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Published Articles
Title	Polarised Drell-Yan measurements at $\mathrm{COMPASS}$
Author(s)	Chiosso, Michela (Turin U. ; INFN, Turin)
Collaboration	COMPASS Collaboration
Publication	2015
Number of pages	4
In:	EPJ Web Conf. 85 (2015) 02036
In:	4th International Workshop on Transverse Polarization Phenomena in Hard Processes, Cagliari, Italy, 09 - 13 Jun 2014, pp.02036
DOI	10.1051/epjconf/20158502036
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; COMPASS NA58
Abstract	Much of the information that exists today about Transverse Momentum Dependent Parton Distribution Functions (TMDs) comes from SIDIS measurements with unpolarised and polarised beams and targets where they appear convoluted with fragmentation functions (FFs). Drell-Yan (DY) measurements are complementary to those by SIDIS experiments, as they allow to measure convolutions of only Parton Distribution Functions (PDFs) without involving FFs. Moreover, given the T-odd character of both Sivers and Boer-Mulders functions, the sign of these TMDs is expected to be reversed when observed from SIDIS or from DY. Measurements of SIDIS were performed by Compass in the period 2002 to 2007 and in 2010, using a naturally polarised μ+ beam and a solid state target polarised either longitudinally or transversely with respect to the beam direction. Now the COMPASS Experiment has the unique opportunity to access TMDs from single-polarised Drell-Yan processes as well, in the same kinematical domain of the SIDIS data and with the same experimental setup; it will allow to test the TMDs universality and the sign change prediction for the first time. We present here the upcoming polarised DY measurements at COMPASS
Copyright/License	CC-BY-4.0

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