IPM
30
YEARS OLD

## “School of Particles”

Paper   IPM / Particles / 11629
School of Particles and Accelerator
Title: Upsilon Production Cross-Section in pp Collisions at sqrts=7 TeV
Author(s):
 1 . Hessamaddin Arfaei 2 . Hamed Bakhshiansohi 3 . Seyed Mohsen Etesami 4 . Ali Fahim 5 . Majid Hashemi 6 . Abideh Jafari 7 . Mohsen Khakzad 8 . A Mohammadi 9 . Mojtaba Mohammadi Najafabadi 10 . Saeid Paktinat Mehdiabadi 11 . Batool Safarzadeh 12 . Maryam Zeinali
Status: Published
Journal: Phys. Rev. D
No.: 112004
Vol.: 83
Year: 2011
Supported by: IPM
Abstract:
The Upsilon production cross section in proton-proton collisions at sqrt(s) = 7 TeV is measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 3.1 +/- 0.3 inverse picobarns. Integrated over the rapidity range - y - <2, we find the product of the Upsilon(1S) production cross section and branching fraction to dimuons to be sigma(pp to Upsilon(1S) X) B(Upsilon(1S) to mu+ mu-) = 7.37 +/- 0.13^+0.61_-0.42 0.81 nb, where the first uncertainty is statistical, the second is systematic, and the third is associated with the estimation of the integrated luminosity of the data sample. This cross section is obtained assuming unpolarized Upsilon(1S) production. If the Upsilon(1S) production polarization is fully transverse or fully longitudinal the cross section changes by about 20