Direct jet reconstruction in p plus p and Cu plus Cu collisions at PHENIX

作者：Lai Yue Shi^*

来源：Nuclear Physics A, 2011, 855(1): 295-298.

DOI：10.1016/j.nuclphysa.2011.02.063

• cross section
• fragmentation
• jet production
• nuclear modification factor
• quark-gluon plasma

Direct jet reconstruction in heavy ion collisions is an important probe for the in-medium parton energy loss and jet-medium interactions and reconstructed jets provide additional constraints to characterize the underlying mechanisms. However, traditional jet reconstruction algorithms operating in the large soft background at RHIC produce fake jets well above the intrinsic production rate of high-p(T) hard scattering, thus impeding the detection of the low cross section jet signal at RHIC energies. We developed a jet reconstruction algorithm that locates and reconstructs the jet energy using a Gaussian filter. This algorithm is combined with a fake jet rejection scheme that provides efficient jet reconstruction with acceptable fake rate in a background environment up to the central Au + Au collision at root s(NN) = 200 GeV. We present results of its application in p + p and Cu + Cu collisions using data from the PHENIX detector, including jet spectrum up to 60 GeV/c, nuclear modification factor, and fragmentation function.

• 出版日期2011-4-1