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Parton distributions for LO calculations

15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007 (2007)

Authors:

RS Thorne, A Sherstnev, C Gwenlan

Abstract:

We present a study of the results obtained combining LO partonic matrix elements with different orders of partons distributions. These are compared to the best prediction using NLO for both matrix elements and parton distributions. The aim is to determine which parton distributions are most appropriate to use in those cases where only LO matrix elements are available, e.g. as in many Monte Carlo generators. Both LO and NLO parton distributions have faults so a modified optimal LO set is suggested.

Precise measurement of the W boson mass

Frascati Physics Series 44:SPEC. ISS. (2007) 231-242

Abstract:

The first measurement of the W boson mass (mW) hi Run 11 of the Tevatron Collider has been made by the CDF Collaboration, and is the single most precise mW measurement to date. The measurement of mW = 80.413 ± 0.048 GeV lias a relative precision of 0.06% and results in a new world-average mW of 80.398 ± 0.025 GeV. The precise knowledge of mW constrains the properties of new hypothetical particles coupling to electroweak gauge bosons.

Progress with vertex detector sensors for the International Linear Collider

NUCL INSTRUM METH A 582:3 (2007) 839-842

Authors:

S Worm, Y Banda, C Bowdery, C Buttar, P Clarke, D Cussans, C Damerell, G Davies, E Devetak, J Fopma, B Foster, R Gao, AR Gillman, J Goldstein, T Greenshaw, M Grimes, K Harder, B Hawes, H Heath, S Hillert, B Jeffery, E Johnson, N Kundu, V Martin, P Murray, A Nichols, A Nomerotski, V O'Shea, C Parkes, C Perry, T Woolliscroft, A Sopczak, K Stefanov, S Thomas, T Tikkanen, S Yang, Z Zhang

Abstract:

In the past year, the Linear Collider Flavour Identification (LCFI) Collaboration has taken significant steps towards having a sensor suitable for use in the silicon vertex detector of the International Linear Collider (ILC). The goal of the collaboration is to develop the sensors, electronic systems and mechanical support structures necessary for the construction of a high performance vertex detector and to investigate the contribution such a vertex detector can make to the physics accessible at the ILC. Particular highlights include the delivery and testing of both a second-generation column parallel CCD (CP-CCD), design of the next-generation readout ASIC (CPR2a) and a dedicated ASIC for driving the CP-CCD. This paper briefly describes these and other highlights. (c) 2007 Elsevier B.V. All rights reserved.
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Exclusive ρ0 production in deep inelastic scattering at HERA

PMC Physics A Springer Nature 1:1 (2007) 6
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Measurement of the tt̄ production cross section in pp̄ collisions at s=1.96TeV using kinematic characteristics of lepton+jets events

Physical Review D - Particles, Fields, Gravitation and Cosmology 76:9 (2007)

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, M Arthaud, A Askew, B Åsman, ACS Assis Jesus, O Atramentov, C Autermann, C Avila, C Ay, F Badaud, A Baden, L Bagby, B Baldin, DV Bandurin, S Banerjee, P Banerjee, E Barberis, AF Barfuss, P Bargassa, P Baringer, 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, C Biscarat, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, A Boehnlein, D Boline, 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, CP Buszello, JM Butler, P Calfayan, S Calvet, J Cammin, S Caron, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan

Abstract:

We present a measurement of the top quark pair production cross section in pp̄ collisions at s=1.96TeV utilizing 425pb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider. We consider the final state of the top quark pair containing one high-pT electron or muon and at least four jets. We exploit specific kinematic features of tt̄ events to extract the cross section. For a top quark mass of 175 GeV, we measure σtt̄=6.4-1.2+1. 3(stat)±0.7(syst)±0.4(lum)pb, in good agreement with the standard model prediction. © 2007 The American Physical Society.
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