. S. Afonin, T. D. Solomko, _The sigma meson from QCD sum rules for large-$N_c$ Regge spectra_, Eur. Phys. J. C 76, 678 (2016) ([arXiv:1608.08131](https://arxiv.org/abs/1608.08131)) * S. S. Afonin, T. D. Solomko, _The linear radial spectrum of scalar mesons within the QCD sum rules in the planar limit_, Eur. Phys. J. C 76, 678 (2016) ([arXiv:1608.08131](https://arxiv.org/abs/1608.08131)) Discussion in [[holographic QCD]]: On [[sigma-mesons]] and [[omega-mesons]] mediating [[baryon]] [[interaction]], discussed in [[holographic QCD]] via [[D3-D7 brane intersections]]: * Anatoly Dymarsky, Dmitry Melnikov, [[Jacob Sonnenschein]], _Attractive Holographic Baryons_, JHEP 06 (2011) 145 ([arXiv:1012.1616](https://arxiv.org/abs/1012.1616)) <a href="https://ncatlab.org/nlab/revision/diff/%CF%83-meson/2">diff</a>, <a href="https://ncatlab.org/nlab/revision/%CF%83-meson/2">v2</a>, <a href="https://ncatlab.org/nlab/show/%CF%83-meson">current</a>

   added a few more pointers:

   • J. R. Pelaez, From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance, Physics Reports 658 (2016) 1 (arXiv:1510.00653)

   • S. S. Afonin, T. D. Solomko, The sigma meson from QCD sum rules for large-$N_c$ Regge spectra, Eur. Phys. J. C 76, 678 (2016) (arXiv:1608.08131)

   • S. S. Afonin, T. D. Solomko, The linear radial spectrum of scalar mesons within the QCD sum rules in the planar limit, Eur. Phys. J. C 76, 678 (2016) (arXiv:1608.08131)

   Discussion in holographic QCD:

   On sigma-mesons and omega-mesons mediating baryon interaction, discussed in holographic QCD via D3-D7 brane intersections:

   • Anatoly Dymarsky, Dmitry Melnikov, Jacob Sonnenschein, Attractive Holographic Baryons, JHEP 06 (2011) 145 (arXiv:1012.1616)

   diff, v2, current

3. • CommentRowNumber3.
   • CommentAuthorDavid_Corfield
   • CommentTimeMar 25th 2020
   • PermaLink
   Author: David_Corfield
   Format: MarkdownItexWhy does $\sigma$-meson not feature on the [[meson]] page?

   Why does $\sigma$-meson not feature on the meson page?

4. • CommentRowNumber4.
   • CommentAuthorUrs
   • CommentTimeMar 25th 2020
   • (edited Mar 25th 2020)
   • PermaLink
   Author: Urs
   Format: MarkdownItexThe sigma is a curious thing. Not evidently part of the quark model (!) The review * J. R. Pelaez, _From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance_, Physics Reports 658 (2016) 1 ([arXiv:1510.00653](https://arxiv.org/abs/1510.00653)) has the word "confusing" appear 22 times. But at the very least I can add it to the top left of the table of Lorentz/isospin representations. Will do.

   The sigma is a curious thing. Not evidently part of the quark model (!) The review

   • J. R. Pelaez, From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance, Physics Reports 658 (2016) 1 (arXiv:1510.00653)

   has the word “confusing” appear 22 times.

   But at the very least I can add it to the top left of the table of Lorentz/isospin representations. Will do.

5. • CommentRowNumber5.
   • CommentAuthorDavid_Corfield
   • CommentTimeMar 25th 2020
   • PermaLink
   Author: David_Corfield
   Format: MarkdownItexHa, 22! About 20 'controversy/-ial's too.

   Ha, 22! About 20 ’controversy/-ial’s too.

6. • CommentRowNumber6.
   • CommentAuthorUrs
   • CommentTimeMar 25th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexEven with the $\sigma$ being elusive, it seems be be uncontroversial that "it" provides the main contribution of the nuclear force between hadrons. It's quite remarkable how many and how basic open questions are being swept under the rug by pretending that "QCD explains nuclear physics".

   Even with the $\sigma$ being elusive, it seems be be uncontroversial that “it” provides the main contribution of the nuclear force between hadrons.

   It’s quite remarkable how many and how basic open questions are being swept under the rug by pretending that “QCD explains nuclear physics”.

7. • CommentRowNumber7.
   • CommentAuthorUrs
   • CommentTimeApr 9th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexhave now added the rep-theory table of mesons, with the sigma included (typeset in parenthesis...) <a href="https://ncatlab.org/nlab/revision/diff/%CF%83-meson/8">diff</a>, <a href="https://ncatlab.org/nlab/revision/%CF%83-meson/8">v8</a>, <a href="https://ncatlab.org/nlab/show/%CF%83-meson">current</a>

   have now added the rep-theory table of mesons, with the sigma included (typeset in parenthesis…)

   diff, v8, current

8. • CommentRowNumber8.
   • CommentAuthorUrs
   • CommentTimeApr 21st 2020
   • (edited Apr 21st 2020)
   • PermaLink
   Author: Urs
   Format: MarkdownItexI'll fix the table: the sigma-meson is a Lorentz scalar, not pseudo-scalar. <a href="https://ncatlab.org/nlab/revision/diff/%CF%83-meson/9">diff</a>, <a href="https://ncatlab.org/nlab/revision/%CF%83-meson/9">v9</a>, <a href="https://ncatlab.org/nlab/show/%CF%83-meson">current</a>

   I’ll fix the table: the sigma-meson is a Lorentz scalar, not pseudo-scalar.

   diff, v9, current

9. • CommentRowNumber9.
   • CommentAuthorUrs
   • CommentTimeSep 18th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's * Christian S. Fischer, Paul C. Wallbott, Richard Williams, Nico Santowsky, Gernot Eichmann, _The $\sigma$-meson: four-quark vs. two-quark components and decay width in a Bethe-Salpeter approach_ ([arXiv:2007.06495](https://arxiv.org/abs/2007.06495)) <a href="https://ncatlab.org/nlab/revision/diff/%CF%83-meson/13">diff</a>, <a href="https://ncatlab.org/nlab/revision/%CF%83-meson/13">v13</a>, <a href="https://ncatlab.org/nlab/show/%CF%83-meson">current</a>

   added pointer to today’s

   • Christian S. Fischer, Paul C. Wallbott, Richard Williams, Nico Santowsky, Gernot Eichmann, The $\sigma$-meson: four-quark vs. two-quark components and decay width in a Bethe-Salpeter approach (arXiv:2007.06495)

   diff, v13, current