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Observation of Events with an Energetic Forward Neutron in Deep Inelastic Scattering at HERA

ArXiv hep-ex/9606006 (1996)

Authors:

ZEUS Collaboration, M Derrick et al
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Measurement of elastic φ photoproduction at HERA

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 377:4 (1996) 259-272

Authors:

M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, JR Okrasinski, J Repond, R Stanek, RL Talaga, H Zhang, MCK Mattingly, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, R Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, M Corradi, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Polini, G Sartorelli, Y Zamora Garcia, A Zichichi, A Bornheim, J Crittenden, T Doeker, M Eckert, L Feld, A Frey, M Geerts, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, HP Jakob, UF Katz, S Mengel, J Mollen, E Paul, M Pfeiffer, C Rembser, D Schramm, J Stamm, R Wedemeyer, S Campbell-Robson, A Cassidy, WN Cottingham, N Dyce, B Foster, S George, ME Hayes, GP Heath, HF Heath, D Piccioni, DG Roff, RJ Tapper, R Yoshida, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, A Caldwell, N Cartiglia, Z Jing, W Liu, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, M Zachara, L Zawiejski, L Adamczyk, B Bednarek, K Jeleń, D Kisielewska, T Kowalski

Abstract:

The production of φ mesons in the reaction e+p → e+φp (φ → K+K-) at a median Q2 of 10-4 GeV2 has been studied with the ZEUS detector at HERA. The differential φ photoproduction cross section dσ/dt has an exponential shape and has been determined in the kinematic range 0.1 < |t| < 0.5 GeV2 and 60 < W < 80 GeV. An integrated cross section of σγp→φp = 0.96 ± 0.19+0.21-.18 μb has been obtained by extrapolating to t = 0. When compared to lower energy data, the results show a weak energy dependence of both σγp→φp and the slope of the t distribution. The φ decay angular distributions are consistent with s-channel helicity conservation. From lower energies to HERA energies, the features of φ photoproduction are compatible with those of a soft diffractive process.
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Test stand for the Silicon Vertex Detector of the Collider Detector Facility

IEEE Transactions on Nuclear Science Institute of Electrical and Electronics Engineers (IEEE) 43:3 (1996) 1170-1174

Authors:

S Zimmermann, J Anderson, J Andresen, E Barsotti, J Chramowicz, G Duerling, M Gao, H Gonzalez, B Haynes, W Knopf, K Treptow, D Walsh, T Zmuda, T Huffman, P Shepard, C Gay, S Harder, H Hill, J Huth, J O'Kane, J Oliver, H Robins, M Spiropulu, R Strohmer, M Gold, T Thomas
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Dijet Angular Distributions in Direct and Resolved Photoproduction at HERA

ArXiv hep-ex/9605009 (1996)
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Further Properties of High-Mass Multijet Events at the Fermilab Proton-Antiproton Collider

ArXiv hep-ex/9605004 (1996)
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