Maqola

Search for lepton-flavor violation in e+p collisions at DESY HERA

S. ChekanovM. DerrickArgonne National Laboratory , Argonne , Illinois 60439-4815D. KrakauerArgonne National Laboratory , Argonne , Illinois 60439-4815S. MagillArgonne National Laboratory , Argonne , Illinois 60439-4815B. MusgraveArgonne National Laboratory , Argonne , Illinois 60439-4815A. PellegrinoArgonne National Laboratory , Argonne , Illinois 60439-4815J. RepondArgonne National Laboratory , Argonne , Illinois 60439-4815R. YoshidaM.C.K. MattinglyP. AntonioliG. BariAndrews University , Berrien Springs , Michigan 49104-0380M. BasileAndrews University , Berrien Springs , Michigan 49104-0380L. BellagambaAndrews University , Berrien Springs , Michigan 49104-0380D. BoscheriniAndrews University , Berrien Springs , Michigan 49104-0380A. BruniAndrews University , Berrien Springs , Michigan 49104-0380G. BruniAndrews University , Berrien Springs , Michigan 49104-0380G. Cara RomeoL. CifarelliAndrews University , Berrien Springs , Michigan 49104-0380F. CindoloAndrews University , Berrien Springs , Michigan 49104-0380A. ContinAndrews University , Berrien Springs , Michigan 49104-0380M. CorradiAndrews University , Berrien Springs , Michigan 49104-0380S. De PasqualeAndrews University , Berrien Springs , Michigan 49104-0380P. GiustiPhysics Laboratory , University of Bristol , Bristol , United KingdomG. IacobucciG. LéviA. MargottiINFN Bologna , Bologna , ItalyT. MassamINFN Bologna , Bologna , ItalyR. NaniaINFN Bologna , Bologna , ItalyF. PalmonariAndrews University , Berrien Springs , Michigan 49104-0380A. PesciPhysics Laboratory , University of Bristol , Bristol , United KingdomG. SartorelliA. ZichichiG. AghuzumtsyanD. BartschINFN Bologna , Bologna , ItalyI. BrockINFN Bologna , Bologna , ItalyJ. CrittendenINFN Bologna , Bologna , ItalyS. GoersPhysics Laboratory , University of Bristol , Bristol , United KingdomH. HartmannPhysics Laboratory , University of Bristol , Bristol , United KingdomE. HilgerPhysics Laboratory , University of Bristol , Bristol , United KingdomP. IrrgangH.‐P. JakobA. Kappesnow at Brookhaven National Lab. , Upton / NY , USAU. KatzP-03B 00219 Lódź University , Poland supR. KergerPhysikalisches Institut der Universität Bonn , Bonn , GermanyO. KindPhysics Laboratory , University of Bristol , Bristol , United KingdomE. PaulPhysics Laboratory , University of Bristol , Bristol , United KingdomJ. RautenbergPhysics Laboratory , University of Bristol , Bristol , United KingdomR. RennerH. SchnurbuschA. StifutkinPhysikalisches Institut der Universität Bonn , Bonn , GermanyJ. TandlerPhysikalisches Institut der Universität Bonn , Bonn , GermanyK.C. VossPhysics Laboratory , University of Bristol , Bristol , United KingdomA. WeberPhysics Laboratory , University of Bristol , Bristol , United KingdomH. WessoleckPhysics Laboratory , University of Bristol , Bristol , United KingdomD. BaileyN. H. BrookPhysikalisches Institut der Universität Bonn , Bonn , GermanyJ. E. ColePhysikalisches Institut der Universität Bonn , Bonn , GermanyB. FosterPhysics Laboratory , University of Bristol , Bristol , United KingdomG. P. HeathPhysics Laboratory , University of Bristol , Bristol , United KingdomH. F. HeathPhysics Laboratory , University of Bristol , Bristol , United KingdomS. RobinsPhysics Laboratory , University of Bristol , Bristol , United KingdomE. RodriguesJ. ScottPhysikalisches Institut der Universität Bonn , Bonn , GermanyR.J. TapperPhysikalisches Institut der Universität Bonn , Bonn , GermanyM. WingPhysics Laboratory , University of Bristol , Bristol , United KingdomM. CapuaChonnam National University , Kwangju , KoreaA. MastroberardinoUniversity of Tokyo supported by the Comunidad Autonoma deM. SchioppaCalabria University , Physics Department and INFN , Cosenza , ItalyG. SusinnoPhysics Laboratory , University of Bristol , Bristol , United KingdomH.Y. JeoungChonnam National University , Kwangju , KoreaJ. Y. Kimnow at IBM Global Services , Frankfurt/Main , Germany partly supported byJ. H. LeeChonnam National University , Kwangju , KoreaI. T. LimCalabria University , Physics Department and INFN , Cosenza , ItalyK. J.M.Y. PacPhysics Laboratory , University of Bristol , Bristol , United KingdomA. CaldwellChonnam National University , Kwangju , KoreaM. HelbichTel Aviv University present address:X. LiuChonnam National University , Kwangju , KoreaB. MelladoNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027E. PaganisTokyo Metropolitan University of Health Sciences , Tokyo 116-8551 , JapanW. B. SchmidkeNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027F. SciulliNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027J. J. ChwastowskiInstitute of Nuclear Physics , Cracow , PolandA. EskreysInstitute of Nuclear Physics , Cracow , PolandJ. FigielInstitute of Nuclear Physics , Cracow , PolandK. OlkiewiczNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027M. PrzybycieńNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027P. StopaNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027L. ZawiejskiB. BednarekInstitute of Nuclear Physics , Cracow , PolandI. Grabowska-BołdInstitute of Nuclear Physics , Cracow , PolandK. JeleńFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , PolandD. KisielewskaFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , PolandA.M. KowalFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , PolandM. KowalFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , PolandT. Z. KowalskiInstitute of Nuclear Physics , Cracow , PolandB. MindurInstitute of Nuclear Physics , Cracow , PolandE. Rulikowska-ZarȩbskaFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , PolandL. SuszyckiFaculty of Physics and Nuclear Techniques , University of Mining and Metallurgy , Cracow , Poland

2002lv

ABI

Annotatsiya

A search has been made for lepton-flavor-violating interactions of the type ${e}^{+}\stackrel{\ensuremath{\rightarrow}}{p}lX,$ where l denotes a \ensuremath{\mu} or \ensuremath{\tau} with high transverse momentum, at a center-of-mass energy $\sqrt{s}$ of 300 GeV with an integrated luminosity of 47.7 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ using the ZEUS detector at HERA. No evidence was found for lepton-flavor violation and constraints were derived on leptoquarks (LQs) that could mediate such interactions. For LQ masses below $\sqrt{s},$ limits are set on ${\ensuremath{\lambda}}_{{\mathrm{eq}}_{1}}$ $\sqrt{{\ensuremath{\beta}}_{\mathrm{lq}}},$ where ${\ensuremath{\lambda}}_{{\mathrm{eq}}_{1}}$ is the coupling of the LQ to an electron and a first-generation quark ${q}_{1}$ and ${\ensuremath{\beta}}_{\mathrm{lq}}$ is the branching ratio of the LQ to l and a quark. For LQ masses exceeding $\sqrt{s},$ limits are set on the four-fermion contact-interaction term ${\ensuremath{\lambda}}_{{\mathrm{eq}}_{\ensuremath{\alpha}}}$ ${\ensuremath{\lambda}}_{{\mathrm{lq}}_{\ensuremath{\beta}}}{/M}_{\mathrm{LQ}}^{2}$ for leptoquarks that couple to an electron and a quark ${q}_{\ensuremath{\alpha}}$ and also to l and a quark ${q}_{\ensuremath{\beta}}.$ Some of the limits are also applicable to lepton-flavor-violating processes mediated by squarks in R-parity-violating supersymmetric models. In some cases involving heavy quarks and especially for $l=\ensuremath{\tau},$ the ZEUS limits are the most stringent published to date.

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Identifikatorlar

DOI: 10.1103/physrevd.65.092004

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