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

Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Alexander, J J; Alfred, M.; Aoki, K.; Apadula, N; Asano, H. and Atomssa, E. T., et al. (2017) In Physical Review D - Particles, Fields, Gravitation and Cosmology 95(9).
Abstract

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... (More)

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 bb cross section per unit rapidity [dσ/dy(pp→bb)] 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.

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Physical Review D - Particles, Fields, Gravitation and Cosmology
volume
95
issue
9
publisher
American Physical Society
external identifiers
  • scopus:85020126352
  • wos:000400668700002
ISSN
2470-0010
DOI
10.1103/PhysRevD.95.092002
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English
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e7f6f96e-c7ca-4699-bdf3-8e4159135f63
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@article{e7f6f96e-c7ca-4699-bdf3-8e4159135f63,
  abstract     = {<p>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&lt;pT&lt;5 GeV/c and rapidity 1.2&lt;|y|&lt;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 bb cross section per unit rapidity [dσ/dy(pp→bb)] 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.</p>},
  articleno    = {092002},
  author       = {Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Alexander, J J and Alfred, M. and Aoki, K. and Apadula, N and Asano, H. and Atomssa, E. T. and Attila, A. and Awes, T. C. and Ayuso, Carmen and Azmoun, B. and Babintsev, V. and Bai, M and Bai, X. and Bannier, B and Barish, K N and Bathe, S and Baublis, V. and Baumann, C. and Baumgart, S. and Bazilevsky, A and Beaumier, M. and Belmont, R and Berdnikov, A and Berdnikov, Y. and Black, D and Blau, D. S. and Boer, M. and Bok, J S and Boyle, K and Brooks, M L and Bryslawskyj, J. and Buesching, H and Bumazhnov, V. and Butler, Christopher C. and Butsyk, S. and Campbell, S. and Canoaroman, C. and Chen, C. H. and Chi, C Y and Chiu, M and Choi, I J and Choi, J B and Christiansen, P. and Oskarsson, A. and Silvermyr, D. and Stenlund, E. and , },
  issn         = {2470-0010},
  language     = {eng},
  month        = {05},
  number       = {9},
  publisher    = {American Physical Society},
  series       = {Physical Review D - Particles, Fields, Gravitation and Cosmology},
  title        = {Measurements of B →j /ψ at forward rapidity in p+p collisions at s =510 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevD.95.092002},
  volume       = {95},
  year         = {2017},
}