The polarizations of the ϒ(1S), ϒ(2S), and ϒ(3S)mesons are measured as a function of the charged particle multiplicity in proton–proton collisions at √s=7TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS)transverse momentum (10–15 and 15–35GeV), and in the rapidity interval |y| <1.2. The results do not show significant changes from low-to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the ϒ(2S)and ϒ(3S)cases.

ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV

Sola, V.;AMAPANE, Nicola Carlo;ARCIDIACONO, Roberta;ARGIRO', Stefano;ARNEODO, Michele;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;FINCO, LINDA;KIANI, Muhammad Bilal Manzoor;MIGLIORE, Ernesto;MONACO, Vincenzo;MONTEIL, ENNIO;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;RUSPA, Marta;SACCHI, Roberto;SOLANO, Ada Maria;
2016-01-01

Abstract

The polarizations of the ϒ(1S), ϒ(2S), and ϒ(3S)mesons are measured as a function of the charged particle multiplicity in proton–proton collisions at √s=7TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS)transverse momentum (10–15 and 15–35GeV), and in the rapidity interval |y| <1.2. The results do not show significant changes from low-to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the ϒ(2S)and ϒ(3S)cases.
2016
761
31
52
http://www.sciencedirect.com/science/journal/03702693
CMS; Physics; QCD medium effects; Quarkonium polarization; Quarkonium production; Nuclear and High Energy Physics
Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Fabjan, C...espandi
File in questo prodotto:
File Dimensione Formato  
j.physletb.2016.07.065.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 790.93 kB
Formato Adobe PDF
790.93 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1639810
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 6
social impact