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arXiv 0804.4448nucl-ex
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STAR的非光子电子-强子关联

Non-photonic electron-hadron correlations at STAR

Gang Wang

摘要:

我们目前的STAR的测量在p+p,Cu+Cu和Au+Au碰撞在200 GeV的非光子电子和带电强子之间的方位角相关。在p+p碰撞中,从非光子e-h关联中提取了B介子对非光子电子的半轻子衰变贡献,直到电子$p_t \sim 9$ GeV/ $c$ .在中心Cu+Cu和Au+Au碰撞中,产生了致密介质,我们发现触发非光子电子的远离侧的e-h关联与PYTHIA模拟的预期相比已经被修改。

英文摘要:

We present STAR's measurements of azimuthal correlations between non-photonic electrons and charged hadrons in p+p, Cu+Cu and Au+Au collisions at 200 GeV. In p+p collisions, from the non-photonic e-h correlation we have extracted the relative B meson semi-leptonic decay contributions to non-photonic electrons up to electron $p_t \sim 9$ GeV/$c$. In central Cu+Cu and Au+Au collisions where a dense medium is created, we find that the e-h correlation on the away side of the trigger non-photonic electron has been modified in comparison with the expectation from PYTHIA simulations.

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