Gluon number fluctuations with heavy quarks at HERA

  • We study the effect of gluon number fluctuations (Pomeron loops) on the proton structure function at HERA. It is shown that the description of charm and bottom quarks and longitudinal structure functions are improved, with χ2/d.o.f,=0.803 (fluctuations) as compared with χ2/d.o.f,=0.908 (without fluctuations), once the gluon number fluctuations are included. We find that in the gluon number fluctuation case the heavy quarks do not play an important role in the proton structure function as the saturation model. The successful description of the HERA data indicates that the gluon number fluctuation could be one of the key mechanisms to describe the proton structure function at HERA energies.
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ZHU Xiang-Rong and ZHOU Dai-Cui. Gluon number fluctuations with heavy quarks at HERA[J]. Chinese Physics C, 2011, 35(10): 902-907. doi: 10.1088/1674-1137/35/10/003
ZHU Xiang-Rong and ZHOU Dai-Cui. Gluon number fluctuations with heavy quarks at HERA[J]. Chinese Physics C, 2011, 35(10): 902-907.  doi: 10.1088/1674-1137/35/10/003 shu
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Received: 2010-12-10
Revised: 2011-02-17
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Gluon number fluctuations with heavy quarks at HERA

Abstract: We study the effect of gluon number fluctuations (Pomeron loops) on the proton structure function at HERA. It is shown that the description of charm and bottom quarks and longitudinal structure functions are improved, with χ2/d.o.f,=0.803 (fluctuations) as compared with χ2/d.o.f,=0.908 (without fluctuations), once the gluon number fluctuations are included. We find that in the gluon number fluctuation case the heavy quarks do not play an important role in the proton structure function as the saturation model. The successful description of the HERA data indicates that the gluon number fluctuation could be one of the key mechanisms to describe the proton structure function at HERA energies.

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