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Chinese Physics C> 2005, Vol. 29> Issue(6) : 549-554 

Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment

  •  Institute of High Energy Physics,CAS,Beijing 100049,China2 Department of Physics,Yunnan University,Kunming 650091,China

  • The distortion of the secondary charged particle trajectories of EAS in the geomagnetic field distorts the lateral distribution of the secondaries. The variation of the geomagnetic effect with the azimuth angle in different zenith angle intervals for YBJ-ARGO experiment is studied using Monte Carle simulation. The geomagnetic field leads to a stretched lateral distribution of the secondaries, thus both the density of the secondaries near the shower axis and the trigger efficiency of the array decrease. This effect is larger for the showers coming from the north than that from the south, such that the trigger efficiency for the former is lower than that for the latter. The north-south asymmetry becomes more evident with larger zenith angles.
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    [1] .Fut agami et al.Phys.Rev.Lett.,1999,82:2644-26482.Chadwick et al.APJ.,1999,513:1613.Ivanov A A et al.JETP Letters,1999,69(4):288-2934.Bahmanabadi M et al.Proceedings of ICRC 2001.586-5895.CUI Shu-Wang.PhDThesis,Institute ofHigh Energy Physics,CAS,2004(in Chinese)(崔树旺.博士论文,中国科学院高能物理研究所,2004)6.HE Hui-Hai et al.HEPNP,2001,25(1):79- 85(in Chinese)(何会海等.高能物理与核物理,2001,25(1):79-85)7.Capdevielle J N et al.KfK Report,1992,No.49988.Mart ello D et al.ARGO Detector with GEANT3 Package,20009.QU Ruo-Fei et al.HEPNP,2001,25(5):371 -376(in Chinese)(瞿若飞等.高能物理与核物理,2001,25(5):371-376)10.ARGO Collaborat ion.Astroparticle Physics with ARGO Proposal,1996;ARGO Collaboration.Addendum to the ARGO-YBJ Proposal,199811.Mastroianni S et al.Proceedings of ICRC 2003.769- 77212.QU Ruo-Fei.PhM Thesis,Inst itute of High Energy Physics,CAS,2001(in Chinese)(瞿若飞.硕士论文,中国科学院高能物理研究所,2001)13.Silvia Vernetto et al.Proceedings of ICRC 2003.3007 -3010

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ZHOU Yuan, HE Hui-Hai and MU Jun. Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(6): 549-554.
ZHOU Yuan, HE Hui-Hai and MU Jun. Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(6): 549-554. shu
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Received: 2004-11-04
Revised: 1900-01-01
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Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment

    Corresponding author: ZHOU Yuan,
  • Institute of High Energy Physics,CAS,Beijing 100049,China2 Department of Physics,Yunnan University,Kunming 650091,China
  • Received Date: 2004-11-04
  • Accepted Date: 1900-01-01
  • Available Online: 2005-06-05

Abstract: The distortion of the secondary charged particle trajectories of EAS in the geomagnetic field distorts the lateral distribution of the secondaries. The variation of the geomagnetic effect with the azimuth angle in different zenith angle intervals for YBJ-ARGO experiment is studied using Monte Carle simulation. The geomagnetic field leads to a stretched lateral distribution of the secondaries, thus both the density of the secondaries near the shower axis and the trigger efficiency of the array decrease. This effect is larger for the showers coming from the north than that from the south, such that the trigger efficiency for the former is lower than that for the latter. The north-south asymmetry becomes more evident with larger zenith angles.

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