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Production Of B¯B At Forward Rapidity In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Production Of B¯B At Forward Rapidity In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Engineering and Physics
The cross section of bottom quark-antiquark (b¯b) production in p+p collisions at √s=510 GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider. The results are based on the yield of high mass, like-sign muon pairs measured within the PHENIX muon arm acceptance (1.2<|y|<2.2). The b¯b signal is extracted from like-sign dimuons by utilizing the unique properties of neutral B meson oscillation. We report a differential cross section of dσb¯b→μ±μ±/dy=0.16±0.01 (stat)±0.02 (syst)±0.02 (global) nb for like-sign muons in the rapidity and pT ranges 1.2<|y|<2.2 and pT>1 GeV/c, and dimuon mass of 5–10 GeV/c2. The extrapolated total cross section at this energy for b¯b production is 13.1±0.6 (stat)±1.5 (syst)±2.7 (global) μb. The total cross section is compared to a perturbative quantum chromodynamics calculation and is consistent within uncertainties. The azimuthal opening angle between muon pairs from b¯b decays and …
Polarization And Cross Section Of Midrapidity J/Ψ Production In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Polarization And Cross Section Of Midrapidity J/Ψ Production In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Engineering and Physics
The PHENIX experiment has measured the spin alignment for inclusive J/ψ→e+e− decays in proton-proton collisions at √s=510 GeV at midrapidity. The angular distributions have been measured in three different polarization frames, and the three decay angular coefficients have been extracted in a full two-dimensional analysis. Previously, PHENIX saw large longitudinal net polarization at forward rapidity at the same collision energy. This analysis at midrapidity, complementary to the previous PHENIX results, sees no sizable polarization in the measured transverse momentum range of 0.0
Measurement Of J/Ψ At Forward And Backward Rapidity In P+P, P+Al, P+Au, And 3he+Au Collisions At √Snn=200 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Measurement Of J/Ψ At Forward And Backward Rapidity In P+P, P+Al, P+Au, And 3he+Au Collisions At √Snn=200 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Engineering and Physics
Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of J/ψ measurements at forward and backward rapidity in various small collision systems, p+p, p+Al, p+Au, and 3He+Au, at √sNN=200 GeV. The results are presented in the form …
Nuclear-Modification Factor Of Charged Hadrons At Forward And Backward Rapidity In P + Al And P + Au Collisions At √Snn=200gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Nuclear-Modification Factor Of Charged Hadrons At Forward And Backward Rapidity In P + Al And P + Au Collisions At √Snn=200gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Engineering and Physics
The PHENIX experiment has studied nuclear effects in p+Al and p+Au collisions at √sNN=200GeV on charged hadron production at forward rapidity (1.4<η<2.4, p-going direction) and backward rapidity (−2.2<η<−1.2, A-going direction). Such effects are quantified by measuring nuclear modification factors as a function of transverse momentum and pseudorapidity in various collision multiplicity selections. In central p+Al and p+Au collisions, a suppression (enhancement) is observed at forward (backward) rapidity compared to the binary scaled yields in p+p collisions. The magnitude of enhancement at backward rapidity is larger in p+Au collisions than in p+Al collisions, which have a smaller number of participating nucleons. However, the results at forward rapidity show a similar suppression within uncertainties. The results in the integrated centrality are compared with calculations using nuclear parton distribution functions, which show a reasonable agreement at the forward rapidity but fail to describe the backward rapidity enhancement.
J/Ψ And Ψ(2s) Production At Forward Rapidity In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
J/Ψ And Ψ(2s) Production At Forward Rapidity In P+P Collisions At √S=510 Gev, Mike Daugherity, Donald Isenhower, Rusty Towell
Engineering and Physics
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section, mean transverse momentum, mean transverse momentum squared of inclusive J/ψ, and cross section ratio of ψ(2S) to J/ψ at forward rapidity in p+p collisions at √s=510 GeV via the dimuon decay channel. Comparison is made to inclusive J/ψ cross sections measured at √s=200 GeV and 2.76–13 TeV. The result is also compared to leading-order nonrelativistic QCD calculations coupled to a color-glass-condensate description of the low-x gluons in the proton at low transverse momentum (pT) and to next-to-leading order nonrelativistic QCD calculations for the rest of …