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arXiv 1807.07572nucl-thhep-ph
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磁化核物质中的翻转态

Upsilon states in magnetized nuclear matter

Amal Jahan C. S., Shivam Kesarwani, Sushruth Reddy P., Nikhil Dhale, Amruta Mishra

摘要:

利用手征效应模型研究了磁化核物质中底鎓态($Υ(NS)$、$N=1,2,3,4$和$Υ(1D)$)的质量修正.在模拟QCD胶子凝聚的手征有效模型中,介质内质量是由标量胶子场的介质修正计算的。由$Υ(NS)$的参数$β$表示的波函数(假定为谐振子波函数)的强度$N=1,2,3,4$从其观测到的衰减宽度拟合到$e^+e^-$。通道的衰减宽度,$Υ(1D) \rightarrow e^+ e^-$ %,这还没有被观察到的实验,已被预测在本工作中,通过使用的值的参数,$β$为$Υ(1D)$,内插从$β$与质量的关系,为uppermant状态。研究了核介质的同位旋不对称性对uppermance态质量的影响,并观察到高密度下的影响很大。在FAIR、GSI以及SPS、CERN的压缩重子物质(CBM)实验中,这应该会对非对称重离子碰撞产生可观察到的结果。然而,在CBM研究bottomonium态将需要获得比目前计划的能量更高的能量。本文研究了磁场对核物质中底鎓态质量的影响。这些质量包括核子的反常磁矩(AMM)的影响,并与不考虑核子的反常磁矩时的结果进行了比较。磁场和同位旋不对称性对上升质量的影响在高密度时很大。

英文摘要:

The mass modifications of the bottomonium states ($Υ(NS)$,$N=1,2,3,4$ and $Υ(1D)$) in magnetized nuclear matter are studied using chiral effective model. The in-medium masses are calculated from the medium modification of the scalar dilaton field in the chiral effective model, which simulates the gluon condensates of QCD. The strengths of the wave functions (assumed to be harmonic oscillator wave functions) denoted by the parameter, $β$, of the $Υ(NS)$, $N=1,2,3,4$, are fitted from their observed decay widths to $e^+e^-$. The decay width for the channel, $Υ(1D) \rightarrow e^+ e^-$ %, which has not yet been observed experimentally, has been predicted in the present work, by using the value of the parameter, $β$ for $Υ(1D)$, interpolated from the $β$ versus mass relation, for the upsilon states. The effects of the isospin asymmetry of the nuclear medium on the masses of the upsilon states are investigated and are observed to be large for high densities. This should have observable consequences at the asymmetric heavy ion collisions at the Compressed baryonic matter (CBM) experiments at FAIR, GSI as well as at SPS, CERN. The study of the bottomonium states at CBM will however require access to higher energies than the energy regime planned at present. The effects of magnetic field on the masses of bottomonium states in nuclear matter are studied in the present work. These masses are investigated including the anomalous magnetic moments (AMM) of the nucleons, and compared to the results when the AMMs of nucleons are not taken into account. The effects of magnetic field as well as isospin asymmetry on the upsilon masses are obserevd to be large at high densities.

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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