Nuclear dependence of light neutral meson production in p–A collisions at 400 GeV with NA60

Autor: Pierre Jarron, H. J. Specht, P. Rosinsky, R. Arnaldi, P. Ramalhete, A. Devaux, J. Seixas, J. Lozano, B. Chaurand, T. Poghosyan, Raphael Noel Tieulent, A. Neves, P. Force, G. Puddu, Hiroaki Ohnishi, H. En'yo, A. Uras, Sergio Serci, A. Colla, Enrico Scomparin, P. Parracho, N. Guettet, Alessandro Ferretti, P. Martins, K. Borer, Giulio Usai, Laurent Ducroux, R. Veenhof, J. Fargeix, C. Oppedisano, Michele Floris, R. Shahoyan, Wen-Chang Chen, S. Damjanovic, P. Pillot, A. Masoni, J. M. Heuser, P. Sonderegger, H. K. Wöhri, A. Förster, E. Radermacher, Z. Li, M. Keil, J. Castor, A. Guichard, L. Kluberg, C. Lourenço, Pietro Cortese, Corrado Cicalo, A. De Falco, H. Gulkanian, Franck Manso, K. Banicz, A. David
Přispěvatelé: Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA60, Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
NA60
Particle physics
Physics and Astronomy (miscellaneous)
Meson
Proton
Nuclear Theory
FOS: Physical sciences
cross section: ratio
lcsh:Astrophysics
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
01 natural sciences
Power law
omega(783): decay
Computer Science::Digital Libraries
Spectral line
High Energy Physics - Experiment
transverse momentum: momentum spectrum
High Energy Physics - Experiment (hep-ex)
0103 physical sciences
lcsh:QB460-466
Nuclear Physics - Experiment
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
meson: production
Nuclear Experiment (nucl-ex)
010306 general physics
Nuclear Experiment
Engineering (miscellaneous)
p nucleus: scattering
Physics
Muon
010308 nuclear & particles physics
Sigma
dimuon: mass spectrum
p: beam
CERN SPS
eta(958): decay
muon: pair production
Pair production
lcsh:QC770-798
Production (computer science)
High Energy Physics::Experiment
Phi(1020): decay
Zdroj: European Physical Journal
Eur.Phys.J.C
Eur.Phys.J.C, 2019, 79 (5), pp.443. ⟨10.1140/epjc/s10052-019-6848-7⟩
European Physical Journal C: Particles and Fields, Vol 79, Iss 5, Pp 1-13 (2019)
DOI: 10.1140/epjc/s10052-019-6848-7⟩
Popis: The NA60 experiment has studied low-mass muon pair production in proton–nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the $$\rho /\omega $$ ρ/ω and $$\phi $$ ϕ mesons are measured in the full $$p_{\mathrm {T}}$$ pT range accessible, from $$p_{\mathrm {T}}= 0$$ pT=0 up to $$2 \, {\hbox {GeV/c}}$$ 2GeV/c . The nuclear dependence of the production cross sections of the $$\eta $$ η , $$\omega $$ ω and $$\phi $$ ϕ mesons has been found to be consistent with the power law $$\sigma _{\mathrm {pA}} \propto {\mathrm {A}}^\alpha $$ σpA∝Aα , with the $$\alpha $$ α parameter increasing as a function of $$p_{\mathrm {T}}$$ pT for all the particles, and an approximate hierarchy $$\alpha _\eta \approx \alpha _\phi > \alpha _\omega $$ αη≈αϕ>αω . The cross section ratios $$\sigma _\eta /\sigma _\omega $$ ση/σω , $$\sigma _\rho /\sigma _\omega $$ σρ/σω and $$\sigma _\phi /\sigma _\omega $$ σϕ/σω have been studied as a function of the size A of the production target, and an increase of the $$\eta $$ η and $$\phi $$ ϕ yields relative to the $$\omega $$ ω is observed from p–Be to p–U collisions.
Databáze: OpenAIRE
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