Rapidity and Transverse Momentum Dependence of Inclusive J/psi Production in pp Collisions at s = 7 TeV
- University of Oslo, Norway
- ORNL
- University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
The ALICE experiment at the LHC has studied inclusive J/{Psi} production at central and forward rapidities in pp collisions at {radical}s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/{Psi} through the dilepton decay into e{sup +}e{sup -} and {mu}{sup +}{mu}{sup -} pairs in the rapidity ranges |y| < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero p{sub T}. In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity L{sub int} = 5.6 nb{sup -1} and the number of signal events is N{sub J/{Psi}} = 352 {+-} 32 (stat.) {+-} 28 (syst.); the corresponding figures in the dimuon channel are L{sub int} = 15.6 nb{sup -1} and N{sub J/{Psi}} = 1924 {+-} 77 (stat.) {+-} 144 (syst.). The measured production cross sections are {sigma}{sub J/{Psi}} (|y| < 0.9) = 10.7 {+-} 1.0 (stat.) {+-} 1.6 (syst.){sub -2.3}{sup +1.6} (syst.pol.) {mu}b and {sigma}{sub J/{Psi}} (2.5 < y < 4) = 6.31 {+-} 0.25 (stat.) {+-} 0.76 (syst.){sub -1.96}{sup +0.95} (syst.pol.) mb. The differential cross sections, in transverse momentum and rapidity, of the J/{Psi} were also measured.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1042844
- Journal Information:
- Physics Letters B, Vol. 704, Issue 5; ISSN 0370-2693
- Country of Publication:
- United States
- Language:
- English
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