Measurements of B -> J/psi at forward rapidity in p plus p collisions at root s=510 GeV

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2017-05-02
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Aidala, C.
Apadula, Nicole
Campbell, Sarah
Ding, Lei
Hill, John
Hotvedt, Nels
Lajoie, John
Lebedev, Alexandre
Ogilvie, Craig
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Ogilvie, Craig
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Physics and Astronomy
Abstract

We report the first measurement of the fraction of J/psi mesons coming from B-meson decay (F (B -> J/psi)) in p + p collisions at root 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=. due to B-meson decays from prompt J/psi. The measured value of F (B -> J/psi) is 8.1% +/- 2.3% (stat) +/- 1.9% (syst) for J/psi with transverse momenta 0 < p(T) < 5 GeV/c and rapidity 1.2 < vertical bar y vertical bar < 2.2. The measured fraction F (B -> J/psi) at PHENIX is compared to values measured by other experiments at higher center of mass energies and to fixed-order-next-toleading- logarithm and color-evaporation-model predictions. The b (b) over bar cross section per unit rapidity [d sigma/dy(pp -> b (b) over bar)] extracted from the obtained F (B -> 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 = +/- 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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This is an article from Physical Review D 95 (2017): 092002-1, doi:10.1103/PhysRevD.95.092002. Posted with permission.

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Sun Jan 01 00:00:00 UTC 2017
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