Polarization of Anti-Lambda in s=200GeV Polarized Proton-Proton Collision

  • We study the polarization of produced Λ in s=200GeV polarized proton-proton collision at RHIC/PHENIX, and also the polarization as a function of its rapidity which may be sensitivity to the quark helicity distributions of the proton and to the polarized fragmentation functions of the quark into the baryon. For polarized data collected in 2003 a very clean Λ peak in pπ+ invariant mass spectrum in the mid-rapidity(|η|<0.35) is obtained. In this letter, we report the calculation process of PΛ as extracted from the data.
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  • [1] . de Florian D, Stratmann M, Vogelasang W. Phys. Rev.Lett., 1998, 81: 530; XU Q H, LIU C X, LIANG Z T.Phys. Rev., 2002, D65: 114008; Boros C, Londergan J T,Thomas A W. Phys. Rev., 2000, D62: 014021; MA B Q etal. Nucl. Phys., 2002, A703: 3462. Buskulic D et al. (ALEPH Collaboration). Phys. Lett.,1996, B374: 319; Ackersta K et al. (OPAL Collaboration). Eur. Phys. J., 1998, C2: 493. Bunce G, Saito N, So er J et al. RIKEN-AF-NP-360, July20004. Togawa M et al. RIKEN Accel. Prog. Rep., 2007, 40
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HAN Ran. Polarization of Anti-Lambda in s=200GeV Polarized Proton-Proton Collision[J]. Chinese Physics C, 2007, 31(12): 1189-1191.
HAN Ran. Polarization of Anti-Lambda in s=200GeV Polarized Proton-Proton Collision[J]. Chinese Physics C, 2007, 31(12): 1189-1191. shu
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Received: 2007-07-17
Revised: 1900-01-01
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Polarization of Anti-Lambda in s=200GeV Polarized Proton-Proton Collision

    Corresponding author: HAN Ran,
  • School of Physics, Peking University, Beijing 100871, China

Abstract: We study the polarization of produced Λ in s=200GeV polarized proton-proton collision at RHIC/PHENIX, and also the polarization as a function of its rapidity which may be sensitivity to the quark helicity distributions of the proton and to the polarized fragmentation functions of the quark into the baryon. For polarized data collected in 2003 a very clean Λ peak in pπ+ invariant mass spectrum in the mid-rapidity(|η|<0.35) is obtained. In this letter, we report the calculation process of PΛ as extracted from the data.

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