Measurements of Σ+ and Σ− time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV

BESIII Collaboration

doi:10.1016/j.physletb.2021.136110

Measurements of Σ⁺ and Σ⁻ time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV

BESIII Collaboration

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Abstract

The Born cross sections of the e⁺e⁻→Σ⁺Σ¯⁻ and e⁺e⁻→Σ⁻Σ¯⁺ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the Σ⁺ and Σ⁻ is consistent with 3. In addition, ratios of the Σ⁺ electric and magnetic form factors, |G_E/G_M|, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the Σ^± form factors require more theoretical discussions for the hyperons.

Original language	English (US)
Article number	136110
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	814
DOIs	https://doi.org/10.1016/j.physletb.2021.136110
State	Published - Mar 10 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 The Author(s)

Keywords

BESIII
Cross section
Electromagnetic form factor
Σ hyperon

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@article{6c6a704232304d20bb13c7a30e1500a5,

title = "Measurements of Σ+ and Σ− time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV",

abstract = "The Born cross sections of the e+e−→Σ+Σ¯− and e+e−→Σ−Σ¯+ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the Σ+ and Σ− is consistent with 3. In addition, ratios of the Σ+ electric and magnetic form factors, |GE/GM|, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the Σ± form factors require more theoretical discussions for the hyperons.",

keywords = "BESIII, Cross section, Electromagnetic form factor, Σ hyperon",

author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and P. Adlarson and S. Ahmed and M. Albrecht and A. Amoroso and Q. An and Anita and Y. Bai and O. Bakina and {Baldini Ferroli}, R. and I. Balossino and Y. Ban and K. Begzsuren and Bennett, {J. V.} and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Biernat and J. Bloms and A. Bortone and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and A. Calcaterra and Cao, {G. F.} and N. Cao and Cetin, {S. A.} and Chang, {J. F.} and Chang, {W. L.} and G. Chelkov and Chen, {D. Y.} and G. Chen and Chen, {H. S.} and Chen, {M. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and W. Cheng and G. Cibinetto and F. Cossio and Cui, {X. F.} and Dai, {H. L.} and Dai, {J. P.} and Dai, {X. C.} and A. Dbeyssi and {de Boer}, {R. B.} and H. Muramatsu",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s)",

year = "2021",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2021.136110",

language = "English (US)",

volume = "814",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

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TY - JOUR

T1 - Measurements of Σ+ and Σ− time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ahmed, S.

AU - Albrecht, M.

AU - Amoroso, A.

AU - An, Q.

AU - Anita,

AU - Bai, Y.

AU - Bakina, O.

AU - Baldini Ferroli, R.

AU - Balossino, I.

AU - Ban, Y.

AU - Begzsuren, K.

AU - Bennett, J. V.

AU - Berger, N.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Biernat, J.

AU - Bloms, J.

AU - Bortone, A.

AU - Boyko, I.

AU - Briere, R. A.

AU - Cai, H.

AU - Cai, X.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cao, N.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chang, W. L.

AU - Chelkov, G.

AU - Chen, D. Y.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, X. R.

AU - Chen, Y. B.

AU - Cheng, W.

AU - Cibinetto, G.

AU - Cossio, F.

AU - Cui, X. F.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dai, X. C.

AU - Dbeyssi, A.

AU - de Boer, R. B.

AU - Muramatsu, H.

PY - 2021/3/10

Y1 - 2021/3/10

N2 - The Born cross sections of the e+e−→Σ+Σ¯− and e+e−→Σ−Σ¯+ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the Σ+ and Σ− is consistent with 3. In addition, ratios of the Σ+ electric and magnetic form factors, |GE/GM|, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the Σ± form factors require more theoretical discussions for the hyperons.

AB - The Born cross sections of the e+e−→Σ+Σ¯− and e+e−→Σ−Σ¯+ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the Σ+ and Σ− is consistent with 3. In addition, ratios of the Σ+ electric and magnetic form factors, |GE/GM|, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the Σ± form factors require more theoretical discussions for the hyperons.

KW - BESIII

KW - Cross section

KW - Electromagnetic form factor

KW - Σ hyperon

UR - http://www.scopus.com/inward/record.url?scp=85100453078&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85100453078&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2021.136110

DO - 10.1016/j.physletb.2021.136110

M3 - Article

AN - SCOPUS:85100453078

SN - 0370-2693

VL - 814

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 136110

ER -