Search for R-parity violation with a $\bar{U} \bar{D} \bar{D}$ coupling at $\sqrt{s}$ = 189 GeV

P. Abreu W. Adam T. Adye P. Adzic I. Azhinenko Z. Albrecht T. Alderweireld G.D. Alekseev R. Alemany T. Allmendinger P.P. Allport S. Almehed U. Amaldi N. Amapane S. Amato E.G. Anassontzis P. Andersson A. Andreazza S. Andringa P. Antilogus 1 W.D. Apel Y. Arnoud 2 B. Asman J.-E. Augustin 3 A. Augustinus P. Baillon P. Bambade 4 F. Barao Guido Barbiellini R. Barbier 1 D.Yu. Bardin G. Barker A. Baroncelli M. Battaglia M. Baubillier 3 K.H. Becks M. Begalli A. Behrmann P. Beilliere Yu. Belokopytov N.C. Benekos A.C. Benvenuti C. Berat 2 M. Berggren 3 D. Bertrand M. Besancon M. Bigi M.S. Bilenkii M.A. Bizouard D. Bloch 5 H.M. Blom M. Bonesini M. Boonekamp P.S.L. Booth A.W. Borgland G. Borisov C. Bosio O. Botner E. Boudinov B. Bouquet 4 C. Bourdarios 4 T.J.V. Bowcock I. Boyko I. Bozovic M. Bozzo M. Bracko P. Branchini R.A. Brenner P. Bruckman J.M. Brunet 6 L. Bugge T. Buran B. Buschbeck P. Buschmann S. Cabrera M. Caccia M. Calvi T. Camporesi V. Canale F. Carena L. Carroll C. Caso M.V. Castillo Gimenez A. Cattai F.R. Cavallo V. Chabaud P. Charpentier P. Checchia G.A. Chelkov R. Chierici P. Shlyapnikov P. Chochula V. Chorowicz J. Chudoba K. Cieslik P. Collins R. Contri E. Cortina G. Cosme F. Cossutti H.B. Crawley D. Crennell G. Crosetti J. Cuevas Maestro S. Czellar M. Davenport W. Da Silva G. Della Ricca P. Delpierre 7 N. Demaria A. de Angelis W. de Boer C. de Clercq B. de Lotto A. de Min L. de Paula H. Dijkstra L. Di Ciaccio J. Dolbeau 6 K. Doroba M. Dracos 5 J. Drees M. Dris A. Duperrin J.D. Durand G. Eigen T. Ekelof G. Ekspong M. Ellert M. Elsing J.P. Engel 5 M. Espirito Santo G. Fanourakis D. Fassouliotis J. Fayot 3 M. Feindt A. Fenyuk A. Ferrer E. Ferrer-Ribas 4 F. Ferro S. Fichet 3 A. Firestone U. Flagmeyer H. Foeth E. Fokitis F. Fontanelli B. Franek A.G. Frodesen R. Fruhwirth F. Fulda-Quenzer 4 J. Fuster A. Galloni D. Gamba S. Gamblin M. Gandelman C. Garcia C. Gaspar M. Gaspar U. Gasparini P. Gavillet E.N. Gazis D. Gele 5 N. Ghodbane 1 I. Gil F. Glege R. Gokieli B. Golob G. Gomez-Ceballos P. Goncalves I. Gonzalez Caballero G. Gopal L. Gorn Yu. Gouz V. Gracco J. Grahl E. Graziani P. Gris G. Grosdidier 4 K. Grzelak J. Guy C. Haag F. Hahn S. Hahn S. Haider A. Hallgren K. Hamacher J. Hansen F.J. Harris V. Hedberg S. Heising J.J. Hernandez P. Herquet H. Herr T.L. Hessing J.M. Heuser E. Higon S.O. Holmgren P.J. Holt S. Hoorelbeke M. Houlden J. Hrubec M. Huber K. Huet G.J. Hughes K. Hultqvist J.N. Jackson R. Jacobsson P. Jalocha R. Janik C. Jarlskog G. Jarlskog P. Jarry B. Jean-Marie 4 D. Jeans E.K. Johansson P. Jonsson 1 C. Joram P. Juillot 5 L. Jungermann F. Kapusta 3 K. Karafasoulis S. Katsanevas 1 E.C. Katsoufis R. Keranen G. Kernel B.P. Kersevan B.A. Khomenko N.N. Khovansky A. Kiiskinen B. King A. Kinvig N.J. Kjaer O. Klapp H. Klein P. Kluit P. Kokkinias V. Kostyukhin C. Kourkoumelis O. Kuznetsov M. Krammer E. Kriznic Z. Krumshtein P. Kubinec J. Kurowska K. Kurvinen J.W. Lamsa D.W. Lane V. Lapin J.P. Laugier R. Lauhakangas G. Leder F. Ledroit 2 V. Lefebure L. Leinonen A. Leisos R. Leitner J. Lemonne G. Lenzen V. Lepeltier 4 T. Lesiak M. Lethuillier 1 J. Libby W. Liebig D. Liko A. Lipniacka I. Lippi B. Lorstad J.G. Loken J.H. Lopes J.M. Lopez R. Lopez-Fernandez 2 D. Loukas P. Lutz L. Lyons J. Macnaughton J.R. Mahon A. Maio A. Malek T.G.M. Malmgren S. Maltezos V. Malychev F. Mandl J. Marco R. Marco B. Marechal M. Margoni J.C. Marin C. Mariotti A. Markou C. Martinez-Rivero F. Martinez-Vidal I Garcia S. Marti J. Masik N. Mastroyiannopoulos F. Matorras C. Matteuzzi G. Matthiae F. Mazzucato M. Mazzucato M. Mccubbin R. Mckay R. Mcnulty G. Mcpherson E. Merle 2 C. Meroni W.T. Meyer A. Myagkov E. Migliore L. Mirabito 1 W.A. Mitaroff U. Mjornmark T. Moa M. Moch R. Moller K. Monig M.R. Monge D. Moraes X. Moreau 3 P. Morettini G. Morton U. Muller K. Munich M. Mulders C. Mulet-Marquis 2 R. Muresan W.J. Murray B. Muryn G. Myatt T. Myklebust F. Naraghi 2 M. Nassiakou F.L. Navarria S. Navas K. Nawrocki P. Negri N. Neufeld R. Nicolaidou B.S. Nielsen P. Niezurawski M. Nikolenko V. Nomokonov A. Nygren V. Obraztsov A.G. Olshevsky A. Onofre R. Orava G. Orazi 5 K. Osterberg A. Ouraou M. Paganoni S. Paiano R. Pain 3 R. Paiva J. Palacios H. Palka T.D. Papadopoulou K. Papageorgiou L. Pape C. Parkes F. Parodi U. Parzefall A. Passeri O. Passon T. Pavel M. Pegoraro L. Peralta M. Pernicka A. Perrotta C. Petridou A. Petrolini H.T. Phillips F. Pierre M. Pimenta E. Piotto T. Podobnik M.E. Pol G. Polok P. Poropat V. Pozdnyakov P. Privitera N. Pukhaeva A. Pullia D. Radojicic S. Ragazzi H. Rahmani J. Rames P.N. Ratoff A.L. Read P. Rebecchi N.G. Redaelli M. Regler J. Rehn D. Reid R. Reinhardt P.B. Renton L.K. Resvanis F. Richard 4 J. Ridky G. Rinaudo I. Ripp-Baudot 5 O. Rohne A. Romero P. Ronchese E.I. Rosenberg P. Rosinsky P. Roudeau 4 T. Rovelli C. Royon V. Ruhlmann-Kleider A. Ruiz H. Saarikko Y. Sacquin A. Sadovsky G. Sajot 2 J. Salt D. Sampsonidis M. Sannino P. Schwemling 3 B. Schwering U. Schwickerath F. Scuri P. Seager Yu. Sedykh A.M. Segar N. Seibert R. Sekulin R.C. Shellard M. Siebel L. Simard F. Simonetto A.N. Sisakian G. Smadja 1 N. Smirnov O. Smirnova G.R. Smith A. Sopczak R. Sosnowski T. Spassoff E. Spiriti S. Squarcia C. Stanescu S. Stanic M. Stanitzki K. Stevenson A. Stocchi 4 J. Strauss R. Strub 5 B. Stugu M. Szczekowski M. Szeptycka T. Tabarelli A. Taffard O. Chikilev F. Tegenfeldt F. Terranova J. Thomas J. Timmermans N. Tinti L.G. Tkachev M. Tobin S. Todorova A. Tomaradze B. Tome A. Tonazzo L. Tortora Pablo Tortosa G. Transtromer D. Treille G. Tristram 6 M. Trochimczuk C. Troncon M.L. Turluer I.A. Tyapkin S. Tzamarias O. Ullaland V. Uvarov G. Valenti E. Vallazza C. Vander Velde P. Van Dam W. Van den Boeck W.K. Van Doninck J. Van Eldik A. Van Lysebetten N. Van Remortel I. Van Vulpen G. Vegni L. Ventura W. Venus F. Verbeure P. Verdier 1 M. Verlato L.S. Vertogradov V. Verzi D. Vilanova L. Vitale E. Vlasov A.S. Vodopyanov G. Voulgaris V. Vrba H. Wahlen C. Walck A.J. Washbrook C. Weiser D. Wicke J.H. Wickens G.R. Wilkinson M. Winter 5 M. Witek G. Wolf J. Yi O. Yushchenko A. Zalewska P. Zalewski D. Zavrtanik E. Zevgolatakos N.I. Zimin A. Zinchenko P. Zoller 5 G.C. Zucchelli G. Zumerle
1 IPNL - Institut de Physique Nucléaire de Lyon
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 IReS - Institut de Recherches Subatomiques
6 PCC - Physique Corpusculaire et Cosmologie - Collège de France
7 CPPM - Centre de Physique des Particules de Marseille
Abstract : Searches for pair production of gauginos and squarks in $e^{+} e^{-}$ collisions at a centre-of-mass energy of 189 GeV have been performed on data corresponding to an integrated luminosity of 158 pb$^{-1}$ collected by the DELPHI detector at LEP. The data were analyzed under the assumption of non-conservation of \mbox{$R$-parity} through a single dominant $\bar{U} \bar{D} \bar{D}$~coupling between squarks and quarks. Typical final states contain between 4 and 10 jets with or without additional leptons. No excess of data above Standard Model expectations was observed. The results were used to constrain domains of the MSSM parameter space and derive limits on the masses of supersymmetric particles. The following mass limits at 95\% CL were obtained from these searches: \begin{itemize} \item neutralino mass: $m_{\tilde{\chi^0_{1}}} \ge 32$ GeV \item chargino mass: $m_{\tilde{\chi^+_{1}}} \ge 94 $ GeV \item stop and sbottom mass (indirect decay) with $\Delta M 5$ GeV: $m_{\tilde{t_{1}}} \ge 74$ GeV, for $\Phi_{mix}=0$ rad $m_{\tilde{t_{1}}} \ge 59$ GeV, for $\Phi_{mix}=0.98 $ rad $m_{\tilde{b_{1}}} \ge 72$ GeV, for $\Phi_{mix}=0$ rad. \end{itemize} The angle $\phi_{mix}$ is the mixing angle between left and right handed quarks.
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P. Abreu, W. Adam, T. Adye, P. Adzic, I. Azhinenko, et al.. Search for R-parity violation with a $\bar{U} \bar{D} \bar{D}$ coupling at $\sqrt{s}$ = 189 GeV. Physics Letters B, Elsevier, 2001, 500, pp.22-36. ⟨in2p3-00008013⟩

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