Measurements of B→J/ψ at forward rapidity in p+p collisions at √s=510 GeV

Aidala, C. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2017) Measurements of B→J/ψ at forward rapidity in p+p collisions at √s=510 GeV. Physical Review D, 95 (9). pp. 92002-18. ISSN 1550-7998

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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+1.92−1.70 μb. It is consistent with the fixed-order-next-to-leading-logarithm calculations.

Item Type: Article
Date: 2 May 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 American Physical Society. Received 6 January 2017. Published 2 May 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 29 Sep 2017 13:45
Last Modified: 29 Sep 2017 13:46

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