In CDF we have observed the reactions p + (p) over bar -> p + X + (p) over bar, with X being a centrally produced J/psi, psi(2S), or chi(c0), and gamma gamma -> mu(+)mu(-) in p (p) over bar collisions at root s = 1.96 TeV. The event signature requires two oppositely charged central muons, and either no other particles or one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, gamma + p -> J/psi(psi(2S)) + p, observed here for the first time in hadron-hadron collisions. We also observe exclusive chi(c0) -> J/psi + gamma. The cross sections d sigma/dy|(y=0) for J/psi, psi(2S), and chi(c0) are (3.92 +/- 0.25(stat) +/- 0.52(syst)) nb, (0.53 +/- 0.09(stat) +/- 0.10(syst)) nb, and (76 +/- 10(stat) +/- 10(syst)) nb, respectively, and the continuum is consistent with QED. We put an upper limit on the cross section for Odderon exchange in exclusive J/psi production.

Observation of Exclusive Charmonium Production and gamma gamma -> mu(+)mu(-) in p(p)over-bar Collisions at root s=1.96 TeV

CIOCCI, MARIA AGNESE;DONATI, SIMONE;PUNZI, GIOVANNI;
2009-01-01

Abstract

In CDF we have observed the reactions p + (p) over bar -> p + X + (p) over bar, with X being a centrally produced J/psi, psi(2S), or chi(c0), and gamma gamma -> mu(+)mu(-) in p (p) over bar collisions at root s = 1.96 TeV. The event signature requires two oppositely charged central muons, and either no other particles or one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, gamma + p -> J/psi(psi(2S)) + p, observed here for the first time in hadron-hadron collisions. We also observe exclusive chi(c0) -> J/psi + gamma. The cross sections d sigma/dy|(y=0) for J/psi, psi(2S), and chi(c0) are (3.92 +/- 0.25(stat) +/- 0.52(syst)) nb, (0.53 +/- 0.09(stat) +/- 0.10(syst)) nb, and (76 +/- 10(stat) +/- 10(syst)) nb, respectively, and the continuum is consistent with QED. We put an upper limit on the cross section for Odderon exchange in exclusive J/psi production.
2009
T., Aaltonen; J., Adelman; T., Akimoto; M. G., Albrow; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828485
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