J/ψ hadron interaction in vacuum and in QGP
J/ψ hadron interaction in vacuum and in QGP
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DOI：
10.1088/0954-3899/34/8/s109
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发表时间：
2007-08-01
影响因子：
3.5
通讯作者：
Song, Taesoo
中科院分区：
文献类型：
--
作者：
Lee, Su Houng;Park, Yongjae;Song, Taesoo
最近的晶格数据表明J/psi在1.6T（c）下仍然存在，受此启发，我们在微扰QCD中计算了有限温度下J/psi的热宽度。计算的输入是部分子夸克偶素在QCD中NLO处的解离截面，这是以前由Song和Lee获得的，以及高斯粲偶素波函数，其大小通过求解从有限温度下的晶格中提取的势中的粲偶素的薛定谔方程来拟合到Wong的估计。我们发现，总的热宽度超过1.4T（c）变得大于100至200 MeV，取决于夸克和胶子的有效热质量，我们采取它从600到400 MeV。
Motivated by the recent lattice data that J/psi will survive up to 1.6T(c), we calculate the thermal width of J/psi at finite temperature in perturbative QCD. The inputs of the calculation are the parton quarkonium dissociation cross sections at the NLO in QCD, which were previously obtained by Song and Lee, and a Gaussian charmonium wavefunction, whose size was fitted to an estimate by Wong by solving the Schrodinger equation for charmonium in a potential extracted from the lattice at finite temperature. We find that the total thermal width above 1.4T(c) becomes larger than 100 to 200 MeV, depending on the effective thermal masses of the quark and gluon, which we take it to vary from 600 to 400 MeV.