Professor Dr.rer.nat. Dipl.Phys. Alfons Weber FInstP, MA Ox: Publications

Precision electroweak measurements on the Z resonance

Physics Reports 427:5-6 (2006) 257-454

Authors:

JA Bagger, M Grünewald, S Schael, R Barate, R Brunelière, D Buskulic, I De Bonis, D Decamp, P Ghez, C Goy, S Jézéquel, JP Lees, A Lucotte, F Martin, E Merle, MN Minard, JY Nief, P Odier, B Pietrzyk, B Trocmé, S Bravo, MP Casado, M Chmeissani, P Comas, JM Crespo, E Fernandez, M Fernandez-Bosman, L Garrido, E Grauges, A Juste, M Martinez, G Merino, R Miquel, LM Mir, S Orteu, A Pacheco, IC Park, J Perlas, I Riu, H Ruiz, F Sanchez, A Colaleo, D Creanza, N De Filippis, M De Palma, G Iaselli, G Maggi, M Maggi, S Nuzzo, A Ranieri, G Raso, F Ruggieri, G Selvaggi, L Silvestris, P Tempesta, A Tricomi, G Zito, X Huang, J Lin, Q Ouyang, T Wang, Y Xie, R Xu, S Xue, J Zhang, L Zhang, W Zhao, D Abbaneo, A Bazarko, U Becker, G Boix, F Bird, E Blucher, B Bonvicini, P Bright-Thomas, T Barklow, O Buchmüller, M Cattaneo, F Cerutti, V Ciulli, B Clerbaux, H Drevermann, RW Forty, M Frank, TC Greening, R Hagelberg, AW Halley, F Gianotti, M Girone, JB Hansen, J Harvey, R Jacobsen, DE Hutchcroft, P Janot, B Jost, J Knobloch, M Kado, I Lehraus, P Lazeyras, P Maley

Abstract:

We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, mZ and ΓZ, and its couplings to fermions, for example the ρ parameter and the effective electroweak mixing angle for leptons, are precisely measured: mZ = 91.1875 ± 0.0021 GeV, ΓZ = 2.4952 ± 0.0023 GeV, ρl = 1.0050 ± 0.0010, sin² θ^lept eff = 0.23153 ± 0.00016. The number of light neutrino species is determined to be 2.9840 ± 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, mt = 173⁺¹³ -10 GeV, and the mass of the W boson, mW = 80.363 ± 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of mt and mW, the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level.

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First observations of separated atmospheric ν_μ and (ν)over-bar_μ events in the MINOS detector

PHYSICAL REVIEW D 73:7 (2006) ARTN 072002

Authors:

P Adamson, T Alexopoulos, WWM Allison, GJ Alner, K Anderson, C Andreopoulos, M Andrews, R Andrews, C Arroyo, S Avvakumov, DS Ayres, B Baller, B Barish, MA Barker, PD Jr Barnes, G Barr, WL Barrett, E Beall, BR Becker, A Belias, T Bergfeld, RH Bernstein, D Bhattacharya, M Bishai, A Blake, V Bocean, B Bock, GJ Bock, J Boehm, DJ Boehnlein, D Bogert, PM Border, C Bower, S Boyd, E Buckley-Geer, A Byon-Wagner, A Cabrera, JD Chapman, TR Chase, SK Chernichenko, S Childress, BC Choudhary, JH Cobb, JD Cossairt, H Courant, DA Crane, AJ Culling, JW Dawson, DM DeMuth, A De Santo, M Dierckxsens, MV Diwan, M Dorman, G Drake, R Ducar, T Durkin, AR Erwin, CO Escobar, J Evans, OD Fackler, EF Harris, GJ Feldman, N Felt, TH Fields, R Ford, MV Frohne, HR Gallagher, M Gebhard, A Godley, J Gogos, MC Goodman, Y Gornushkin, P Gouffon, E Grashorn, N Grossman, JJ Grudzinski, K Grzelak, V Guarino, A Habig, R Halsall, J Hanson, D Harris, PG Harris, J Hartnell, EP Hartouni, R Hatcher, K Heller, N Hill, Y Ho, C Howcroft, J Hylen, M Ignatenko, D Indurthy, GM Irwin, C James, L Jenner, D Jensen, T Joffe-Minor, T Kafka, HJ Kang, SMS Kasahara, J Kilmer, H Kim, G Koizumi, S Kopp, M Kordosky, DJ Koskinen, M Kostin, DA Krakauer, S Kumaratunga, AS Ladran, K Lang, C Laughton, A Lebedev, R Lee, WY Lee, MA Libkind, J Liu, PJ Litchfield, RP Litchfield, NP Longley, P Lucas, W Luebke, S Madani, E Maher, V Makeev, WA Mann, A Marchionni, AD Marino, ML Marshak, JS Marshall, J McDonald, A McGowan, JR Meier, GI Merzon, MD Messier, DG Michael, RH Milburn, JL Miller, WH Miller, SR Mishra, PS Miyagawa, C Moore, J Morfín, R Morse, L Mualem, S Mufson, S Murgia, MJ Murtagh, J Musser, D Naples, C Nelson, JK Nelson, HB Newman, F Nezrick, RJ Nichol, TC Nicholls, JP Ochoa-Ricoux, J Oliver, WP Oliver, VA Onuchin, T Osiecki, R Ospanov, J Paley, V Paolone, A Para, T Patzak, Z Pavlovich, GF Pearce, N Pearson, CW Peck, C Perry, EA Peterson, DA Petyt, H Ping, R Piteira, A Pla-Dalmau, RK Plunkett, LE Price, M Proga, DR Pushka, D Rahman, RA Rameika, TM Raufer, AL Read, B Rebel, DE Reyna, C Rosenfeld, HA Rubin, K Ruddick, VA Ryabov, R Saakyan, MC Sanchez, N Saoulidou, J Schneps, PV Schoessow, P Schreiner, R Schwienhorst, VK Semenov, SM Seun, P Shanahan, PD Shield, W Smart, V Smirnitsky, C Smith, PN Smith, A Sousa, B Speakman, P Stamoulis, A Stefanik, P Sullivan, JM Swan, PA Symes, N Tagg, RL Talaga, E Tetteh-Lartey, J Thomas, J Thompson, MA Thomson, JL Thron, R Trendler, J Trevor, I Trostin, VA Tsarev, G Tzanakos, J Urheim, P Vahle, M Vakili, K Vaziri, C Velissaris, V Verebryusov, B Viren, L Wai, CP Ward, DR Ward, M Watabe, A Weber, RC Webb, A Wehmann, N West, C White, RF White, SG Wojcicki, DM Wright, QK Wu, WG Yan, T Yang, FX Yumiceva, JC Yun, H Zheng, M Zois, R Zwaska

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The MINOS calibration detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 556:1 (2006) 119-133

Authors:

AJ Weber, P. Adamson, G. Crone, L. Jenner

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First Observations of Separated Atmospheric Muon Neutrino and Muon Anti-Neutrino Events in the MINOS Detector

ArXiv hep-ex/0512036 (2005)

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Measurement of the Mass and the Width of the W Boson at LEP

ArXiv hep-ex/0511049 (2005)

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Professor Dr.rer.nat. Dipl.Phys. Alfons Weber FInstP, MA Ox

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Precision electroweak measurements on the Z resonance

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First observations of separated atmospheric ν_μ and (ν)over-bar_μ events in the MINOS detector

Authors:

The MINOS calibration detector

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First Observations of Separated Atmospheric Muon Neutrino and Muon Anti-Neutrino Events in the MINOS Detector

Measurement of the Mass and the Width of the W Boson at LEP

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Professor Dr.rer.nat. Dipl.Phys. Alfons Weber FInstP, MA Ox

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Precision electroweak measurements on the Z resonance

Authors:

Abstract:

First observations of separated atmospheric νμ and (ν)over-barμ events in the MINOS detector

Authors:

The MINOS calibration detector

Authors:

First Observations of Separated Atmospheric Muon Neutrino and Muon Anti-Neutrino Events in the MINOS Detector

Measurement of the Mass and the Width of the W Boson at LEP

First observations of separated atmospheric ν_μ and (ν)over-bar_μ events in the MINOS detector