A search for leptoquarks, leptogluons and excited leptons in H1 at HERA

Abt, I.; Ahmed, T.; Andreev, V.; Andrieu, Bernard; Appuhn, R. D.; Arpagaus, M.; Babaev, A.; Bärwolff, H.; Bán, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Bassler, U.; Beck, H. P.; Behrend, H. J.; Belousov, A.; Berger, Ch.; Bergstein, H.; Bernardi, G.; Bernet, R.; Bertrand-Coremans, G.; Besançon, M.; Biddulph, P.; Binder, E.; Bischoff, A.; Bizot, J.C.; Blobel, V.; Borras, K.; Bosetti, P.; Boudry, V.; Bourdarios, C.; Brasse, F.W.; Braun, U.; Braunschweig, W.; Brisson, V.; Bruncko, D.; Büngener, L.; Bürger, J.; Büsser, F.W.; Buniatian, A.; Bürke, S.; Buschborn, G.; Campbell, A. J.; Carli, T.; Charles, F.; Clarke, D.; Clegg, A.B.; Colombo, M.; Coughlan, J. A.; Courau, A.; Coutures, C.; Cozzika, G.; Criegee, L.; Cvach, J.; Dagoret, S.; Dainton, J. B.; Danilov, M.; Dann, A. W. E.; Dau, W.D.; David, M.; Deffur, E.; Delcourt, B.; Buono, L. Del; Devel, M.; Roeck, A. De; Dingus, P.; Dollfus, C.; Dowell, J. D.; Dreis, H. B.; Drescher, A.; Duboc, J.; Düllmann, D.; Dünger, O.; Duhm, H.H.; Ebbinghaus, R.; Eberle, M.; Ebert, J.; Ebert, T. R.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichenberger, S.; Eichler, R.; Eisele, F.; Eisenhandler, E.; Ellis, N.; Ellison, R. J.; Elsen, E.; Erdmann, M.; Evrard, E.; Favart, L.; Fedotov, A.; Feeken, D.; Felst, R.; Feltesse, J.; Fensome, I. F.; Ferencei, J.; Ferrarotto, F.; Flamm, K.; Flauger, W.; Fleischer, M.; Flügge, G.; Fomenko, A.; Fominykh, B.; Forbush, M.; Formánek, J.; Foster, J. M.; Franke, G.; Fretwurst, E.; Fuhrmann, Patrick; Gabathuler, E.; Gamerdinger, K.; Garvey, J.; Gayler, J.; Gellrich, A.; Gennis, M.; Genzel, H.; Gerhards, R.; Gillespie, D.; Godfrey, L.; Goerlach, U.; Goerlich, L.; Goldberg, M.; Goodall, A. M.; Gorelov, I.; Goritchev, P.; Grab, C.; Grässler, H.; Grässler, R.; Greenshaw, T.; Greif, Helmut; Grindhammer, G.; Grüber, C.; Haack, J.; Haidt, D.; Hajduk, L.; Hamon, O.; Handschuh, D.; Hanlon, E. M.; Hapke, M.; Harjes, J.; Haydar, R.; Haynes, W.J.; Heatherington, J.; Hedberg, V.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Herma, R.; Herynek, I.; Hildesheim, W.; Hill, P.; Hilton, C.D.; Hladký, J.; Hoeger, K. C.; Huet, Ph.; Hufnagel, H.; Huot, N.; Ibbotson, M.; Itterbeck, H.; Jabiol, M. A.; Jachołkowska, A.; Jacobsson, C.; Jaffré, M.; Jansen, Thomas L. C.; Jönsson, L.; Johannsen, K.; Johnson, Denis; Johnson, L.; Jung, H.; Kalmus, P. I. P.; Kasarian, S.; Kaschowitz, R.; Kasselmann, P.; Kathage, U.; Kaufmann, H. H.; Kenyon, I. R.; Kermiche, S.; Keuker, C.; Kiesling, C.; Klein, M.; Kleinwort, C.; Knies, G.; Ko, W.; Köhler, Thomas; Kolanoski, H.; Kole, F.; Kolya, S. D.; Korbel, V.; Korn, M.; Kostka, P.; Kotelnikov, S.K.; Krasny, M. W.; Krehbiel, H.; Krücker, D.; Krüger, U.; Kubenka, J. P.; Küster, H.; Kuhlen, M.; Kurča, T.; Kurzhöfer, J.; Кузник, Б. И.; Lander, R.; Landon, M. P. J.; Lange, W.; Langkau, Rudolf; Lanius, P.; Laporte, J. F.; Лебедев, А.Н.; Leuschner, A.; Leverenz, C.; Levonian, S.; Lewin, D.; Ley, Ch.; Lindner, A.; Lindström, G.; Lipiński, J.; Loch, P.; Lohmander, H.; Lopez, G. C.; Lüers, D.; Magnussen, N.; Malinovski, E.; Mani, S.; Marage, P.; Marks, J.; Marshall, R.; Martens, J.; Martin, R.; Martyn, H. U.; Martyniak, J.; Masson, S.; Mavroidis, A.; Maxfield, S. J.; McMahon, S. J.; Mehta, A.; Meier, K.; Mercer, D.; Merz, T.; Meyer, Chris; Meyer, H.; Meyer, J.; Mikocki, S.; Milone, V.; Monnier, E.; Moreau, F.; Moreels, J.; Morris, J. V.; Müller, K.; Мурін, П.; Murray, S. A.; Nagovizin, V.; Naroska, B.; Naumann, T.; Newton, D.; Neyret, D.; Nguyen, H. K.; Niebergall, F.; Nisius, R.; Nowak, G.; Noyes, G. W.; Nyberg, M.; Oberlack, H.; Obrock, U.; Olsson, J. E.; Orenstein, S.; Ould-Saada, F.; Pascaud, C.; Patel, G. D.; Peppel, E.; Peters, Sarah; Pharabod, J. P.; Phillips, H. T.; Phillips, J. P.; Pichler, Ch.; Pilgram, W.; Pitzl, D.; Prosi, R.; Rädel, G.; Raupach, F.; Rauschnabel, K.; Reimer, P.; Ribarics, P.; Riech, V.; Riedlberger, J.; Rietz, M.; Robertson, S.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Royon, C.; Rudowicz, M.; Rüffer, M.; Rusakov, S. V.; Rybicki, K.; Sahlmann, N.; Sánchez, E.; Sankey, D. P. C.; Savitsky, M.; Schacht, P.; Schleper, P.; Schlippe, W. von; Schmidt, C.; Schmidt, Daniel; Schmitz, W.; Schröder, V.; Schulz, M.; Schwind, A.; Scobel, W.; Seehausen, U.; Sell, Raivo; Seman, M.; Semenov, A.; Shekelyan, V.; Sheviakov, I.; Shooshtari, H.; Siegmon, G.; Siewert, U.; Sirois, Y.; Skillicorn, I. O.; Smirnov, P.; Smith, J.; Smolík, L.; Soloviev, Y.; Spitzer, H.; Staroba, P.; Steenbock, M.; Steffen, P.; Steinberg, R.; Stella, B.; Stephens, K.; Stier, J.; Stößlein, U.; Strachota, J.; Straumann, U.; Struczinski, W.; Sutton, J. P.; Taylor, Richard E.; Thiebaux, Ch; Thompson, G.; Tichomirov, I.; Trenkel, C.; Truöl, P.; Tchernyshov, V.; Turnau, J.; Tutas, J.; Urbán, L.; Usik, A.; Valkár, Š.; Valkárová, A.; Vallée, C.; Esch, Patrick van; Vartapetian, A.; Vazdik, Y.; Vecko, M.; Verrecchia, P.; Vick, R.; Villet, G.; Vogel, E.; Wacker, K.; Walker, I. W.; Walther, A.; Weber, G.; Wegener, D.; Wegner, A.; Wellisch, H. P.; Willard, S.; Winde, M.; Winter, G. G.; Wolff, Th.; Womersley, L.A.; Wright, A.E.; Wulff, N.; Yiou, T. P.; Žáček, J.; Závada, P.; Zeitnitz, C.; Ziaeepour, H.; Zimmer, M.; Zimmermann, W.; Zomer, F.

doi:10.1016/0550-3213(93)90255-n

Cited by 111 publications

(104 citation statements)

References 34 publications

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“…where f i is the distribution of the flavour i in the free proton as given by the chosen set of parton distributions. The modern sets include the rapid increase of the gluon and sea quark distributions at small values of x, in accordance with the rise discovered in the structure function F ep 2 at HERA [28]. In the DGLAP evolution we treat the massive quarks as massless and generate them only radiatively above fixed threshold scales.…”

Section: The Framework and The Assumptionsmentioning

confidence: 70%

The scale dependent nuclear effects in parton distributions for practical applications

1999

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The scale dependence of the ratios of parton distributions in a proton of a nucleus A and in the free proton,, is studied within the framework of the lowest order leading-twist DGLAP evolution. By evolving the initial nuclear distributions obtained with the GRV-LO and CTEQ4L sets at a scale Q 2 0 , we show that the ratios R A i (x, Q 2 ) are only moderately sensitive to the choice of a specific modern set of free parton distributions. We propose that to a good first approximation, this parton distribution setdependence of the nuclear ratios R A i (x, Q 2 ) can be neglected in practical applications. With this result, we offer a numerical parametrization of R A i (x, Q 2 ) for all parton flavours i in any A > 2, and at any 10 −6 ≤ x ≤ 1 and any Q 2 ≥ 2.25 GeV 2 for computing cross sections of hard processes in nuclear collisions.

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Section: The Framework and The Assumptionsmentioning

confidence: 70%

The scale dependent nuclear effects in parton distributions for practical applications

1999

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“…The highest presently available ep energy at HERA, √ s ep = 314 GeV, is rather small as compared to the envisaged UHE neutrino nucleon collision energies of up to about √ s νN = 10 6 GeV. Estimates of the corresponding total (−)ν N cross sections thus afford either extensive, possibly unreliable, extrapolations [1,2,3,4,6] of existing data (x 10 −5 ) and their respective fits, or the application [3] of QCD inspired models which proved to provide reliable high energy predictions [12,13,14] in the past [5,7]. In the present work we shall adopt this second option and base our predictions on calculations within the framework of the radiative parton model [12,13,14,15] which allows to calculate the small-x (x 10 −2 ) behavior of parton densities from first principles, i.e.…”

mentioning

confidence: 99%

Dynamical QCD predictions for ultrahigh energy neutrino cross sections

Glück

Kretzer

Reya

1999

Astroparticle Physics

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“…The subsequent W and Z gauge boson decays considered are those involving electrons, muons, neutrinos or jets. This analysis profits from an increase in statistics by more than a factor of 10 compared to previous H1 searches [2,3], and more than a factor of 4 compared to published results by the ZEUS collaboration [4].…”

Section: Introductionmentioning

confidence: 83%

A search for excited fermions at HERA

Adloff

2000

Eur. Phys. J. C

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A search for excited fermions f * of the first generation in e + p scattering at the collider HERA is presented using H1 data with an integrated luminosity of 37 pb −1 . All electroweak decays of excited fermions, f * → fγ, fW, fZ are considered and all possible final states resulting from the Z or W hadronic decays or decays into leptons of the first two generations are taken into account. No evidence for f * production is found. Mass dependent exclusion limits on cross-sections and on the ratio of coupling constants to the compositeness scale are derived.

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A search for leptoquarks, leptogluons and excited leptons in H1 at HERA

Cited by 111 publications

References 34 publications

The scale dependent nuclear effects in parton distributions for practical applications

The scale dependent nuclear effects in parton distributions for practical applications

Dynamical QCD predictions for ultrahigh energy neutrino cross sections

A search for excited fermions at HERA

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