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Chinese Physics C> 2018, Vol. 42> Issue(11) : 114001 DOI: 10.1088/1674-1137/42/11/114001

Large angle radiation effect on jet measurement in pp collisions at s=7 TeV at the LHC

  • 1.

      Nano-Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China

  • 2.

      College of Science, China Three Gorges University, Yichang 443002, China

  • 3.

      Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China

  • Jet measurement is an ideal probe to explore the properties of the hot dense matter created in ultra-relativistic heavy-ion collisions. Recent results at the LHC show that large angle radiation is non-negligible, but the mechanisms and phenomenology of large angle radiation are still unclear and hotly debated. Considering the coexistence and competition of different physics mechanisms qualitatively, it is assumed that the radiation angle is enhanced randomly over a wide range based on the collinear approximation. Its effects on di-jet momentum imbalance, jet fragmentation function and jet shape are studied in pp collisions at 7 TeV. The results show that di-jet asymmetry is insensitive to large angle radiation, while jet shape and jet fragmentation functions are more sensitive and could explain experimental data well. We conclude that de-collimated radiation cannot be ignored for soft jets, and there is a contribution from large angle radiation (φ>0.7) of about 8%, which is significant for jet intrinsic structure measurement at pT,jet<80 GeV/c.
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  • References

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Ren-Zhuo Wan, Si-Yuan Wang, Shuang Li, Yi-Ming Feng, Feng Liu, Fan Yang and Dai-Cui Zhou. Large angle radiation effect on jet measurement in pp collisions at s=7 TeV at the LHC[J]. Chinese Physics C, 2018, 42(11): 114001. doi: 10.1088/1674-1137/42/11/114001
Ren-Zhuo Wan, Si-Yuan Wang, Shuang Li, Yi-Ming Feng, Feng Liu, Fan Yang and Dai-Cui Zhou. Large angle radiation effect on jet measurement in pp collisions at s=7 TeV at the LHC[J]. Chinese Physics C, 2018, 42(11): 114001.  doi: 10.1088/1674-1137/42/11/114001 shu
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Received: 2018-06-05
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    Supported by National Natural Science Foundation of China (11505130, 11775097, IRG1152106, 11475068) and CTGU (1910103, B2018023)

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Large angle radiation effect on jet measurement in pp collisions at s=7 TeV at the LHC

  • 1.  Nano-Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China
  • 2.  College of Science, China Three Gorges University, Yichang 443002, China
  • 3.  Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
  • Received Date: 2018-06-05
  • Available Online: 2018-11-05
Fund Project:  Supported by National Natural Science Foundation of China (11505130, 11775097, IRG1152106, 11475068) and CTGU (1910103, B2018023)

Abstract: Jet measurement is an ideal probe to explore the properties of the hot dense matter created in ultra-relativistic heavy-ion collisions. Recent results at the LHC show that large angle radiation is non-negligible, but the mechanisms and phenomenology of large angle radiation are still unclear and hotly debated. Considering the coexistence and competition of different physics mechanisms qualitatively, it is assumed that the radiation angle is enhanced randomly over a wide range based on the collinear approximation. Its effects on di-jet momentum imbalance, jet fragmentation function and jet shape are studied in pp collisions at 7 TeV. The results show that di-jet asymmetry is insensitive to large angle radiation, while jet shape and jet fragmentation functions are more sensitive and could explain experimental data well. We conclude that de-collimated radiation cannot be ignored for soft jets, and there is a contribution from large angle radiation (φ>0.7) of about 8%, which is significant for jet intrinsic structure measurement at pT,jet<80 GeV/c.

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