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Production of chi(c1) and chi(c2) in pp collisions at sqrt[S] = 1.8 TeV |
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| Authors: | Affolder T Akimoto H Akopian A Albrow M G Amaral P Amendolia S R Amidei D Anikeev K Antos J Apollinari G Arisawa T Asakawa T Ashmanskas W Azfar F Azzi-Bacchetta P Bacchetta N Bailey M W Bailey S de Barbaro P Barbaro-Galtieri A Barnes V E Barnett B A Baroiant S Barone M Bauer G Bedeschi F Belforte S Bell W H Bellettini G Bellinger J Benjamin D Bensinger J Beretvas A Berge J P Berryhill J Bevensee B Bhatti A Binkley M Bisello D Bishai M Blair R E Blocker C Bloom K Blumenfeld B Blusk S R Bocci A Bodek A Bokhari W Bolla G Bonushkin Y Bortoletto D Boudreau J Brandl A van den Brink S Bromberg C |
| Institution: | Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. |
| Abstract: | We have measured the ratio of prompt production rates of the charmonium states chi(c1) and chi(c2) in 110 pb(-1) of pp collisions at sqrts] = 1.8 TeV. The photon from their decay into J/psi(gamma) is reconstructed through conversion into e+e- pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma(chi(c2))/sigma(chi(c1)) = 0.96+/-0.27(stat)+/-0.11(syst) for events with pT(J/psi) > 4.0 GeV/c, /eta(J/psi)/ < 0.6, and pT(gamma) > 1.0 GeV/c. |
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