A study of the fragmentation of quarks in et-p collisions at HERA |
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| Affiliation: | 1. Ruđer Bošković Institute, Center for Marine Research, G. Paliage 5, 52210 Rovinj, Croatia;2. Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, Croatia;3. Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Oceanography section, via Auguste Piccard 54, 34151 Trieste, Italy;4. National Research Council, Institute of Marine Sciences, Arsenale Tesa 104 Castello 2737/f, 30122 Venice, Italy;5. National Research Council, Institute of Marine Sciences, Largo Fiera della Pesca 2, 60125 Ancona, Italy;6. Agricultural University of Tirana, Kodër Kamëz, SH1, 1000 Tirana, Albania;7. University of Dubrovnik, Institute for Marine and Coastal Research, Kneza Damjana Jude 12, 20000 Dubrovnik, Croatia;8. University of Montenegro, Institute of Marine Biology, Dobrota bb, 85330 Kotor, Montenegro;9. National Institute of Biology, Marine Biology Station, Fornače 41, 6330 Piran, Slovenia;10. Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička 54, 10000 Zagreb, Croatia;11. The University of Western Australia, School of Civil, Environmental and Mining Engineering & UWA Oceans Institute, Crawley, WA 6009, Australia;12. Institute for Environmental Protection and Research, Via Vitaliano Brancati 48, 00144 Rome, Italy;13. University of Dubrovnik, Department of Aquaculture, Ćira Carića 4, 20000 Dubrovnik, Croatia;1. Department of Urology, First Affiliated Hospital of Xi''an Jiaotong University, Xi''an 710061, China;2. Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;1. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;2. South Valley University, Faculty of Science, Chemistry Department, 83523 Qena, Egypt |
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| Abstract: | Deep inelastic scattering (DIS) events, selected from 1993 data taken by the H1 experiment at HERA, are studied in the Breit frame of reference. The fragmentation function of the quark is compared with those of e+e− data. It is shown that certain aspects of the quarks emerging from within the proton in e−p interactions are essentially the same as those of quarks pair-created from the vacuum in e+e− annihilation. The measured area, peak position and width of the fragmentation function show that the kinematic evolution variable, equivalent to the e+e− squared centre of mass energy, is in the Breit frame the invariant square of the four-momentum transfer. We comment on the extent to which we have evidence for coherence effects in pArton showers. |
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