Observation of a cross-section enhancement near mass threshold in e + e − → Λ Λ ¯

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, S.; Chen, S. J.; Chen, X.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fan, J. Z.; Fang, J.; Fang, S. S.; Fang, X.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. 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Y.; Li, T.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. N.; Li, X. Q.; Li, Y. B.; Li, Z. B.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Lin, D. X.; Liu, B.; Liu, B. J.; Liu, C. X.; Liu, D.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H. B.; Liu, H. H.; Liu, H. H.; Liu, H. M.; Liu, J.; Liu, J. B.; Liu, J. P.; Liu, J. Y.; Liu, K.; Liu, K. Y.; Liu, L. D.; Liu, P. L.; Liu, Q.; Liu, S. B.; Liu, X.; Liu, Y. B.; Liu, Y. Y.; Liu, Z. A.; Liu, Zhiqing; Loehner, H.; Long, Y. F.; Lou, X. C.; Lu, H. J.; Lu, J. G.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, T.; Luo, X. L.; Lyu, X. R.; Ma, F. C.; Ma, H. L.; Ma, L. L.; Ma, M. M.; Ma, Q. M.; Ma, T.; Ma, X. N.; Ma, X. Y.; Ma, Y. M.; Maas, F. E.; Maggiora, M.; Malik, Q. A.; Mao, Y. J.; Mao, Z. P.; Marcello, S.; Messchendorp, J. G.; Mezzadri, G.; Min, J.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales Morales, C.; Morello, G.; Muchnoi, N. Yu.; Muramatsu, H.; Musiol, P.; Nefedov, Y.; Nerling, F.; Nikolaev, I. 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doi:10.1103/PhysRevD.97.032013

Title: Observation of a cross-section enhancement near mass threshold in $e^{+} e^{-} \to Λ \bar{Λ}$

Journal Article · Wed Feb 28 00:00:00 EST 2018 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.97.032013· OSTI ID:1423156

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M. more »

The process $e^{+} e^{-} \to Λ \bar{Λ}$ is studied using data samples at √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 √s=2.2324 GeV, which is 1.0 MeV above the $Λ \bar{Λ}$ mass threshold, to be 305±$$45_{-36}^{+66}$$ pb, where the first uncertainty is statistical and the second systematic. The substantial cross section near threshold is significantly larger than that expected from theory, which predicts the cross section to vanish at threshold. The Born cross sections at √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 Λ are deduced.

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Research Organization:: George Washington Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0010504; SC-0010118; SC-0012069; SC0016583

OSTI ID:: 1423156

Alternate ID(s):: OSTI ID: 1440851

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 97 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 47 works

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First measurements of timelike form factors of the hyperons, $Λ^{0}$ , $Σ^{0}$ , $Σ^{+}$ , $Ξ^{0}$ , $Ξ^{-}$ , and $Ω^{-}$ , and evidence of diquark correlations Dobbs, S.; Tomaradze, A.; Xiao, T. Physics Letters B, Vol. 739 https://doi.org/10.1016/j.physletb.2014.10.025	journal	December 2014
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Study of the reaction e+e−→p in the total energy range 1925–2180 MeV Delcourt, B.; Derado, I.; Bertrand, J. L. Physics Letters B, Vol. 86, Issue 3-4 https://doi.org/10.1016/0370-2693(79)90864-5	journal	October 1979
A measurement of Bisello, D.; Limentani, S.; Nigro, M. Nuclear Physics B, Vol. 224, Issue 3 https://doi.org/10.1016/0550-3213(83)90381-4	journal	September 1983
Determination of the electric and magnetic form factors of the proton in the time-like region Bardin, G.; Burgun, G.; Calabrese, R. Nuclear Physics B, Vol. 411, Issue 1 https://doi.org/10.1016/0550-3213(94)90052-3	journal	January 1994
Design and construction of the BESIII detector Ablikim, M.; An, Z. H.; Bai, J. Z. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 614, Issue 3 https://doi.org/10.1016/j.nima.2009.12.050	journal	March 2010
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First measurements of timelike form factors of the hyperons, $Λ^{0}$ , $Σ^{0}$ , $Σ^{+}$ , $Ξ^{0}$ , $Ξ^{-}$ , and $Ω^{-}$ , and evidence of diquark correlations Dobbs, S.; Tomaradze, A.; Xiao, T. Physics Letters B, Vol. 739 https://doi.org/10.1016/j.physletb.2014.10.025	journal	December 2014
The electromagnetic form factors of the Λ in the timelike region Haidenbauer, J.; Meißner, U. -G. Physics Letters B, Vol. 761 https://doi.org/10.1016/j.physletb.2016.08.067	journal	October 2016
Proton electromagnetic form factors: Basic notions, present achievements and future perspectives Pacetti, Simone; Baldini Ferroli, Rinaldo; Tomasi-Gustafsson, Egle Physics Reports, Vol. 550-551 https://doi.org/10.1016/j.physrep.2014.09.005	journal	January 2015
Event generators at BESIII Rong-Gang, Ping Chinese Physics C, Vol. 32, Issue 8 https://doi.org/10.1088/1674-1137/32/8/001	journal	August 2008
Trigger efficiencies at BESIII Zhu, Kai; Liu, Zhen-An; Jin, Da-Peng Chinese Physics C, Vol. 34, Issue 12 https://doi.org/10.1088/1674-1137/34/12/001	journal	December 2010
An exclusive event generator for e ⁺ e ⁻ scan experiments Ping, Rong-Gang Chinese Physics C, Vol. 38, Issue 8 https://doi.org/10.1088/1674-1137/38/8/083001	journal	August 2014
Review of Particle Physics Olive, K. A. Chinese Physics C, Vol. 38, Issue 9 https://doi.org/10.1088/1674-1137/38/9/090001	journal	August 2014
Unexpected features of e+e- $ \rightarrow$ p $ \overline{{p}}$ and e+e- $ \rightarrow$ $ \Lambda$ $ \overline{{\Lambda}}$ cross-sections near threshold Baldini, R.; Pacetti, S.; Zallo, A. The European Physical Journal A, Vol. 39, Issue 3 https://doi.org/10.1140/epja/i2008-10716-1	journal	February 2009
Antiproton-nucleus electromagnetic annihilation as a way to access the proton timelike form factors Fonvieille, H.; Karmanov, V. A. The European Physical Journal A, Vol. 42, Issue 2 https://doi.org/10.1140/epja/i2009-10884-4	journal	October 2009
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