Production of bosons in elastic and quasi-elastic ep collisions at HERA

The production of Z 0 bosons in the reaction e p a e Z 0 p (a) , where p (a) stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS detector. The analysis is based on a data sample collected between 1996 and 2007, amounting to 496 pb - 1 of inte...

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Veröffentlicht in:Physics letters. B 2013-01, Vol.718 (3), p.915-921
Hauptverfasser: Abramowicz, H, Abt, I, Adamczyk, L, Adamus, M, Aggarwal, R, Antonelli, S, Antonioli, P, Antonov, A, Arneodo, M, Arslan, O, Aushev, V, Aushev, Y, Bachynska, O, Bamberger, A, Barakbaev, AN, Barbagli, G, Bari, G, Barreiro, F, Bartosik, N, Bartsch, D, Basile, M, Behnke, O, Behr, J, Behrens, U, Bellagamba, L, Bertolin, A, Bhadra, S, Bindi, M, Blohm, C, Bokhonov, V, Bold, T, Bondarenko, K, Boos, E G, Borras, K, Boscherini, D, Bot, D, Brock, I, Brownson, E, Brugnera, R, Bruemmer, N, Bruni, A, Bruni, G, Brzozowska, B, Bussey, P J, Bylsma, B, Caldwell, A, Capua, M, Carlin, R, Catterall, C D, Chekanov, S, et. al
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Sprache:eng
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Zusammenfassung:The production of Z 0 bosons in the reaction e p a e Z 0 p (a) , where p (a) stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS detector. The analysis is based on a data sample collected between 1996 and 2007, amounting to 496 pb - 1 of integrated luminosity. The Z 0 was measured in the hadronic decay mode. The elasticity of the events was ensured by a cut on IDT max < 3.0 , where IDT max is the maximum pseudorapidity of energy deposits in the calorimeter defined with respect to the proton beam direction. A signal was observed at the Z 0 mass. The cross section of the reaction e p a e Z 0 p (a) was measured to be I (e p a e Z 0 p (a)) = 0.13 +/- 0.06 (stat.) +/- 0.01 (syst.) pb , in agreement with the Standard Model prediction of 0.16 pb. This is the first measurement of Z 0 production in ep collisions.
ISSN:0370-2693