Characterizing variable for the critical point in momentum space

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DU Jia-Xin, KE Hong-Wei, XU Ming-Mei and LIU Lian-Shou. Characterizing variable for the critical point in momentum space[J]. Chinese Physics C, 2009, 33(8): 655-660. doi: 10.1088/1674-1137/33/8/011
DU Jia-Xin, KE Hong-Wei, XU Ming-Mei and LIU Lian-Shou. Characterizing variable for the critical point in momentum space[J]. Chinese Physics C, 2009, 33(8): 655-660.  doi: 10.1088/1674-1137/33/8/011 shu
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Received: 2008-10-09
Revised: 2009-01-29
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Characterizing variable for the critical point in momentum space

    Corresponding author: LIU Lian-Shou,

Abstract: 

The possible experimentally observable signal in momentum space for the critical point, which is free from the contamination of statistical fluctuations, is discussed. It is shown that the higher order scaled moment of transverse momentum can serve as an appropriate signal for the critical point, provided the transverse momentum distribution has a sudden change when energy increases passing through this point. A 2-D percolation model with a linear temperature gradient is constructed to check this suggestion. A sudden change of third order scaled moment of transverse momentum is observed.

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