Open Access
Observation of a cross-section enhancement near mass threshold in
e + e − → Λ Λ ¯
M. ABLIKIM
,
M. N. ACHASOV
,
S. Ahmed
,
X. C. Ai
,
O. Albayrak
,
M Albrecht
,
M. Albrecht
,
D. J. Ambrose
,
A. Amoroso
,
F. F. An
,
Q. An
,
J. Z. BAI
,
O. Bakina
,
R. Baldini Ferroli
,
Y. BAN
,
D. W. Bennett
,
J V Bennett
,
N. Berger
,
M. Bertani
,
D. Bettoni
,
J. M. Bian
,
F Bianchi
,
E. Boger
,
I. Boyko
,
R. A. Briere
,
H. Cai
,
X Cai
,
O. Cakir
,
A. Calcaterra
,
G. F. Cao
,
S. A. Cetin
,
J. Chai
,
J. F. Chang
,
G. Chelkov
,
G. Chen
,
H. S. Chen
,
J. C. Chen
,
M L Chen
,
S. Chen
,
S J Chen
,
X. Chen
,
X. R. Chen
,
Y.-B. Chen
,
X. K. Chu
,
G. Cibinetto
,
H. L. Dai
,
J. P. Dai
,
A. Dbeyssi
,
D. Dedovich
,
Z. Y. DENG
,
A. DENIG
,
I. Denysenko
,
M. Destefanis
,
F. De Mori
,
Y. Ding
,
C. Dong
,
J. Dong
,
L. Y. Dong
,
M. Y. Dong
,
Z.L. Dou
,
S. X. DU
,
P. F. Duan
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J. Z. Fan
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J. Fang
,
S. S. Fang
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X. Fang
,
Y. Fang
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R. Farinelli
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L. Fava
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S. Fegan
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F. Feldbauer
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G. Felici
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C. Q. Feng
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E. Fioravanti
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M. FRITSCH
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C. D. FU
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B. C. Ke
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B. Kloss
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J. S. LANGE
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H. Leithoff
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J. B. LIU
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G. Zhao
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J. W. ZHAO
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Lei Zhao
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Ling Zhao
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M. G. ZHAO
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Publication type: Journal Article
Publication date: 2018-02-28
scimago Q1
wos Q1
SJR: 1.458
CiteScore: 9.0
Impact factor: 5.3
ISSN: 24700010, 24700029, 05562821, 10894918, 15507998, 15502368
Abstract
The process e(+)e(-) -> Lambda(Lambda) over bar is studied using data samples at root s = 2.2324, 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating at the BEPCII collider. The Born cross section is measured at root s = 2.2324 GeV, which is 1.0 MeVabove the Lambda(Lambda) over bar mass threshold, to be 305 +/- 45(-36)(+66) pb, where the first uncertainty is statistical and the second systematic. The cross section near threshold is larger than that expected from theory, which predicts the cross section to vanish at threshold. The Born cross sections at root s = 2.400, 2.800 and 3.080 GeV are measured and found to be consistent with previous experimental results, but with improved precision. Finally, the corresponding effective electromagnetic form factors of Lambda are deduced.
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ABLIKIM M. et al. Observation of a cross-section enhancement near mass threshold in e+e−→ΛΛ¯ // Physical Review D. 2018. Vol. 97. No. 3. 032013
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ABLIKIM M. et al. Observation of a cross-section enhancement near mass threshold in e+e−→ΛΛ¯ // Physical Review D. 2018. Vol. 97. No. 3. 032013
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@article{2018_ABLIKIM,
author = {M. ABLIKIM and M. N. ACHASOV and S. Ahmed and X. C. Ai and O. Albayrak and M Albrecht and M. Albrecht and D. J. Ambrose and A. Amoroso and F. F. An and Q. An and J. Z. BAI and O. Bakina and R. Baldini Ferroli and Y. BAN and D. W. Bennett and J V Bennett and N. Berger and M. Bertani and D. Bettoni and J. M. Bian and F Bianchi and E. Boger and I. Boyko and R. A. Briere and H. Cai and X Cai and O. Cakir and A. Calcaterra and G. F. Cao and S. A. Cetin and J. Chai and J. F. Chang and G. Chelkov and G. Chen and H. S. Chen and J. C. Chen and M L Chen and S. Chen and S J Chen and X. Chen and X. R. Chen and Y.-B. Chen and X. K. Chu and G. Cibinetto and H. L. Dai and J. P. Dai and A. Dbeyssi and D. Dedovich and Z. Y. DENG and others},
title = {Observation of a cross-section enhancement near mass threshold in e+e−→ΛΛ¯},
journal = {Physical Review D},
year = {2018},
volume = {97},
publisher = {American Physical Society (APS)},
month = {feb},
url = {https://doi.org/10.1103/PhysRevD.97.032013},
number = {3},
pages = {032013},
doi = {10.1103/PhysRevD.97.032013}
}
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