J-\psi Production via \chi_c Decays in 920 GeV pA Interactions

The HERA-B Collaboration,B. Bobchenko,M. Bocker,A. Bogatyrev,G. Bohm,C. Borgmeier,M. Brauer,D. Broemmelsiek,M. Bruinsma, M. Bruschi, P. Buchholz,M. Buchler, T. Buran,M. Capeans, M. Capponi,J. Carvalho,J. Chamanina,B. X. Chen,R. Chistov,M. Chmeissani,A. Christensen,P. Conde,C. Cruse,M. Dam,K. M. Danielsen,M. Danilov,S. De Castro,H. Deckers,K. Dehmelt,H. Deppe,B. Dolgoshein,X. Dong,H. B. Dreis,M. Dressel, D. Dujmic,R. Eckmann,V. Egorytchev,K. Ehret,V. Eiges, F. Eisele

Physics Letters B（2003）

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摘要

Using data collected by the HERA-B experiment, we have measured the fraction of J/ψ's produced via radiative χc decays in interactions of 920 GeV protons with carbon and titanium targets. We obtained Rχc=0.32±0.06stat±0.04sys for the fraction of J/ψ from χc decays averaged over proton–carbon and proton–titanium collisions. This result is in agreement with previous measurements and is compared with theoretical predictions.

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data collection,titanium

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