Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt = 1.96 TeV

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Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H & Osterberg , K 2009 , ' Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV ' , Physical Review Letters , vol 102 , pp. 242001 .

Title: Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV
Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Maki, T.; Saarikko, H.; Osterberg, K.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics (HIP) (-2009)
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Belongs to series: Physical Review Letters
ISSN: 0031-9007
Abstract: We have observed the reactions p+pbar --> p+X+pbar, with X being a centrally produced J/psi, psi(2S) or chi_c0, and gamma+gamma --> mu+mu-, in proton- antiproton collisions at sqrt{s} = 1.96 TeV using the Run II Collider Detector at Fermilab. The event signature requires two oppositely charged muons, each with pseudorapidity |eta| mu+mu-. Events with a J/psi and an associated photon candidate are consistent with exclusive chi_c0 production through double pomeron exchange. The exclusive vector meson production is as expected for elastic photo- production, gamma+p --> J/psi(psi(2S)) + p, which is observed here for the first time in hadron-hadron collisions. The cross sections ds/dy(y=0) for p + pbar --> p + X + pbar with X = J/psi, psi(2S) orchi_c0 are 3.92+/-0.62 nb, 0.53+/-0.14 nb, and 75+/-14 nb respectively. The cross section for the continuum, with |eta(mu+/-)|
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/23667
Date: 2009
Subject: hep-ex
114 Physical sciences


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