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論文

Centrality-dependent modification of jet-production rates in deuteron-gold collisions at $$sqrt{s_{NN}}$$=200 GeV

Adare, A.*; 今井 憲一; 長谷川 勝一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他477名*

Physical Review Letters, 116(12), p.122301_1 - 122301_9, 2016/03

AA2015-1072.pdf:0.36MB

https://doi.org/10.1103/PhysRevLett.116.122301
 被引用回数：43 パーセンタイル：88.13(Physics, Multidisciplinary)

Jet production rates are measured in $$p+p$$ and $$d+$$Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the $$R$$ =0.3 anti-$$k_t$$ algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum ($$p_T$$) spectra are corrected for the detector response. Spectra are reported for jets with $$12 < p_T < 50$$ GeV/$$c$$ within a pseudorapidity acceptance of $$|eta|<0.3$$. The nuclear-modification factor ($$R_{d{rm Au}}$$) values and central-to-peripheral ratios ($$R_{CP}$$) show large, $$p_T$$-dependent deviations from unity, challenging the conventional models that relate hard-process rates and soft-particle production in collisions involving nuclei.

論文

$$phi$$ meson production in $$d$$ + Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他477名*

Physical Review C, 92(4), p.044909_1 - 044909_14, 2015/10

AA2015-0749.pdf:0.78MB

https://doi.org/10.1103/PhysRevC.92.044909
 被引用回数：12 パーセンタイル：63.27(Physics, Nuclear)

The PHENIX Collaboration has measured $$phi$$ meson production in $$d$$ + Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV using the dimuon and dielectron decay channels. The $$phi$$ meson is measured in the forward (backward) $$d$$-going (Au-going) direction, $$1.2 < y < 2.2$$ $$(-2.2 < y < -1.2)$$ in the transverse-momentum ($$p_T$$) range from 1-7 GeV/$$c$$ and at midrapidity $$|y| < 0.35$$ in the $$p_T$$ range below 7 GeV/$$c$$. The $$phi$$ meson invariant yields and nuclear-modification factors as a function of $$p_T$$, rapidity, and centrality are reported. An enhancement of $$phi$$ meson production is observed in the Au-going direction, while suppression is seen in the $$d$$-going direction, and no modification is observed at midrapidity relative to the yield in $$p+p$$ collisions scaled by the number of binary collisions. Similar behavior was previously observed for inclusive charged hadrons and open heavy flavor, indicating similar cold-nuclear-matter effects.

論文

Centrality dependence of low-momentum direct-photon production in Au + Au collisions at $$sqrt{s_{NN}} = 200$$ GeV

Adare, A.*; 今井 憲一; 谷田 聖; PHENIX Collaboration*; 他477名*

Physical Review C, 91(6), p.064904_1 - 064904_11, 2015/06

AA2015-0708.pdf:1.06MB

https://doi.org/10.1103/PhysRevC.91.064904
 被引用回数：124 パーセンタイル：99.3(Physics, Nuclear)

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at $$sqrt{s_{NN}} = 200$$ GeV down to $$p_T < 0.4 ;{rm GeV}/c$$. Photons are detected via photon conversions to $$e^+e^-$$ pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low $$p_T$$. We find an excess of direct photons above the $$N_{rm coll}$$-scaled yield measured in $$p+p$$ collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/$$c$$ in the $$p_T$$ range 0.6-2.0 GeV/$$c$$. While the shape of the $$p_T$$ distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with $$N_{rm part}^{alpha}$$, where $$alpha = 1.38 pm 0.03({rm stat}) pm 0.07({rm syst})$$.

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