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 |
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Format: | Artikel |
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. |
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ISSN: | 0370-2693 |