https://doi.org/10.1140/epjc/s10052-006-0028-2
Experimental Physics
Tau lepton production in ep collisions at HERA
1
I. Physikalisches Institut, RWTH, Aachen, Germany
2
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
3
Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
4
Universiteit Antwerpen, Antwerpen, Belgium
5
Rutherford Appleton Laboratory, Chilton, Didcot, UK
6
Institute for Nuclear Physics, Cracow, Poland
7
Institut für Physik, Universität Dortmund, Dortmund, Germany
8
Joint Institute for Nuclear Research, Dubna, Russia
9
CEA, DSM/DAPNIA, CE-Saclay, Gif-sur-Yvette, France
10
DESY, Hamburg, Germany
11
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
12
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
13
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
14
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
15
Institut für Experimentelle und Angewandte Physik, Universität Kiel, Kiel, Germany
16
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
17
Department of Physics, University of Lancaster, Lancaster, UK
18
Department of Physics, University of Liverpool, Liverpool, UK
19
Queen Mary and Westfield College, London, UK
20
Physics Department, University of Lund, Lund, Sweden
21
Physics Department, University of Manchester, Manchester, UK
22
CPPM, CNRS/IN2P3, Univ. Mediterranee, Marseille, France
23
Departamento de Fisica Aplicada, CINVESTAV, Merida, Yucatan, Mexico
24
Departamento de Fisica, CINVESTAV, Merida, Mexico
25
Institute for Theoretical and Experimental Physics, Moscow, Russia
26
Lebedev Physical Institute, Moscow, Russia
27
Max-Planck-Institut für Physik, München, Germany
28
LAL, Université de Paris-Sud 11, IN2P3-CNRS, Orsay, France
29
LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
30
LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
31
Faculty of Science, University of Montenegro, Podgorica, Serbia and Montenegro
32
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
33
Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
34
Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy
35
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
36
Paul Scherrer Institut, Villigen, Switzerland
37
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
38
Yerevan Physics Institute, Yerevan, Armenia
39
DESY, Zeuthen, Germany
40
Institut für Teilchenphysik, ETH, Zürich, Switzerland
41
Physik-Institut, Universität Zürich, Zürich, Switzerland
42
Physics Department, National Technical University, Zografou Campus, 15773, Athens, Greece
43
Rechenzentrum, Universität Wuppertal, Wuppertal, Germany
44
University of P.J. Šafárik, Košice, Slovak Republic
45
CERN, Geneva, Switzerland
46
Max-Planck-Institut für Physik, München, Germany
47
Comenius University, Bratislava, Slovak Republic
* e-mail: eperez@hep.saclay.cea.fr
Received:
13
April
2006
Revised:
20
July
2006
Published online:
24
October
2006
The production of tau leptons in ep collisions is investigated using data recorded by the H1 detector at HERA in the period 1994–2000. Tau leptons are identified by detecting their decay products, using leptonic and hadronic decay modes. The cross section for the production of tau lepton pairs is measured for the first time at HERA. Furthermore, a search for events with an energetic isolated tau lepton and with large missing transverse momentum is performed. The results are found to be in agreement with the Standard Model predictions.
© Springer-Verlag Berlin Heidelberg, 2006