Isolated tau leptons in events with large missing transverse momentum at HERA
S. ChekanovArgonne National Laboratory , Argonne , IL 60439-4815 , USAM DerrickNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)D. KrakauerArgonne National Laboratory , Argonne , IL 60439-4815 , USAJ.H. LoizidesAlso affiliated with University College London , London , UKS. MagillNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)S. MiglioranziAlso affiliated with University College London , London , UKB. MusgraveArgonne National Laboratory , Argonne , IL 60439-4815 , USAJ. RepondNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)R. YoshidaArgonne National Laboratory , Argonne , IL 60439-4815 , USAM.C.K. MattinglyAndrews University, Berrien Springs, MI 49104-0380, USAP. AntonioliUniversity andG. BariUniversity andM. BasileUniversity andL. BellagambaAndrews University , Berrien Springs , MI 49104-0380 , USAD BoscheriniAndrews University , Berrien Springs , MI 49104-0380 , USAA. BruniAndrews University , Berrien Springs , MI 49104-0380 , USAG. BruniNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)G. Cara RomeoUniversity andL CifarelliUniversity andF. CindoloUniversity andA. ContinAndrews University , Berrien Springs , MI 49104-0380 , USAM CorradiAndrews University , Berrien Springs , MI 49104-0380 , USAS. De PasqualeINFN Bologna , Bologna , ItalyP GiustiUniversity andG. IacobucciUniversity andA. MargottiA. MontanariINFN Bologna , Bologna , ItalyR. NaniaINFN Bologna , Bologna , ItalyF. PalmonariINFN Bologna , Bologna , ItalyA. PesciINFN Bologna , Bologna , ItalyG SartorelliUniversity andA. ZichichiINFN Bologna , Bologna , ItalyG. AghuzumtsyanUniversity andD BartschUniversity andI. BrockUniversity andS. GoersNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)H HartmannNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)E HilgerINFN Bologna , Bologna , ItalyP IrrgangINFN Bologna , Bologna , ItalyH.‐P. JakobO. KindUniversity andU. MeyerUniversity andE PaulUniversity andJ RautenbergINFN Bologna , Bologna , ItalyR. RennerINFN Bologna , Bologna , ItalyA. StifutkinINFN Bologna , Bologna , ItalyJ. TandlerUniversity andK.C VossPhysikalisches Institut der Universität Bonn , Bonn , GermanyMeng WangNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)A. WeberPhysikalisches Institut der Universität Bonn , Bonn , GermanyD. BaileyPPARC Advanced Fellow N. H. BrookJ. E. ColePhysikalisches Institut der Universität Bonn , Bonn , GermanyG.P HeathPhysikalisches Institut der Universität Bonn , Bonn , GermanyT. NamsooNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)S. RobinsNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)M. WingPhysics Laboratory , University of Bristol , Bristol , United KingdomM. CapuaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)A. MastroberardinoCalabria University , Physics Department and INFN , Cosenza , ItalyM SchioppaPhysics Laboratory , University of Bristol , Bristol , United KingdomG. SusinnoPhysics Laboratory , University of Bristol , Bristol , United KingdomJ.Y KimChonnam National University , Kwangju , South KoreaY.K KimChonnam National University , Kwangju , South KoreaJ.H LeeChonnam National University , Kwangju , South KoreaI.T LimCalabria University , Physics Department and INFN , Cosenza , ItalyM.Y PacCalabria University , Physics Department and INFN , Cosenza , ItalyA CaldwellNow at Max-Planck-Institut für Physik , München , GermanyM. HelbichNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAX LiuNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)B. MelladoNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAY NingAndrews University, Berrien Springs, MI 49104-0380, USAE. PaganisNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAZ. RenNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAW.B SchmidkeNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAF SciulliNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAJ. J. ChwastowskiNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)A. EskreysInstitute of Nuclear Physics , Cracow , PolandJ. FigielNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)A. GalasInstitute of Nuclear Physics , Cracow , PolandK. OlkiewiczNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)P. StopaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)L. ZawiejskiNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAL. AdamczykInstitute of Nuclear Physics , Cracow , PolandT BołdNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)I. Grabowska-BołdInstitute of Nuclear Physics , Cracow , PolandD. KisielewskaInstitute of Nuclear Physics , Cracow , PolandA.M KowalInstitute of Nuclear Physics , Cracow , PolandM KowalNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAT KowalskiAGH University of KrakowM. PrzybycieńFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandL. SuszyckiFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandD SzubaFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandJ SzubaAGH University of KrakowA KotańskiFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandW. SłomińskiNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)V. AdlerNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)U. BehrensDepartment of Physics , Jagellonian University , Cracow , PolandI BlochNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)K. BorrasNIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by The Netherlands Foundation for Research on Matter (FOM)V. ChiochiaDepartment of Physics , Jagellonian University , Cracow , Poland
2004en
ABI
Аннотация
A search for events containing isolated tau leptons and large missing transverse momentum, not originating from the tau decay, has been performed with the ZEUS detector at the electron–proton collider HERA, using 130 pb−1 of integrated luminosity. A search was made for isolated tracks coming from hadronic tau decays. Observables based on the internal jet structure were exploited to discriminate between tau decays and quark- or gluon-induced jets. Three tau candidates were found, while 0.40+0.12−0.13 were expected from Standard Model processes, such as charged current deep inelastic scattering and single W±-boson production. To search for heavy-particle decays, a more restrictive selection was applied to isolate tau leptons produced together with a hadronic final state with high transverse momentum. Two candidate events survive, while 0.20±0.05 events are expected from Standard Model processes.
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