A search for excited neutrinos in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>p</mml:mi></mml:math> collisions at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaV. AndreevLebedev Physical Institute, Moscow, Russia 19B. AntunovićS. AplinA. AsmoneDipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, ItalyA. AstvatsatourovInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 14S. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 19A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaP. BaranovLebedev Physical Institute, Moscow, Russia 19E. BarreletLaboratoire de Physique Nucléaire et de Hautes ÉnergiesW. BartelS. BaudrandUniversité Paris-Sud, Orsay, FranceM. BeckinghamK. BegzsurenInstitute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, MongoliaO. BehnkePhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 12A. BelousovLebedev Physical Institute, Moscow, Russia 19N. BergerSwiss National Science Foundation, Bern, SwitzerlandJ.C. BizotLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceM.-O. BoenigInstitut für Physik, TU Dortmund, Dortmund, Germany 12V. BoudryÉcole Polytechnique, Palaiseau, FranceI. Božović-Jelisavc̆ićVinca Institute of Nuclear Sciences, Belgrade, SerbiaJ. BraciníkMax Planck Society, Munich, GermanyG. BrandtPhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 12Martin BrinkmannV. BrissonUniversité Paris-Sud, Orsay, FranceD. BrunckoSlovak Academy of Sciences, Bratislava, SlovakiaA. BunyatyanYerevan Physics Institute, Yerevan, ArmeniaG. BuschhornMax Planck Society, Munich, GermanyL. BystritskayaInstitute for Theoretical and Experimental Physics, Moscow, RussiaAlan CampbellK. B. Cantun AvilaDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 18F. Cassol-BrunnerInstitut de Neurobiologie de la MéditerranéeK. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 20V. ČernýSlovak Academy of Sciences, Bratislava, SlovakiaV. ChekelianMax Planck Institute for PhysicsA. CholewaJ.G. ContrerasDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 18J. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 13G. CozzikaCEA, DSM/DAPNIA, CE-Saclay, Gif-sur-Yvette, FranceJ. CvachCzech Academy of Sciences, Prague, CzechiaJ.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 13K. DaumFachbereich C, Universität Wuppertal, Wuppertal, GermanyMichal DeákY. de BoerYerevan Physics Institute, Yerevan, ArmeniaB. DelcourtUniversité Paris-Sud, Orsay, FranceM. Del DeganInstitut für Teilchenphysik, ETH, Zürich, Switzerland 21J. DelvaxInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 14A. De RoeckDESY, Hamburg, GermanyE. A. De WolfUniversity of Antwerp, Antwerp, BelgiumC. DiaconuCPPM, CNRS/IN2P3—Université Mediterranee, Marseille, FranceV. DodonovMax Planck Institute for Nuclear PhysicsA. DossanovMax-Planck-Institut für Physik, München, GermanyA. DubakFaculty of Science, University of Montenegro, Podgorica, Montenegro 19G. EckerlinV. EfremenkoInstitute for Theoretical and Experimental Physics, Moscow, RussiaS. EgliPaul Scherrer Institut, Villigen, SwitzerlandF. EiselePhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 12A. EliseevLebedev Physical Institute, Moscow, Russia 19E. ElsenS. EssenovInstitute for Theoretical and Experimental Physics, Moscow, RussiaA. FalkiewiczInstitute for Nuclear Physics, Cracow, Poland 15Peter FaulknerUniversity of BirminghamL. FavartUniversity of Antwerp, Antwerp, BelgiumA. FedotovInstitute for Theoretical and Experimental Physics, Moscow, RussiaR. FelstJ. FeltesseDSM (Netherlands), Heerlen, NetherlandsJ. FerenceiSlovak Academy of Sciences, Bratislava, SlovakiaL. FinkeM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 19G. FrankeT. FrissonÉcole Polytechnique, Palaiseau, FranceE. GabathulerDepartment of Physics, University of Liverpool, Liverpool, UK 13J. GaylerLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceS. GhazaryanYerevan Physics Institute, Yerevan, ArmeniaA. GlazovI. GlushkovDESY, Zeuthen, GermanyL. GoerlichInstitute for Nuclear Physics, Cracow, Poland 15M. GoettlichInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 12N. GogitidzeLebedev Physical Institute, Moscow, Russia 19M. GouzevitchÉcole Polytechnique, Palaiseau, FranceC. GrabSwiss National Science Foundation, Bern, SwitzerlandT. GreenshawDepartment of Physics, University of Liverpool, Liverpool, UK 13B.R. GrellG. GrindhammerMax Planck Society, Munich, GermanyS. HabibInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 12D. HaidtInstitut National de Physique Nucléaire et de Physique des ParticulesM. HanssonPhysics Department, University of Lund, Lund, Sweden 17C. HelebrantInstitut National de Physique Nucléaire et de Physique des ParticulesR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 13H. HenschelDESY, Zeuthen, GermanyG. HerreraDepartamento de Fisica, CINVESTAV, Mexico 18M. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannInstitut de Neurobiologie de la MéditerranéeR. HorisbergerPaul Scherrer Institut, Villigen, SwitzerlandA. HovhannisyanYerevan Physics Institute, Yerevan, ArmeniaT. HreusInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 14M. JacquetLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
2008lv
ABI
Аннотация
A search for first generation excited neutrinos is performed using the full e − p data sample collected by the H1 experiment at HERA at a centre-of-mass energy of 319 GeV , corresponding to a total luminosity of 184 pb −1 . The electroweak decays of excited neutrinos ν ∗ → ν γ , ν ∗ → ν Z and ν ∗ → e W with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited neutrino production is found. Mass dependent exclusion limits on ν ∗ production cross sections and on the ratio of the coupling to the compositeness scale f / Λ are derived within gauge mediated models. A limit on f / Λ , independent of the relative couplings to the SU ( 2 ) and U ( 1 ) gauge bosons, is also determined. These limits extend the excluded region to higher masses than has been possible in previous excited neutrino searches.
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