Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV
| Contribuinte(s) |
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 |
|---|---|
| Data(s) |
2009
|
| Resumo |
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+/-)| |
| Formato |
7 |
| Identificador |
http://hdl.handle.net/10138/23667 0031-9007 |
| Idioma(s) |
eng |
| Publicador |
American Institute of Physics |
| Relação |
Physical Review Letters |
| Fonte |
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 . |
| Palavras-Chave | #hep-ex #114 Physical sciences |
| Tipo |
A1 Refereed journal article document info:eu-repo/semantics/article |
