CMS-PAS-BPH-12-006

CMS-PAS-BPH-12-006
$\Upsilon$ (1S), $\Upsilon$ (2S) and $\Upsilon$ (3S) cross section measurements in pp collisions at $\sqrt{s} =$ 7 TeV
CMS Collaboration
2013

Abstract: The differential cross section as a function of transverse momentum for the production of the $\Upsilon(nS)$ ( $n$ =1,2,3) states decaying into a pair of muons has been measured in pp collisions at $\sqrt{s}$ = 7 TeV using 4.9 fb $^{-1}$ of data collected by the CMS detector. The analysis selected events with dimuon rapidity $\|y(\mu\mu)\|$ 0.6, and the measurements cover dimuon transverse momentum in the range $p_T(\mu\mu)=$ 10-100 GeV. The data show a transition from exponential to power-law behavior in the neighborhood of 20 GeV, and the power-law exponents for all three states are consistent. The ratio of differential cross sections for higher- $n$ S-wave relative to lower- $n$ S-wave states rises at low $p_T(\mu\mu)$ , then becomes flatter at higher $p_T(\mu\mu)$ where the power-law behavior dominates.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; Figures are available from the CDS record. These preliminary results are superseded in this paper, PLB 749 (2015) 14.

Compact Muon Solenoid
LHC, CERN