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

HAN Ran

Chinese Physics C> 2007, Vol. 31> Issue(12) : 1189-1191

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

HAN Ran ^,

School of Physics, Peking University, Beijing 100871, China

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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 P_Λ as extracted from the data.

References

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. 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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沈阳化工大学材料科学与工程学院沈阳 110142

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

HAN Ran ^,

Corresponding author: HAN Ran,

School of Physics, Peking University, Beijing 100871, China

Received Date: 2007-07-17
Accepted Date: 1900-01-01
Available Online: 2007-12-05

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 P_Λ as extracted from the data.