Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions

Liu Feng(Y); Liu Feng

Chinese Physics C> 1997, Vol. 21> Issue(4) : 330-339

Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions

Liu Feng(Y) ^, ,
Liu Feng

Institute of Particle Physics,Huazhong Normal University,Wuhan 430070

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Abstract：
Using the“con ealgorithm”in QCD to identify jet,the hard and soft processes in high energy hadroncic olisions are analysed indetail.A Monte Carlo simulation event sample is produced by PYTHIA.The resultant pseudorapidity distribution of jets has a plateau in the central region.The particle and transverse energy density in jets decreases exponentially with the increase of the distance from particles to jet axis.Through comparisons,we find the event average transverse momentum or maximum transverse momentum is positively correlated with multiplicity for the whole event sample,and negatively correlated with multiplicity for jet event subsample.Two ratio variables well describe the hardness of jet events,and they are positively correlated with the event average transverse momentum and negatively correlated with multiplicity,which confirms the event average transverse momentum is a better characteristic quantity to describe the hardness of jet events than multiplicity.

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Liu Feng(Y) and Liu Feng. Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions[J]. Chinese Physics C, 1997, 21(4): 330-339.

Liu Feng(Y) and Liu Feng. Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions[J]. Chinese Physics C, 1997, 21(4): 330-339. shu

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Received: 1900-01-01
Revised: 1900-01-01

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Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions

Liu Feng(Y) ^,
Liu Feng

Corresponding author: Liu Feng(Y),

Institute of Particle Physics,Huazhong Normal University,Wuhan 430070

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1997-04-05

Abstract: Using the“con ealgorithm”in QCD to identify jet,the hard and soft processes in high energy hadroncic olisions are analysed indetail.A Monte Carlo simulation event sample is produced by PYTHIA.The resultant pseudorapidity distribution of jets has a plateau in the central region.The particle and transverse energy density in jets decreases exponentially with the increase of the distance from particles to jet axis.Through comparisons,we find the event average transverse momentum or maximum transverse momentum is positively correlated with multiplicity for the whole event sample,and negatively correlated with multiplicity for jet event subsample.Two ratio variables well describe the hardness of jet events,and they are positively correlated with the event average transverse momentum and negatively correlated with multiplicity,which confirms the event average transverse momentum is a better characteristic quantity to describe the hardness of jet events than multiplicity.