CERN Accelerating science

Article
Title	LHCspin: a polarized internal target for the LHC
Author(s)	Lenisa, Paolo (Ferrara U. ; INFN, Ferrara) ; Steffens, Erhard (Erlangen - Nuremberg U.) ; Carassiti, Vito (INFN, Ferrara ; Ferrara U.) ; Ciullo, Giuseppe (Ferrara U. ; INFN, Ferrara) ; Di Nezza, Pasquale (Frascati) ; Pappalardo, Luciano (Ferrara U. ; INFN, Ferrara) ; Vasilyev, Alexander A (PNPI, CSTD)
Publication	SISSA, 2020
Number of pages	10
In:	PoS PSTP2019 (2020) 025
In:	18th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP 2019), Knoxville, United States, 23 - 27 Sep 2019, pp.025
DOI	10.22323/1.379.0025
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	The LHCspin project aims to bring both unpolarized and polarized physics at the LHC through the installation of a gaseous fixed target at the upstream end of the LHCb detector. The forward geometry of the LHCb spectrometer (2 < eta < 5) is perfectly suited for the reconstruction of particles produced in fixed-target collisions. The fixed-target configuration, with center-of-mass energies ranging from sqrt(s) = 72 GeV in collisions with Pb beams tosqrt(s) = 115 GeV in pp interactions, allows to cover a wide backward center-of-mass rapidity region, corresponding to the poorly explored high x-Bjorken and high x-Feynman regimes. The use of transversely polarized H andD targets will allow to study the quarks TMDs in p-p collisions at unique kinematic conditions. Furthermore, being LHCb specifically designed for heavy-flavor physics, final states with c- or b-quarks (e.g. inclusive quarkonia production) will be efficiently reconstructed, thus providing, among other fundamental measurememnts, access to the so-far unknown gluons TMDs. The contribution focuses on the design considerations of the polarized internal target and on a discussion of possible critical machine issues.
Copyright/License	© 2020-2025 The author(s) (License: CC-BY-NC-ND-4.0)

Corresponding record in: Inspire