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arXiv 1302.5873nucl-thhep-phnucl-ex
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高能重离子$γ$喷流碰撞的精细层析成像

Towards detailed tomography of high energy heavy-ion collisions by $γ$-jet

Guo-Liang Ma

摘要:

在考虑弦熔化的多相输运(AMPT)模型中,研究了$\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV的Pb+Pb碰撞中瞬发光子与喷注之间的横向动量不平衡.由于喷流部分子簇射与部分子物质之间强的部分子相互作用,喷流在更中心的碰撞中损失更多的能量,这比仅由于强子相互作用更重要。强子化和末态强子相互作用对不平衡的影响很小。不平衡比$x_{jγ}$对$γ$ -射流的产生位置和通过方向都很敏感,这为通过选择不同的$x_{jγ}$范围对所形成的部分子物质进行详细的$γ$ -射流层析成像提供了机会。还提出了与光子+喷注相关的$γ$ -强子方位角关联是观察介质对不同$γ$ -喷注产生组态的响应的一种探针。

英文摘要:

Within a multi-phase transport (AMPT) model with string melting scenario, the transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Jet loses more energy in more central collisions due to strong partonic interactions between jet parton shower and partonic matter, which is more significant than due to hadronic interactions only. The hadronization and final-state hadronic interactions have little influences on the imbalance. The imbalance ratio $x_{jγ}$ is sensitive to both production position and passing direction of $γ$-jet, which provides an opportunity to do detail $γ$-jet tomography on the formed partonic matter by selecting different $x_{jγ}$ ranges. It is also proposed that $γ$-hadron azimuthal correlation associated with photon+jet is a probe to see the medium responses to different $γ$-jet production configurations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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