Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions

LV Yan; YANG Li-Jian; YANG Li-Ping; MAO Tian

Chinese Physics C> 2001, Vol. 25> Issue(11) : 1077-1083

Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

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Abstract：
On the basis of "cone" jet algorithm, a Monte Carlo study of the properties of (mini) jets in high energy hadron hadron collsions is carried out. Using the "jetty frame", in which the momentum of jet is chosen as Z axis, the distributions of physical quantities inside jets multiplicity, pseudorapidity, azimuthal angle and transverse momentum are obtained. The pseudorapidity distribution is asymetric, concentrating in the forward direction, which means that all the particles in the jet are moving forward in the direction of the total momentum of jet. This is further proved by a particle momenta plot in the axial coordinate which shows that the jets look like sharp arrows with small forward pointing feathers at the ends. The transverse momentum distribution for the event sample with respect to the direction of incident hadrons diviates from an exponential distribution considerably, in consistent with the productuon of (mini )jets, while that inside jets with respect to the jet axis is basically an exponential. This means that the production of (mini ) jets is hard process, while the developement of jets is basically soft. These results show that "cone algorithm" is an effective method for the study of hard and semi hard processes in high energy hadron hadron and relativistic heavy ion collisions. It is found through the comparison of the distributions in jetty events and no jet events that E_t=2GeV is a more reasonable cut for the "cone algorithm" in finding jets.

References

[1]

. LIU LianShou,WU YuanFang.Multiparticle Productionin High Energy Collisions.Shanghai:Science and Technique Publisher of Shanghai,1998(in Chinese)(刘连寿,吴元芳.高能碰撞多粒子产生.上海:上海科学技术出版社,1998)2. Arnison G et al(UA1 Collab).Phys.Lett.,1982,B118:1673. Arnison G et al(UA1 Collab).Phys.Lett.,1983,B123:1154. Ciapetti(UA1 Collab).〈pt〉CHDependenceon Event Multiplicityin Minimum Bias Events at the SPS Collider,Proc.5th Topical Workshop on Proton Antiproton Collider Physics,eds.Greco M ,1985 5. Harris J W .Nucl.Phys.,1994,A566:277 6. Kajantie K ,Landshoff P V ,Lindfors J. Phys.Rev.Lett.,1987,59:2527 7. Wang X N .Phys.Reports,1997,280:2878. Gyulassy M ,PluｍｅｒＭ.Phys.Lett.,1990,B243:4329. Gyulassy M et al.Nucl.Phys.,1992,A538:3710. Wang X N ,Huang Z ,Sarcevic I.Phys.Rev.Lett.,1996,77:231 11. Sj strand T .Comp.Phys.Commun.,1994,82:7412. LIUMing et al.High Energy Phys.and Nucl.Phys.,1997,21:138(in Chinese)(刘明等.高能物理与核物理,1997,21:138) 13. WU YuanFang,LIU LianShou.Phys.Rev.,1990,D41:845

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LV Yan, YANG Li-Jian, YANG Li-Ping and MAO Tian. Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions[J]. Chinese Physics C, 2001, 25(11): 1077-1083.

LV Yan, YANG Li-Jian, YANG Li-Ping and MAO Tian. Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions[J]. Chinese Physics C, 2001, 25(11): 1077-1083. shu

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Received: 2000-12-04
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Received Date: 2000-12-04

Accepted Date: 1900-01-01

Available Online: 2001-11-05

Abstract: On the basis of "cone" jet algorithm, a Monte Carlo study of the properties of (mini) jets in high energy hadron hadron collsions is carried out. Using the "jetty frame", in which the momentum of jet is chosen as Z axis, the distributions of physical quantities inside jets multiplicity, pseudorapidity, azimuthal angle and transverse momentum are obtained. The pseudorapidity distribution is asymetric, concentrating in the forward direction, which means that all the particles in the jet are moving forward in the direction of the total momentum of jet. This is further proved by a particle momenta plot in the axial coordinate which shows that the jets look like sharp arrows with small forward pointing feathers at the ends. The transverse momentum distribution for the event sample with respect to the direction of incident hadrons diviates from an exponential distribution considerably, in consistent with the productuon of (mini )jets, while that inside jets with respect to the jet axis is basically an exponential. This means that the production of (mini ) jets is hard process, while the developement of jets is basically soft. These results show that "cone algorithm" is an effective method for the study of hard and semi hard processes in high energy hadron hadron and relativistic heavy ion collisions. It is found through the comparison of the distributions in jetty events and no jet events that E_t=2GeV is a more reasonable cut for the "cone algorithm" in finding jets.

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