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Photoproduction of events with rapidity gaps between jets at HERA

ArXiv hep-ex/0612008 (2006)

Authors:

ZEUS Collaboration, S Chekanov
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Doubly-charged higgs bosons

Chapter in Search for the Higgs Boson, (2006) 1-25

Abstract:

The standard model includes a Higgs weak doublet whose vacuum expectation value results in the masses of the observed particles. A number of models also predict a Higgs weak triplet, which includes a doubly-charged Higgs boson (H±±). The existence of such a boson could be inferred indirectly by its exchange in measured processes, or observed directly through its production and decay. Measurements of Bhabha scattering, tau decay, muon decay, and (g - 2)μ provide indirect limits on H±± couplings to charged leptons. Direct H±± searches have been performed in e+e- collisions at the Large Electron Positron collider (LEP) and in pp collisions at the Fermilab Tevatron. The highest mass limits for exclusive H±± couplings to electrons and muons, and for long-lived H±±, are obtained by the Collider Detector at Fermilab (CDF), while the DELPHI detector at CERN obtains the highest mass limits for H±± couplings to taus. Future data at the Tevatron, Large Hadron Collider, and International Linear Collider will increase sensitivity to H±± mass and couplings by about an order of magnitude. © 2006 Nova Science Publishers, Inc. All rights reserved.

Measurement of the tt̄ production cross section in pp̄ collisions at s=1.96TeV using secondary vertex b tagging

Physical Review D - Particles, Fields, Gravitation and Cosmology 74:11 (2006)

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, E Aguilo, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, LS Ancu, T Andeen, S Anderson, B Andrieu, MS Anzelc, Y Arnoud, M Arov, A Askew, BA Asman, ACS Assis Jesus, O Atramentov, C Autermann, C Avila, C Ay, F Badaud, A Baden, L Bagby, B Baldin, DV Bandurin, P Banerjee, S Banerjee, E Barberis, P Bargassa, P Baringer, C Barnes, J Barreto, JF Bartlett, U Bassler, D Bauer, S Beale, A Bean, M Begalli, M Begel, C Belanger-Champagne, L Bellantoni, A Bellavance, JA Benitez, SB Beri, G Bernardi, R Bernhard, L Berntzon, I Bertram, M Besançon, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, M Binder, C Biscarat, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, U Blumenschein, A Boehnlein, TA Bolton, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, D Brown, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, S Burke, TH Burnett, E Busato, CP Buszello, JM Butler, P Calfayan, S Calvet, J Cammin, S Caron, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti

Abstract:

We report a new measurement of the tt̄ production cross section in pp̄ collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. Using 425pb-1 of data collected using the D0 detector at the Fermilab Tevatron Collider, and enhancing the tt̄ content of the sample by tagging b jets with a secondary vertex tagging algorithm, the tt̄ production cross section is measured to be σpp̄→tt̄+X=6.6±0.9(stat+syst) ±0.4(lum)pb. This cross section is the most precise D0 measurement to date for tt̄ production and is in good agreement with standard model expectations. © 2006 The American Physical Society.
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Online system for normalizing data acquired by the Fermilab DØ experiment

Journal of the Korean Physical Society 49:6 (2006) 2247-2252

Authors:

SK Park, J Park, S Lee, SH Ahn, SJ Hong, TJ Kim, KS Lee, M Begel, T Andeen, H Schellman, J Stein, S Yacoob, E Gallas, V Sirotenko, J Hauptman, G Snow

Abstract:

The DØ experiment uses a dedicated data acquisition system to collect, archive, monitor, and distribute the information necessary to normalize triggered data for physics analyses. This system has been in place since the beginning of Run 2 of the Fermilab Tevatron collider in 2001 and provides real-time feedback on the instantaneous and triggered luminosities in the DØ and Tevatron control rooms, as well as the status reports needed for smooth operation of the experiment. This paper describes the architecture and the implementation of this system.
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The barrel modules of the ATLAS semiconductor tracker

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 568:2 (2006) 642-671

Authors:

A Abdesselam, T Akimoto, PP Allport, J Alonso, B Anderson, L Andricek, F Anghinolfi, RJ Apsimon, G Barbier, AJ Barr, LE Batchelor, RL Bates, JR Batley, GA Beck, PJ Bell, A Belymam, J Bernabeu, S Bethke, JP Bizzell, J Bohm, R Brenner, TJ Brodbeck, Z Broklova, J Broz, P Bruckman De Renstrom, CM Buttar, JM Butterworth, C Carpentieri, AA Carter, JR Carter, DG Charlton, A Cheplakov, E Chesi, A Chilingarov, S Chouridou, ML Chu, V Cindro, A Ciocio, JV Civera, A Clark, P Coe, AP Colijn, T Cornelissen, DP Cosgrove, MJ Costa, W Dabrowski, J Dalmau, KM Danielsen, I Dawson, B Demirkoz, P Dervan, Z Dolezal, M Donega, M D'Onofrio, O Dorholt, JD Dowell, Z Drasal, IP Duerdoth, M Dwuznik, S Eckert, T Ekelof, L Eklund, C Escobar, V Fadeyev, L Feld, P Ferrari, D Ferrere, L Fiorini, R Fortin, JM Foster, H Fox, TJ Fraser, J Freestone, R French, J Fuster, S Gadomski, BJ Gallop, C García, JE Garcia-Navarro, MD Gibson, S Gibson, MGD Gilchriese, J Godlewski, S Gonzalez-Sevilla, MJ Goodrick, A Gorisek, E Gornicki, A Greenall, C Grigson, AA Grillo, J Grosse-Knetter, C Haber, K Hara, FG Hartjes, D Hauff, BM Hawes, SJ Haywood, NP Hessey, A Hicheur, JC Hill

Abstract:

This paper describes the silicon microstrip modules in the barrel section of the SemiConductor Tracker (SCT) of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The module requirements, components and assembly techniques are given, as well as first results of the module performance on the fully assembled barrels that make up the detector being installed in the ATLAS experiment. © 2006 Elsevier B.V. All rights reserved.
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