arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1105.4033nucl-exnucl-th
收藏

流对RHIC和LHC核-核碰撞中热光子角分布和谱影响的经验估计

Empirical estimation the effects of flow on thermal photon angular distribution and spectra in nucleus-nucleus collisions at RHIC and LHC

V. S. Pantuev

摘要:

利用强子径向流和椭圆流的实验数据,研究了它们对RHIC热光子谱形状的影响。撇开光子产生的实际机制及其时间演化不谈,我们集中讨论光谱形状。体块的径向和纵向流动可以通过多普勒效应显著改变所观察到的光子能谱。实验热光子数据由局部框架温度参数描述,该参数依赖于纵向和径向流动假设。从观察到的强子椭圆流,我们估计的调制径向流参数与相对于反应平面的角度。在此基础上,我们计算了热光子的椭圆流参数,发现它与强子的椭圆流参数非常接近。考虑到强子椭圆流在LHC和RHIC中的振幅非常相似,我们证明了LHC中的热光子也应该表现出大的椭圆流。所有这些考虑对于低不变质量双轻子对也是有效的。

英文摘要:

Experimental data for hadron radial and elliptic flow are used to investigate their influence on the shape of the thermal photon spectrum at RHIC. Leaving alone the actual mechanism of photon production and its time evolution, we concentrate on the spectrum shape. Radial and longitudinal flow of the bulk can change significantly the observed photon energy spectrum via the Doppler Effect. Experimental thermal photon data are described by local frame temperature parameter which depends on the assumption of longitudinal and radial flow. From the observed hadron elliptic flow we estimate the modulation of radial flow parameter versus the angle relative to the reaction plane. Based on this we calculate elliptic flow parameter for thermal photons, which was found to be very close to that for hadrons. Considering very similar amplitude for hadron elliptic flow at LHC and RHIC, we demonstrate that thermal photons at LHC should show large elliptic flow as well. All of these considerations are also valid for the low invariant mass dilepton pairs.

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。

↑