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Search for ZZ and ZW Production in ppbar Collisions at sqrt(s) = 1.96 TeV

ArXiv hep-ex/0501021 (2005)
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A measurement of the τ lifetime

The European Physical Journal C 39:3 (2005) 331-337

Authors:

W Braunschweig, R Gerhards, FJ Kirschfink, HU Martyn, B Bock, HM Fischer, H Hartmann, J Hartmann, E Hilger, A Jocksch, R Wedemeyer, B Foster, AJ Martin, AJ Sephton, E Bernardi, J Chwastowski, A Eskreys, K Gather, K Genser, H Hultschig, P Joos, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, JM Pawlak, KU Pösnecker, E Ros, W Schütte, D Trines, R Walczak, G Wolf, H Kolanoski, T Kracht, J Krüger, E Lohrmann, G Poelz, W Zeuner, DM Binnie, J Hassard, J Shulman, D Su, F Barreiro, A Leites, J del Peso, C Balkwill, MG Bowler, PN Burrows, RJ Cashmore, GP Heath, DJ Mellor, P Ratoff, I Silvester, I Tomalin, E Veitch, GE Forden, JC Hart, DH Saxon, S Brandt, M Holder, L Labarga, Y Eisenberg, U Karshon, G Mikenberg, A Montag, D Revel, E Ronat, A Shapira, N Wainer, G Yekutieli, A Caldwell, D Muller, S Ritz, D Strom, M Takashima, E Wicklund, SL Wu, G Zobernig

Abstract:

We have reconstructed 695 three-track τ decay vertices using a high resolution drift chamber close to the interaction point. From the distribution of decay lengths we measure the lifetime to be (3.06 ±0.20±0.14)×10-13 s. Using this result we find that the ratio of charged weak coupling constant for the τ to that of the μ, G τ/G μ=0.967±0.040 consistent with the concept of lepton universality. © 1988 Springer-Verlag.
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Detector concepts

LCWS 2005 - 2005 International Linear Collider Workshop (2005)

Authors:

G Aarons, T Abe, J Abernathy, M Ablikim, H Abramowicz, D Adey, C Adloff, C Adolphsen, K Afanaciev, I Agapov, JK Ahn, H Aihara, M Akemoto, M Del CarmenAlabau, J Albert, H Albrecht, M Albrecht, D Alesini, G Alexander, J Alexander, W Allison, J Amann, R Amirikas, Q An, S Anami, B Ananthanarayan, T Anderson, L Andricek, M Anduze, M Anerella, N Anfimov, D Angal-Kalinin, S Antipov, C Antoine, M Aoki, A Aoza, S Aplin, R Appleby, Y Arai, S Araki, T Arkan, N Arnold, R Arnold, R Arnowitt, X Artru, K Arya, A Aryshev, E Asakawa, F Asiri, D Asner, M Atac, G Atoian, D Attié, JE Augustin, DB Augustine, B Ayres, T Aziz, D Baars, F Badaud, N Baddams, J Bagger, S Bai, D Bailey, IR Bailey, D Baker, NI Balalykin, JP Balbuena, JL Baldy, M Ball, M Ball, A Ballestrero, J Ballin, C Baltay, P Bambade, S Ban, H Band, K Bane, B Banerjee, S Barbanotti, D Barbareschi, A Barbaro-Galtieri, DP Barber, M Barbi, DY Bardin, B Barish, TL Barklow, R Barlow, VE Barnes, M Barone, C Bartels, V Bartsch, R Basu, M Battaglia, Y Batygin, J Baudot, U Baur, DE Baynham, C Beard, C Bebek, P Bechtle

Experimental determination of parton distributions

HERA and the LHC: A Workshop on the Implications of HERA for LHC Physics, HERA-LHC 2005 - Proceedings (2005) 78-118

Authors:

T Carli, A Cooper-Sarkar, J Feltesse, A Glazov, C Gwenlan, M Klein, T Laštovička, G Laštovička-Medin, S Moch, B Reisert, G Salam, F Siegert

Introduction to parton distribution functions

HERA and the LHC: A Workshop on the Implications of HERA for LHC Physics, HERA-LHC 2005 - Proceedings (2005) 43-45

Authors:

M Dittmar, S Forte, A Glazov, S Moch, S Alekhin, G Altarelli, J Andersen, RD Ball, J Blümlein, H Böttcher, T Carli, M Ciafaloni, D Colferai, A Cooper-Sarkar, G Corcella, L Del Debbio, G Dissertori, J Feltesse, A Guffanti, C Gwenlan, J Huston, G Ingelman, M Klein, T Laštovička, G Laštovička-Medin, JI Latorre, L Magnea, A Piccione, J Pumplin, V Ravindran, B Reisert, J Rojo, AS Vera, GP Salam, F Siegert, A Staśto, H Stenzel, C Targett-Adams, RS Thorne, A Tricoli, JAM Vermaseren, A Vogt

Abstract:

We provide an assessment of the impact of parton distributions on the determination of LHC processes, and of the accuracy with which parton distribution functions (PDFs) can be extracted from data, in particular from current and forthcoming HERA experiments. We give an overview of reference LHC processes and their associated PDF uncertainties, and study in detail W and Z production at the LHC. We discuss the precision which may be obtained from the analysis of existing HERA data, tests of consistency of HERA data from different experiments, and the combination of these data. We determine further improvements on PDFs which may be obtained from future HERA data (including measurements of FL), and from combining present and future HERA data with present and future hadron collider data. We review the current status of knowledge of higher (NNLO) QCD corrections to perturbative evolution and deep-inelastic scattering, and provide reference results for their impact on parton evolution, and we briefly examine non-perturbative models for parton distributions. We discuss the state-of-the art in global parton fits, we assess the impact on them of various kinds of data and of theoretical corrections, by providing benchmarks of Alekhin and MRST parton distributions and a CTEQ analysis of parton fit stability, and we briefly present proposals for alternative approaches to parton fitting. We summarize the status of large and small x resummation, by providing estimates of the impact of large x resummation on parton fits, and a comparison of different approaches to small x resummation, for which we also discuss numerical techniques.