Elsevier

Nuclear Physics B

Volume 107, Issue 3, 17 May 1976, Pages 429-456
Nuclear Physics B

Structure of final states with a high transverse momentum π0 in proton-proton collisions

https://doi.org/10.1016/0550-3213(76)90146-2Get rights and content

Abstract

We present a study of the final state structure in proton-proton collisions (√s = 53 GeV) where a large transverse momentum π0 (pt > 2 GeV/c) is produced at an angle of 90°. Charged secondaries have been detected and momentum analysed in the split field magnet detector at the CERN Intersecting Storage Rings. The large angular coverage of this detector extends over ±2.5 units of rapidity and ±30° of azimuth with respect to the trigger π0, both towards and away from it. In each of these directions, where we observe similar strong correlations, we present charged particle distributions, in rapidity and momentum. In the hemisphere containing the trigger π0 we have measured the cross section for inclusive production of large transverse momentum ϱ± mesons. In the opposite hemisphere the data exhibit several features predicted by hard scattering quark-parton models: coplanarity and short-range rapidity correlation for the large transverse momentum secondaries as well as a transverse momentum sharing distribution similar to that observed in deep inelastic electro-production and in e+e collisions.

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Visitor from III. Physikalisches Institut der Technischen Hochschule, Aachen, Germany.

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Present address: Enrico Fermi Institute, University of Chicago, Chicago, Ill. 60637, USA.

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Visitor from Institut für Hochenergiephysik, Heidelberg, Germany.

Present address: Istituto di Fisica dell Università, Bologna, Italy.

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Present address: University of California, Santa Cruz, Cal. 95064, USA.

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Visiting Scientist from JINR, Dubna, USSR, on leave from Central Research Institute for Physics, Budapest, Hungary.

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