In CDF we have observed the reactions p+p̄→p+X+p̄, with X being a centrally produced J/ψ, ψ(2S), or χc0, and γγ→μ+μ- in pp̄ collisions at s=1.96TeV. 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, γ+p→J/ψ(ψ(2S))+p, observed here for the first time in hadron-hadron collisions. We also observe exclusive χc0→J/ψ+γ. The cross sections dσdy|y=0 for J/ψ, ψ(2S), and χc0 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/ψ production. © 2009 The American Physical Society.

Observation of exclusive charmonium production and γγ→μ +μ- in pp̄ collisions at s=1.96TeV / Aaltonen T., Adelman J., Akimoto T., Albrow M.G., Alvarez Gonzalez B., Amerio S., Amidei D., Anastassov A., Annovi A., Antos J., Apollinari G., Apresyan A., Arisawa T., Artikov A., Ashmanskas W., Attal A., Aurisano A., Azfar F., Azzurri P., Badgett W., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 102:(2009), pp. 0-0. [10.1103/PhysRevLett.102.242001]

Observation of exclusive charmonium production and γγ→μ +μ- in pp̄ collisions at s=1.96TeV

Latino G.;
2009

Abstract

In CDF we have observed the reactions p+p̄→p+X+p̄, with X being a centrally produced J/ψ, ψ(2S), or χc0, and γγ→μ+μ- in pp̄ collisions at s=1.96TeV. 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, γ+p→J/ψ(ψ(2S))+p, observed here for the first time in hadron-hadron collisions. We also observe exclusive χc0→J/ψ+γ. The cross sections dσdy|y=0 for J/ψ, ψ(2S), and χc0 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/ψ production. © 2009 The American Physical Society.
2009
102
0
0
Aaltonen T.; Adelman J.; Akimoto T.; Albrow M.G.; Alvarez Gonzalez B.; Amerio S.; Amidei D.; Anastassov A.; Annovi A.; Antos J.; Apollinari G.; Apresy...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1195795
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