Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA

XU Yi-Chun; SHAO Ming; ZHANG Zi-Ping

Chinese Physics C> 2007, Vol. 31> Issue(6) : 538-542

Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA

Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

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Abstract：
In proton-proton (p+p) collisions at √S=200GeV, it is found that the previously observed universal shape of transverse mass spectra of hadron production seems to break down into two species of baryons and mesons at higher transverse mass region. In order to understand the underlying physics mechanism, a Monte Carlo study is done using the PYTHIA event generator. The simulation results demonstrate that this difference exists not only within string fragmentation scheme but also within independent fragmentation scheme, and comes primarily from gluon jets within string fragmentation scheme at RHIC energy. The new introduced physics mechanisms in PYTHIA version6.3 indicate that the complicated string junction may contribute to this splitting effect between mesons and baryons.

References

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. Heinz M. Nucl. Part. Phys., 2005, 31: S141|S1462. Alper B et al. Nucl. Phys., 1975, B100: 2373. Alper B et al. Nucl. Phys., 1975, B87: 194. Sjostrand T et al. hep-ph/03081535. Sjostrand T et al. hep-ph/01082646. Adams J et al(STAR Collaboration). Phys. Rev. Lett.,2004, 92: 1123017. Adams J et al(STAR Collaboration). Phys. Lett., 2005,B616: 88. Adler C et al(PHENIX Collaboration). Phys. Rev. Lett.,2003, 91: 2418039. Sjostrand T, Skands P Z. hep-ph/040830210. Sjostrand T, Skands P Z. hep-ph/0402078

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XU Yi-Chun, SHAO Ming and ZHANG Zi-Ping. Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA[J]. Chinese Physics C, 2007, 31(6): 538-542.

XU Yi-Chun, SHAO Ming and ZHANG Zi-Ping. Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA[J]. Chinese Physics C, 2007, 31(6): 538-542. shu

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Received: 2006-09-27
Revised: 2006-11-30

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沈阳化工大学材料科学与工程学院沈阳 110142

Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at √S=200GeV Using PYTHIA

Corresponding author: XU Yi-Chun,

Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Received Date: 2006-09-27
Accepted Date: 2006-11-30
Available Online: 2007-06-05

Abstract: In proton-proton (p+p) collisions at √S=200GeV, it is found that the previously observed universal shape of transverse mass spectra of hadron production seems to break down into two species of baryons and mesons at higher transverse mass region. In order to understand the underlying physics mechanism, a Monte Carlo study is done using the PYTHIA event generator. The simulation results demonstrate that this difference exists not only within string fragmentation scheme but also within independent fragmentation scheme, and comes primarily from gluon jets within string fragmentation scheme at RHIC energy. The new introduced physics mechanisms in PYTHIA version6.3 indicate that the complicated string junction may contribute to this splitting effect between mesons and baryons.