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Measurements of $$B to J/psi$$ at forward rapidity in $$p+p$$ collisions at $$sqrt{s}=510$$ GeV

$$sqrt{s}$$=510GeVでの陽子-陽子衝突における前方$$B to J/psi$$の測定

Aidala, C.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他425名*

Aidala, C.*; Hasegawa, Shoichi; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 425 of others*

We report the first measurement of the fraction of $$J/psi$$ mesons coming from $$B$$-meson decay ($$F_{B to J/psi}$$) in $$p+p$$ collisions at $$sqrt{s}=510$$ 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 $$J/psi$$ due to $$B$$-meson decays from prompt $$J/psi$$. The measured value of $$F_{B to J/psi}$$ is $$8.1% pm 2.3%{(rm stat)} pm1.9% {(rm syst)}$$ for $$J/psi$$ with transverse momenta $$0 < p_T < 5$$ GeV/$$c$$ and rapidity $$1.2<|y|<2.2$$. The measured fraction $$F_{B to J/psi}$$ 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 $$bbar{b}$$ cross section per unit rapidity $$[dsigma/dy(pp to bbar{b})]$$ extracted from the obtained $$F_{B to J/psi}$$ and the PHENIX inclusive $$J/psi$$ cross section measured at 200 GeV scaled with color-evaporation-model calculations, at the mean $$B$$ hadron rapidity $$y=pm 1.7$$ in 510 GeV $$p+p$$ collisions, is $$3.63_{-1.70}^{+1.92}$$ $$mu$$b. It is consistent with the fixed-order-next-to-leading-logarithm calculations.

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パーセンタイル:55.92

分野:Astronomy & Astrophysics

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