2022 Impact factor 4.4
Particles and Fields
Eur. Phys. J. C 17, 567-581
DOI 10.1007/s100520000503

A search for excited fermions at HERA

The H1 Collaboration

C. Adloff33 - et al.

33 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany

Received: 19 July 2000 / Published online: 23 October 2000 - © Springer-Verlag 2000

A search for excited fermions ${\tt f^*}$ of the first generation in e+p scattering at the collider HERA is presented using H1 data with an integrated luminosity of 37 pb-1. All electroweak decays of excited fermions, ${\tt f^*} \rightarrow {\tt f} \gamma, {\tt f} W, {\tt f} Z$ are considered and all possible final states resulting from the Z or W hadronic decays or decays into leptons of the first two generations are taken into account. No evidence for ${\tt f^*}$ production is found. Mass dependent exclusion limits on cross-sections and on the ratio of coupling constants to the compositeness scale are derived.

Copyright Società Italiana di Fisica, Springer-Verlag 2000