Search for resonance decays to a ν¯ plus jet in e+p scattering at DESY HERA
J. BreitwegS. ChekanovUniversity andM. DerrickD. 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. StanekArgonne National Laboratory , Argonne , Illinois 60439-4815R. YoshidaArgonne National Laboratory , Argonne , Illinois 60439-4815M.C.K. MattinglyAndrews University , Berrien Springs , Michigan 49104-0380P. AntonioliG. BariM. BasileL. BellagambaD. BoscheriniNow at DESY , Hamburg , GermanyA. BruniINFN Bologna , Bologna , ItalyG. BruniINFN Bologna , Bologna , ItalyG. Cara RomeoINFN Bologna , Bologna , ItalyL. CifarelliNow at Univ. of Salerno andF. CindoloA. ContinM. CorradiS. De PasqualeP. GiustiG. IacobucciINFN Bologna , Bologna , ItalyG. LéviINFN Bologna , Bologna , ItalyA. MargottiINFN Bologna , Bologna , ItalyT. MassamINFN Bologna , Bologna , ItalyR. NaniaINFN Bologna , Bologna , ItalyF. PalmonariA. PesciG. SartorelliINFN Bologna , Bologna , ItalyA. ZichichiINFN Bologna , Bologna , ItalyChristoph AmelungNow at CERN , Geneva , SwitzerlandA. BornheimNow at CalTech , Pasadena , California 91125 I. BrockK. CobökenJ. CrittendenPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyR. DeffnerNow at Siemens ICN , Berlin , GermanyH. HartmannINFN Bologna , Bologna , ItalyK. HeinlothRetired. h Now at Dongshin University , Naju , KoreaE. HilgerINFN Bologna , Bologna , ItalyP. IrrgangH.‐P. JakobA. KappesU. KatzR. KergerE. PaulPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyJ. RautenbergPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyH. SchnurbuschINFN Bologna , Bologna , ItalyA. StifutkinINFN Bologna , Bologna , ItalyJ. TandlerINFN Bologna , Bologna , ItalyK.C. VossA. WeberPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyH. WieberPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyD. BaileyUniversity andO. BarretN. H. BrookB. FosterNow at DESY , Hamburg , GermanyG. P. HeathPhysikalisches Institut der Universita ¨t Bonn , Bonn , GermanyH. F. HeathPhysics Laboratory , University of Bristol , Bristol , United KingdomE. RodriguesPhysics Laboratory , University of Bristol , Bristol , United KingdomJ. ScottPhysics Laboratory , University of Bristol , Bristol , United KingdomR.J. TapperPhysics Laboratory , University of Bristol , Bristol , United KingdomM. CapuaCalabria University , Physics Department and INFN , Cosenza , ItalyA. MastroberardinoCalabria University , Physics Department and INFN , Cosenza , ItalyM. SchioppaCalabria University , Physics Department and INFN , Cosenza , ItalyG. SusinnoPhysics Laboratory , University of Bristol , Bristol , United KingdomH.Y. JeoungChonnam National University , Kwangju , KoreaJ. Y. KimChonnam National University , Kwangju , KoreaJ. H. LeeChonnam National University , Kwangju , KoreaI. T. LimChonnam National University , Kwangju , KoreaK. J.M.Y. PacCalabria University , Physics Department and INFN , Cosenza , ItalyA. CaldwellNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027W. LiuNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027X. LiuNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027B. MelladoNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027E. PaganisNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027Scott E. SampsonNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027W. 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. KlimekInstitute of Nuclear Physics , Cracow , PolandK. OlkiewiczInstitute of Nuclear Physics , Cracow , PolandK. PiotrzkowskiNow at CERN , Geneva , SwitzerlandM. PrzybycieńNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027P. StopaNevis Laboratories , Columbia University , Irvington on Hudson , New York 10027L. ZawiejskiInstitute of Nuclear Physics , Cracow , PolandB. BednarekInstitute of Nuclear Physics , Cracow , PolandK. JeleńInstitute of Nuclear Physics , Cracow , PolandD. KisielewskaInstitute of Nuclear Physics , Cracow , PolandA.M. KowalInstitute of Nuclear Physics , Cracow , PolandT. Z. KowalskiInstitute of Nuclear Physics , Cracow , PolandE. Rulikowska-ZarȩbskaL. SuszyckiFaculty of Physics and Nuclear Techniques , Academy of Mining and Metallurgy , Cracow , Poland
2001lv
ABI
Аннотация
A study of the $\overline{\ensuremath{\nu}}$-jet mass spectrum in ${e}^{+}\stackrel{\ensuremath{\rightarrow}}{p}\overline{\ensuremath{\nu}}X$ events at a center-of-mass energy 300 GeV has been performed with the ZEUS detector at the HERA collider at DESY using an integrated luminosity of 47.7 ${\mathrm{pb}}^{\ensuremath{-}1}.$ The mass spectrum is in good agreement with that expected from standard model processes over the $\overline{\ensuremath{\nu}}$-jet mass range studied. No significant excess attributable to the decay of a narrow resonance is observed. By using both ${e}^{+}\stackrel{\ensuremath{\rightarrow}}{p}{e}^{+}X$ and ${e}^{+}\stackrel{\ensuremath{\rightarrow}}{p}\overline{\ensuremath{\nu}}X$ data, mass-dependent limits are set on the s-channel production of scalar and vector resonant states. Couplings to first-generation quarks are considered and limits are presented as a function of the ${e}^{+}q$ and $\overline{\ensuremath{\nu}}q$ branching ratios. These limits are used to constrain the production of leptoquarks and R-parity violating squarks.
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