ϒ(nS) Polarizations Versus Particle Multiplicity In pp Collisions At s=7 TeV

Authors

M M. Baarmand, Florida Institute of Technology
Vallary Bhopatkar, Florida Institute of Technology
Stefano Colafranceschi, Florida Institute of Technology
Marcus Hohlmann, Florida Institute of Technology
H Kalakhety, Florida Institute of Technology
D Noonan, Florida Institute of Technology
Tuhin S. Roy, Florida Institute of Technology
Francisco X. Yumiceva, Florida Institute of Technology
CMS Collaboration

Document Type

Article

Publication Title

Physics Letters B

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=7 TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS) transverse momentum (10–15 and 15–35 GeV), 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.

DOI

10.1016/j.physletb.2016.07.065

Publication Date

2016

Recommended Citation

Baarmand, M M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Kalakhety, H; Noonan, D; Roy, Tuhin S.; Yumiceva, Francisco X.; and CMS Collaboration, "ϒ(nS) Polarizations Versus Particle Multiplicity In pp Collisions At s=7 TeV" (2016). Aerospace, Physics, and Space Science Faculty Publications. 114.
https://repository.fit.edu/apss_faculty/114