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arXiv 1203.2160nucl-ex
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$\sqrt{s_{\rm NN}}=2.76$ TeV中心Pb-Pb碰撞中高横动量D介子的抑制

Suppression of high transverse momentum D mesons in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV

ALICE Collaboration

备注：
29 pages, 9 captured figures, 6 tables, authors from page 24, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3104
发表信息：
JHEP 09 (2012) 112
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摘要：

利用ALICE探测器测量了LHC中Pb-Pb碰撞中瞬发粲介子$D^0$、$D^+$、$D^{*+}$及其反粒子的产生，每个核子-核子碰撞的质心能量为$\sqrt{s_{NN}}=2.76$ TeV。在中心快度$|y|<0.5$下，在$2<p_{\rm T}<16$ GeV/c范围内的$p_{\rm T}$ -差分产生产额用于计算核修饰因子$R_{AA}$，该核修饰因子相对于质子-质子参比从在$\sqrt{s}=7$ TeV下测量的截面获得，并换算为$\sqrt{s}=2.76$ TeV。对于这三种介子，当横动量大于5 GeV/c时，$R_{AA}$对20%的最中心碰撞有3-4倍的抑制.外围碰撞的抑制减少。

英文摘要：

The production of the prompt charm mesons $D^0$, $D^+$, $D^{*+}$, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the LHC, at a centre-of-mass energy $\sqrt{s_{NN}}=2.76$ TeV per nucleon--nucleon collision. The $p_{\rm T}$-differential production yields in the range $2<p_{\rm T}<16$ GeV/c at central rapidity, $|y|<0.5$, were used to calculate the nuclear modification factor $R_{AA}$ with respect to a proton-proton reference obtained from the cross section measured at $\sqrt{s}=7$ TeV and scaled to $\sqrt{s}=2.76$ TeV. For the three meson species, $R_{AA}$ shows a suppression by a factor 3-4, for transverse momenta larger than 5 GeV/c in the 20% most central collisions. The suppression is reduced for peripheral collisions.

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