New target transverse spin dependent azimuthal asymmetries from COMPASS experiment

New target transverse spin dependent azimuthal asymmetries from COMPASS experiment
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COMPASS 实验中新的目标横向自旋相关方位不对称性

DOI:
10.1140/epjst/e2008-00780-1
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发表时间:
2007
期刊:
The European Physical Journal Special Topics
影响因子:
--
通讯作者:
B. Parsamyan
B. Parsamyan
中科院分区:
--
文献类型:
--
作者:
B. Parsamyan

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一般情况下,八个目标横向自旋相关的方位角调制允许在半包含深度非弹性散射的极化轻子的横向极化目标。在QCD部分子模型中,这些不对称性中的四个可以在首阶方法中解释。其中两种效应,即柯林斯效应和西弗斯效应,已经在爱马仕和COMPASS实验中测量过。另外两个主要的扭曲和剩余的四个方位角不对称,可以解释为扭曲三的贡献已被首次在COMPASS中使用160 GeV/c的纵向极化(PI)~-0.8)μ子束和横向极化6LiD靶测量。我们在此介绍2002-2004年数据的初步结果。
In general, eight target transverse spin-dependent azimuthal modulations are allowed in semi inclusive deep inelastic scattering of polarized leptons on a transversely polarized target. In the QCD parton model four of these asymmetries can be interpreted within the leading order approach. Two of them, namely Collins and Sivers effects were already measured by HERMES and COMPASS experiments. Other two leading twist and remaining four azimuthal asymmetries which can be interpreted as twist-three contributions have been measured for the first time in COMPASS using a 160 GeV/c longitudinally polarized (Pl }~ −0.8) muon beam and a transversely polarized 6LiD target. We present here the preliminary results from the 2002–2004 data.
DOI: 10.1103/physrevlett.94.012002
发表时间: 2004-08
影响因子: 8.6
作者:
The Hermes Collaboration
通讯作者: The Hermes Collaboration
H.Sakaki;H.Kurata;M.Yamanishi:电子通讯。
DOI: --
发表时间: --
期刊:
影响因子: --
作者:
通讯作者: --
DOI: --
发表时间: 2007
期刊: Nuclear Physics B765
影响因子: --
作者:
E. S. Ageev T. Iwata;T. Matsuda N. Horikawa and COMPASS collaboration
通讯作者: T. Matsuda N. Horikawa and COMPASS collaboration