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https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00041461
2022-08-01T05:52:52Z
117:5003
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3:62:5598:84
Measurements of B→J/ψ at forward rapidity in p+p collisions at √s=510 GeV
PHENI Collaboration
Chujo, T.
中條, 達也
チュウジョウ, タツヤ
Esumi, S.
江角, 晋一
エスミ, シンイチ
Miake, Y.
三明, 康郎
ミアケ, ヤスオ
open access
(c) 2017 American Physical Society
We report the first measurement of the fraction of J/ψ mesons coming from B-meson decay (FB→J/ψ) in p+p collisions at √s=510 GeV. The measurement is performed using the forward silicon vertex detector and central vertex detector at PHENIX, which provide precise tracking and distance-of-closest-approach determinations, enabling the statistical separation of J/ψ due to B-meson decays from prompt J/ψ. The measured value of FB→J/ψ is 8.1%±2.3%(stat)±1.9%(syst) for J/ψ with transverse momenta 0<pT<5 GeV/c and rapidity 1.2<|y|<2.2. The measured fraction FB→J/ψ at PHENIX is compared to values measured by other experiments at higher center of mass energies and to fixed-order-next-to-leading-logarithm and color-evaporation-model predictions. The b ̄b cross section per unit rapidity [dσ/dy(pp→b ̄b)] extracted from the obtained FB→J/ψ and the PHENIX inclusive J/ψ cross section measured at 200 GeV scaled with color-evaporation-model calculations, at the mean B hadron rapidity y=±1.7 in 510 GeV p+p collisions, is 3.63_(-1.70)^(+1.92) μb. It is consistent with the fixed-order-next-to-leading-logarithm calculations.
American Physical Society
2017
eng
journal article
VoR
http://hdl.handle.net/2241/00146403
https://tsukuba.repo.nii.ac.jp/records/41461
https://doi.org/10.1103/PhysRevD.95.092002
2470-0010
AA00773624
Physical review D
95
9
92002
https://tsukuba.repo.nii.ac.jp/record/41461/files/PRD_95-092002.pdf
application/pdf
1.5 MB
2017-06-07