Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Measurements of Born cross sections for e+e−→Λc+Λ¯c(2595)−+c.c. and e+e−→Λc+Λ¯c(2625)−+c.c. at s=4918.0 and 4950.9 MeV. / The BESIII Collaboration ; Николаев, Иван Борисович; Мучной, Николай Юрьевич.
в: Physical Review D, Том 109, № 7, L071104, 30.04.2024.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Measurements of Born cross sections for e+e−→Λc+Λ¯c(2595)−+c.c. and e+e−→Λc+Λ¯c(2625)−+c.c. at s=4918.0 and 4950.9 MeV
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. n.
AU - Adlarson, P.
AU - Afedulidis, O.
AU - Ai, X. c.
AU - Aliberti, R.
AU - Amoroso, A.
AU - An, Q.
AU - Bai, Y.
AU - Bakina, O.
AU - Balossino, I.
AU - Ban, Y.
AU - Bao, H.-R.
AU - Batozskaya, V.
AU - Begzsuren, K.
AU - Berger, N.
AU - Berlowski, M.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bianchi, F.
AU - Bianco, E.
AU - Bortone, A.
AU - Briere, R. a.
AU - Brueggemann, A.
AU - Cai, H.
AU - Cai, X.
AU - Николаев, Иван Борисович
AU - Мучной, Николай Юрьевич
PY - 2024/4/30
Y1 - 2024/4/30
N2 - Using e+e- collision data collected with the BESIII detector operating at the BEPCII collider, the Born cross sections of e+e-→Λc+Λ¯c(2595)-+c.c. and e+e-→Λc+Λ¯c(2625)-+c.c. are measured for the first time at center-of-mass energies of s=4918.0 and 4950.9 MeV. Nonzero cross sections are observed very close to the production threshold. The measured Born cross sections of e+e-→Λc+Λ¯c(2625)-+c.c. are about 2-3 times greater than those of e+e-→Λc+Λ¯c(2595)-+c.c., providing the similar behavior as semileptonic decays of Λb0, but different behavior from that in the hadronic decays of Λb0. The Born cross sections are 15.6±3.1±0.9 pb and 29.4±3.7±2.7 pb for e+e-→Λc+Λ¯c(2595)-+c.c., and are 43.4±4.0±4.1 pb and 76.8±6.5±4.2 pb for e+e-→Λc+Λ¯c(2625)-+c.c. at s=4918.0 and 4950.9 MeV, respectively. Based on the polar angle distributions of the Λ¯c(2625)- and Λc(2625)+, the form-factor ratios |GE|2+3|GM|2/|GC| are determined for e+e-→Λc+Λ¯c(2625)-+c.c. for the first time, which are 5.95±4.07±0.15 and 0.94±0.32±0.02 at s=4918.0 and 4950.9 MeV, respectively. All of these first uncertainties are statistical and second systematic.
AB - Using e+e- collision data collected with the BESIII detector operating at the BEPCII collider, the Born cross sections of e+e-→Λc+Λ¯c(2595)-+c.c. and e+e-→Λc+Λ¯c(2625)-+c.c. are measured for the first time at center-of-mass energies of s=4918.0 and 4950.9 MeV. Nonzero cross sections are observed very close to the production threshold. The measured Born cross sections of e+e-→Λc+Λ¯c(2625)-+c.c. are about 2-3 times greater than those of e+e-→Λc+Λ¯c(2595)-+c.c., providing the similar behavior as semileptonic decays of Λb0, but different behavior from that in the hadronic decays of Λb0. The Born cross sections are 15.6±3.1±0.9 pb and 29.4±3.7±2.7 pb for e+e-→Λc+Λ¯c(2595)-+c.c., and are 43.4±4.0±4.1 pb and 76.8±6.5±4.2 pb for e+e-→Λc+Λ¯c(2625)-+c.c. at s=4918.0 and 4950.9 MeV, respectively. Based on the polar angle distributions of the Λ¯c(2625)- and Λc(2625)+, the form-factor ratios |GE|2+3|GM|2/|GC| are determined for e+e-→Λc+Λ¯c(2625)-+c.c. for the first time, which are 5.95±4.07±0.15 and 0.94±0.32±0.02 at s=4918.0 and 4950.9 MeV, respectively. All of these first uncertainties are statistical and second systematic.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85192144604&origin=inward&txGid=4a6aa341a380a692a91883b869bdd63e
U2 - 10.1103/PhysRevD.109.L071104
DO - 10.1103/PhysRevD.109.L071104
M3 - Article
VL - 109
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 7
M1 - L071104
ER -
ID: 62715558