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Search for excited electrons in ep collisions at HERA

F.D. Aaron C. Alexa V. Andreev B. Antunovic S. Aplin A. Asmone A. Astvatsatourov A. Bacchetta S. Backovic A. Baghdasaryan P. Baranov E. Barrelet W. Bartel M. Beckingham K. Begzsuren O. Behnke A. Belousov N. Berger J.C. Bizot 1 M.-O. Boenig V. Boudry I. Bozovic-Jelisavcic J. Bracinik G. Brandt M. Brinkmann V. Brisson 1 D. Bruncko A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell K.B. Cantun Avila F. Cassol-Brunner 2 K. Cerny V. Cerny V. Chekelian A. Cholewa J.G. Contreras J.A. Coughlan G. Cozzika 3 J. Cvach J.B. Dainton K. Daum M. Deák Y. de Boer B. Delcourt 1 M. del Degan J. Delvax A. de Roeck E.A. de Wolf C. Diaconu 2 V. Dodonov A. Dubak G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele A. Eliseev E. Elsen S. Essenov A. Falkiewicz P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Feltesse 3 J. Ferencei L. Finke M. Fleischer A. Fomenko G. Franke T. Frisson E. Gabathuler J. Gayler S. Ghazaryan S. Ginzburgskaya A. Glazov I. Glushkov 4 L. Goerlich M. Goettlich N. Gogitidze S. Gorbounov M. Gouzevitch C. Grab T. Greenshaw B.R. Grell G. Grindhammer S. Habib D. Haidt M. Hansson G. Heinzelmann C. Helebrant R.C.W. Henderson H. Henschel 4 G. Herrera M. Hildebrandt K.H. Hiller 4 D. Hoffmann 2 R. Horisberger A. Hovhannisyan T. Hreus M. Jacquet 1 M.E. Janssen X. Janssen V. Jemanov L. Jönsson D.P. Johnson A.W. Jung H. Jung M. Kapichine J. Katzy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge A. Knutsson V. Korbel P. Kostka 4 M. Kraemer K. Krastev J. Kretzschmar A. Kropivnitskaya K. Krüger M.P.J. Landon W. Lange 4 G. Latovika-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian G. Li 1 L. Lindfeld K. Lipka A. Liptaj B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov A.-I. Lucaci-Timoce L. Lytkin A. Makankine E. Malinovski P. Marage Ll. Marti M. Martisikova H.-U. Martyn S.J. Maxfield A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer V. Michels S. Mikocki I. Milcewicz-Mika A. Mohamed F. Moreau A. Morozov J.V. Morris M.U. Mozer K. Müller P. Murín K. Nankov B. Naroska Th. Naumann 4 P.R. Newman C. Niebuhr A. Nikiforov G. Nowak K. Nowak M. Nozicka R. Oganezov B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias M. Pandurovic Th. Papadopoulou C. Pascaud 1 G.D. Patel H. Peng E. Perez 3 D. Perez-Astudillo A. Perieanu A. Petrukhin I. Picuric S. Piec 4 D. Pitzl R. Plaakyt R. Polifka B. Povh T. Preda P. Prideaux V. Radescu A.J. Rahmat N. Raicevic T. Ravdandorj P. Reimer C. Risler E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev Z. Rurikova S. Rusakov F. Salvaire D.P.C. Sankey M. Sauter E. Sauvan 2 S. Schmidt S. Schmitt C. Schmitz L. Schoeffel 3 A. Schöning H.-C. Schultz-Coulon F. Sefkow R.N. Shaw-West I. Sheviakov L.N. Shtarkov T. Sloan I. Smiljanic P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka Z. Staykova M. Steder B. Stella J. Stiewe U. Straumann D. Sunar T. Sykora V. Tchoulakov G. Thompson P.D. Thompson T. Toll F. Tomasz T.H. Tran 1 D. Traynor T.N. Trinh 2 P. Truöl I. Tsakov B. Tseepeldorj G. Tsipolitis I. Tsurin 4 J. Turnau E. Tzamariudaki K. Urban D. Utkin A. Valkárová Corentin Vallée 2 P. van Mechelen A. Vargas Trevino Y. Vazdik S. Vinokurova V. Volchinski G. Weber R. Weber D. Wegener C. Werner M. Wessels Ch. Wissing R. Wolf E. Wünsch S. Xella W. Yan V. Yeganov J. Zácek J. Záleák Zhiqing Zhang 1 A. Zhelezov A. Zhokin Y.C. Zhu T. Zimmermann H. Zohrabyan F. Zomer 1
Abstract : A search for excited electrons is performed using the full e±p data sample collected by the H1 experiment at HERA, corresponding to a total luminosity of 475 pb−1. The electroweak decays of excited electrons e*→eγ, e*→eZ and e*→νW with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited electron production is found. Mass dependent exclusion limits on e* production cross sections and on the ratio f/Λ of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited electron searches. The e* production via contact interactions is also addressed for the first time in ep collisions.
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Submitted on : Tuesday, July 29, 2008 - 11:49:38 AM
Last modification on : Wednesday, October 14, 2020 - 3:47:03 AM

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F.D. Aaron, C. Alexa, V. Andreev, B. Antunovic, S. Aplin, et al.. Search for excited electrons in ep collisions at HERA. Physics Letters B, Elsevier, 2008, 666, pp.131-139. ⟨10.1016/j.physletb.2008.07.014⟩. ⟨in2p3-00307569⟩

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