High Energy Physics - Experiment
[Submitted on 28 Jan 2013 (v1), last revised 3 Feb 2013 (this version, v4)]
Title:Six "beyond Collins and Sivers" transverse spin asymmetries at COMPASS
View PDFAbstract:COMPASS is a fixed-target high energy physics experiment at the SPS at CERN \cite{Abbon:2007pq}. One of the important objectives of the experiment is the exploration of the transverse spin structure of the nucleon via spin dependent azimuthal asymmetries in single-hadron production in deep inelastic scattering of polarized leptons off transversely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and transversely polarized $^6LiD$ (in 2002, 2003 and 2004) and $NH_3$ (in 2007 and 2010) targets.
Till now main attention was focused on Collins and Sivers asymmetries and obtained results play an important role in the general understanding of the three-dimensional nature of the nucleon in terms of Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs) and Fragmentation Functions (FFs).
In addition to these two measured leading-twist effects, the SIDIS cross-section counts six more target transverse spin dependent azimuthal effects, which have their own well defined leading or higher-twist interpretation in terms of QCD parton model. So far COMPASS presented preliminary results for these asymmetries from deuteron \cite{Parsamyan:2007ju},\cite{Kotzinian:2007uv} and "proton-2007" data \cite{Parsamyan:2010se}. In this contribution we review the results obtained with the last "proton-2010" data sample.
Submission history
From: Bakur Parsamyan [view email][v1] Mon, 28 Jan 2013 17:15:19 UTC (42 KB)
[v2] Tue, 29 Jan 2013 09:23:54 UTC (42 KB)
[v3] Thu, 31 Jan 2013 14:13:01 UTC (42 KB)
[v4] Sun, 3 Feb 2013 10:34:35 UTC (42 KB)
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