Forward Jet-like Event Spin-dependent Properties in Polarized p plus p Collisions at √s=200 GeV

被引：0
|
作者：
Poljak, Nikola [1 ]
机构：
[1] Univ Zagreb, Zagreb 41000, Croatia
来源：
19TH PARTICLES AND NUCLEI INTERNATIONAL CONFERENCE (PANIC11) | 2012年 / 1441卷
关键词：
jet-like events; single spin asymmetry; neutral pions; forward calorimetry; Collins effect; Sivers effect; HARD-SCATTERING;
D O I：
10.1063/1.3700621
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The STAR collaboration has reported precision measurements on the transverse single spin asymmetries for the production of forward pi(0) mesons from polarized proton collisions at the center of mass energy of 200 GeV. Disentangling contributions to forward asymmetries requires one to look beyond inclusive neutral pion production to the production of forward jets or direct photons. During the RHIC running in the year 2006, STAR with the Forward Pion Detector++ (FPD++) in place collected 6.8 inverse picobarn of data with an average polarization of 60%. FPD++ had sufficient acceptance for "jet-like" objects, which are clustered responses of an electromagnetic calorimeter primarily sensitive to incident photons, electrons and positrons. For the "jet-like" objects, we reconstructed the angle of the outgoing leading neutral pion with respect to the fragmenting parton, thus enabling us to disentangle the contributions to the forward pi(0) asymmetries. The simulated data set shows that on average there are approximately 2.5 fragmenting mesons per one "jet-like" object. Preliminary FPD++ results provide no evidence of measured contributions to the asymmetry from jet fragmentation, implying the Sivers distribution functions play a substantial role in producing the large inclusive pi(0) asymmetries previously measured by STAR.
引用
收藏
页码：573 / 575
页数：3
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