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論文

Measurements of $$mumu$$ pairs from open heavy flavor and Drell-Yan in $$p+p$$ collisions at $$sqrt{s}=200$$ GeV

Aidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他287名*

Physical Review D, 99(7), p.072003_1 - 072003_41, 2019/04

AA2019-0566.pdf:3.21MB

https://doi.org/10.1103/PhysRevD.99.072003
 被引用回数：15 パーセンタイル：65.63(Astronomy & Astrophysics)

PHENIX reports differential cross sections of $$mumu$$ pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in $$p$$$$+$$$$p$$ collisions at $$sqrt{s}=200$$ GeV at forward and backward rapidity ($$1.2 < |eta| < 2.2$$). The $$mumu$$ pairs from $$cbar{c}$$, $$bbar{b}$$, and Drell-Yan are separated using a simultaneous fit to unlike- and like-sign muon pair spectra in mass and $$p_T$$. The azimuthal opening angle correlation between the muons from $$cbar{c}$$ and $$bbar{b}$$ decays and the pair-$$p_T$$ distributions are compared to distributions generated using ${sc pythia}$ and ${sc powheg}$ models, which both include next-to-leading order processes. The measured distributions for pairs from $$cbar{c}$$ are consistent with ${sc pythia}$ calculations. The $$cbar{c}$$ data presents narrower azimuthal correlations and softer $$p_T$$ distributions compared to distributions generated from ${sc powheg}$. The $$bbar{b}$$ data are well described by both models. The extrapolated total cross section for bottom production is $$3.75{pm}0.24({rm stat}){pm}^{0.35}_{0.50}({rm syst}){pm}0.45({rm global})$$[$$mu$$b], which is consistent with previous measurements at the Relativistic Heavy Ion Collider in the same system at the same collision energy, and is approximately a factor of two higher than the central value calculated with theoretical models. The measured Drell-Yan cross section is in good agreement with next-to-leading-order quantum-chromodynamics calculations.

論文

Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in $$p+p$$ collisions at $$sqrt{s}=200$$ GeV

Aidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他287名*

Physical Review D, 98(7), p.072004_1 - 072004_13, 2018/10

AA2018-0655.pdf:1.13MB

https://doi.org/10.1103/PhysRevD.98.072004
 被引用回数：2 パーセンタイル：12.9(Astronomy & Astrophysics)

Dihadron and isolated direct photon-hadron angular correlations are measured in $$p$$$$+$$$$p$$ collisions at $$sqrt{s}=200$$ GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momentum $$k_T$$ and $$j_T$$ in the azimuthal nearly back-to-back region $$Deltaphisimpi$$. In this region, transverse-momentum-dependent evolution can be studied when several different hard scales are measured. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of $$p_{rm out}$$, the out-of-plane transverse momentum component perpendicular to the trigger particle, are measured. These widths are used to investigate possible effects from transverse-momentum-dependent factorization breaking. When accounting for the longitudinal momentum fraction of the away-side hadron with respect to the near-side trigger particle, the widths are found to increase with the hard scale; this is qualitatively similar to the observed behavior in Drell-Yan and semi-inclusive deep-inelastic scattering interactions. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at $$sqrt{s}=510$$ GeV. The nonperturbative jet widths also appear to increase with $$sqrt{s}$$ at a similar $$x_T$$, which is qualitatively consistent to similar measurements in Drell-Yan interactions.

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