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Abstract
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.
Details
1 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
2 Lebedev Physical Institute, Moscow, Russia (GRID:grid.425806.d) (ISNI:0000000106566476)
3 Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium (GRID:grid.4989.c) (ISNI:0000000123480746); Universiteit Antwerpen, Antwerpen, Belgium (GRID:grid.5284.b) (ISNI:0000000107903681)
4 Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000000123750603)
5 Università di Roma Tre and INFN Roma 3, Dipartimento di Fisica, Roma, Italy (GRID:grid.8509.4) (ISNI:0000000121622106)
6 Institute for Theoretical and Experimental Physics, Moscow, Russia (GRID:grid.21626.31) (ISNI:0000000101258159)
7 University of Montenegro, Faculty of Science, Podgorica, Serbia and Montenegro (GRID:grid.12316.37) (ISNI:0000000121820188)
8 Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000000404827128)
9 LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France (GRID:grid.433124.3) (ISNI:0000000106643574)
10 LAL, Université de Paris-Sud 11, IN2P3-CNRS, Orsay, France (GRID:grid.4444.0) (ISNI:0000000121129282)
11 ETH, Institut für Teilchenphysik, Zürich, Switzerland (GRID:grid.5801.c) (ISNI:0000000121562780)
12 Universität Zürich, Physik-Institut, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000000419370650)
13 Universität Heidelberg, Physikalisches Institut, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000000121904373)
14 Universität Dortmund, Institut für Physik, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000000104169637)
15 LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France (GRID:grid.4444.0) (ISNI:0000000121129282)
16 Slovak Academy of Sciences, Institute of Experimental Physics, Košice, Slovak Republic (GRID:grid.419303.c) (ISNI:0000000121809405)
17 Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany (GRID:grid.9026.d) (ISNI:0000000122872617)
18 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000000122886103); Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000000404827128)
19 Univ. Mediterranee, CPPM, CNRS/IN2P3, Marseille, France (GRID:grid.5399.6) (ISNI:0000 0001 2176 4817)
20 Charles University, Faculty of Mathematics and Physics, Praha, Czech Republic (GRID:grid.4491.8) (ISNI:000000041937116X)
21 Slovak Academy of Sciences, Institute of Experimental Physics, Košice, Slovak Republic (GRID:grid.419303.c) (ISNI:0000000121809405); Comenius University, Bratislava, Slovak Republic (GRID:grid.7634.6) (ISNI:0000000109409708)
22 CINVESTAV, Departamento de Fisica Aplicada, Merida, Mexico (GRID:grid.418275.d) (ISNI:0000000121658782)
23 Rutherford Appleton Laboratory, Chilton, Didcot, UK (GRID:grid.76978.37) (ISNI:0000000122966998)
24 University of Manchester, Physics Department, Manchester, UK (GRID:grid.5379.8) (ISNI:0000000121662407)
25 CEA, DSM/DAPNIA, CE-Saclay, Gif-sur-Yvette, France (GRID:grid.457334.2)
26 Academy of Sciences of the Czech Republic, Institute of Physics, Praha, Czech Republic (GRID:grid.418095.1) (ISNI:0000000110153316)
27 University of Liverpool, Department of Physics, Liverpool, UK (GRID:grid.10025.36) (ISNI:0000000419368470)
28 Universität Kiel, Institut für Experimentelle und Angewandte Physik, Kiel, Germany (GRID:grid.9764.c) (ISNI:0000000121539986)
29 Universität Wuppertal, Fachbereich C, Wuppertal, Germany (GRID:grid.7787.f) (ISNI:0000000123645811); Universität Wuppertal, Rechenzentrum, Wuppertal, Germany (GRID:grid.7787.f) (ISNI:0000000123645811)
30 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); CERN, Geneva, Switzerland (GRID:grid.9132.9) (ISNI:0000000095478293)
31 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000000122886103)
32 University of Montenegro, Faculty of Science, Podgorica, Serbia and Montenegro (GRID:grid.12316.37) (ISNI:0000000121820188); Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000000123750603)
33 Paul Scherrer Institut, Villigen, Switzerland (GRID:grid.5991.4) (ISNI:0000000110907501)
34 Institute for Nuclear Physics, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000000109428941)
35 University of Birmingham, School of Physics and Astronomy, Birmingham, UK (GRID:grid.6572.6) (ISNI:0000000419367486)
36 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
37 Queen Mary and Westfield College, London, UK (GRID:grid.4868.2) (ISNI:0000000121711133)
38 University of Lund, Physics Department, Lund, Sweden (GRID:grid.4514.4) (ISNI:0000000109302361)
39 University of Lancaster, Department of Physics, Lancaster, UK (GRID:grid.9835.7) (ISNI:0000000081906402)
40 CINVESTAV, Departamento de Fisica, Merida, Mexico (GRID:grid.418275.d) (ISNI:0000000121658782)
41 Universität Wuppertal, Fachbereich C, Wuppertal, Germany (GRID:grid.7787.f) (ISNI:0000000123645811)
42 Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium (GRID:grid.4989.c) (ISNI:0000000123480746); Universiteit Antwerpen, Antwerpen, Belgium (GRID:grid.5284.b) (ISNI:0000000107903681); University of P.J. Šafárik, Košice, Slovak Republic (GRID:grid.11175.33) (ISNI:0000000405760391)
43 Universität Heidelberg, Kirchhoff-Institut für Physik, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000000121904373)
44 University of Lund, Physics Department, Lund, Sweden (GRID:grid.4514.4) (ISNI:0000000109302361); DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
45 Joint Institute for Nuclear Research, Dubna, Russia (GRID:grid.33762.33) (ISNI:0000000406204119)
46 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Institute for Nuclear Physics, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000000109428941)
47 Universität Dortmund, Institut für Physik, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000000104169637); DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
48 Universiteit Antwerpen, Antwerpen, Belgium (GRID:grid.5284.b) (ISNI:0000000107903681)
49 RWTH, I. Physikalisches Institut, Aachen, Germany (GRID:grid.1957.a) (ISNI:000000010728696X)
50 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria (GRID:grid.425050.6)
51 Slovak Academy of Sciences, Institute of Experimental Physics, Košice, Slovak Republic (GRID:grid.419303.c) (ISNI:0000000121809405); University of P.J. Šafárik, Košice, Slovak Republic (GRID:grid.11175.33) (ISNI:0000000405760391)
52 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); National Technical University, Physics Department, Athens, Greece (GRID:grid.4241.3) (ISNI:0000000121859808)





