Measurement of the Relative Prompt Production Rate of $\chi_{c2}$ and $\chi_{c1}$ in $pp$ Collisions at $\sqrt{s}=7$ TeV - INSPIRE

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Measurement of the Relative Prompt Production Rate of $\chi_{c2}$ and $\chi_{c1}$ in $pp$ Collisions at $\sqrt{s}=7$ TeV

CMS

Collaboration

Oct, 2012

33 pages

Published in:

Eur.Phys.J.C 72 (2012) 2251

Published: Dec 14, 2012

e-Print:

1210.0875 [hep-ex]

DOI:

10.1140/epjc/s10052-012-2251-3

Report number:

CMS-BPH-11-010,
CERN-PH-EP-2012-271

Experiments:

CERN-LHC-CMS

View in:

reference search88 citations

Citations per year

Abstract: (arXiv)

A measurement is presented of the relative prompt production rate of chi(c2) and chi(c1) with 4.6 inverse femtobarns of data collected by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV. The two states are measured via their radiative decays chi(c) to J/psi + gamma, with the photon converting into a dielectron pair for J/psi rapidity abs(y(J/psi)) < 1.0 and photon transverse momentum pt(gamma) > 0.5 GeV. The measurement is given for six intervals of pt(J/psi) between 7 and 25 GeV. The results are compared to theoretical predictions.

Note:

Replaced with published version. Included journal reference and DOI

p p: scattering
chi mesons: radiative decay
channel cross section: ratio: measured
CMS
chi/c1(3510): direct production
chi/c2(3555): direct production
channel cross section: branching ratio
J/psi(3100): transverse momentum
transverse momentum: dependence
chi mesons: polarization

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