2018年5月11日
Correlations of $μμ$, $eμ$, and $ee$ pairs in $p$+$p$ collisions at $\sqrt{s}=200$ GeV and implications for $c\bar{c}$ and $b\bar{b}$ production mechanisms
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PHENIX has measured the azimuthal correlations of muon pairs from charm and<br />
bottom semi-leptonic decays in $p$+$p$ collisions at $\sqrt{s}=200$ GeV, using<br />
a novel analysis technique utilizing both unlike- and like-sign muon pairs to<br />
separate charm, bottom and Drell-Yan contributions. The dimuon measurements<br />
combined with the previous electron-muon and dielectron measurements span a<br />
wide range in rapidity, and are well described by PYTHIA Tune A. Through a<br />
Bayesian analysis based on PYTHIA Tune A, we show that leading order pair<br />
creation is the dominant $(76\%\pm^{14}_{19}\%)$ contribution for $b\bar{b}$<br />
production, whereas the data favor the scenario in which next-to-leading-order<br />
processes dominate $c\bar{c}$ production. The small contribution of<br />
next-to-leading-order processes in $b\bar{b}$ production at the collision<br />
energies of the Relativistic Heavy Ion Collider contrasts with the case at<br />
Large-Hadron-Collider energies, where next-to-leading-order processes are<br />
expected to dominate.
bottom semi-leptonic decays in $p$+$p$ collisions at $\sqrt{s}=200$ GeV, using<br />
a novel analysis technique utilizing both unlike- and like-sign muon pairs to<br />
separate charm, bottom and Drell-Yan contributions. The dimuon measurements<br />
combined with the previous electron-muon and dielectron measurements span a<br />
wide range in rapidity, and are well described by PYTHIA Tune A. Through a<br />
Bayesian analysis based on PYTHIA Tune A, we show that leading order pair<br />
creation is the dominant $(76\%\pm^{14}_{19}\%)$ contribution for $b\bar{b}$<br />
production, whereas the data favor the scenario in which next-to-leading-order<br />
processes dominate $c\bar{c}$ production. The small contribution of<br />
next-to-leading-order processes in $b\bar{b}$ production at the collision<br />
energies of the Relativistic Heavy Ion Collider contrasts with the case at<br />
Large-Hadron-Collider energies, where next-to-leading-order processes are<br />
expected to dominate.
- ID情報
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- arXiv ID : arXiv:1805.04075