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Measurement of the ratios of the Z / γ* + ≥ n jet production cross sections to the total inclusive Z / γ* cross section in p over(p, -) collisions at sqrt(s) = 1.96  TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 658:4 (2008) 112-119

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, M Agelou, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, T Andeen, S Anderson, B Andrieu, MS Anzelc, Y Arnoud, M Arov, A Askew, B Åsman, ACSA 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, 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, KM Black, I Blackler, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, U Blumenschein, A Boehnlein, O Boeriu, 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, D Chakraborty

Abstract:

We present a study of events with Z bosons and associated jets produced at the Fermilab Tevatron collider in p over(p, ̄) collisions at a center of mass energy of 1.96 TeV. The data sample consists of nearly 14 000 Z / γ* → e+ e- candidates corresponding to an integrated luminosity of 0.4 fb-1 collected with the DØ detector. Ratios of the Z / γ* + ≥ n jet cross sections to the total inclusive Z / γ* cross section have been measured for n = 1 - 4 jets, and found to be in good agreement with a next-to-leading order QCD calculation and with a tree-level QCD prediction with parton shower simulation and hadronization.
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Alignment of the pixel and SCT modules for the 2004 ATLAS combined test beam

Journal of Instrumentation 3:9 (2008)

Authors:

A Ahmad, A Andreazza, T Atkinson, J Baines, AJ Barr, R Beccherle, PJ Bell, J Bernabeu, Z Broklova, PA Bruckman De Renstrom, D Cauz, L Chevalier, S Chouridou, M Citterio, A Clark, M Cobal, T Cornelissen, S Correard, MJ Costa, D Costanzo, S Cuneo, M Dameri, G Darbo, JB De Vivie, B Di Girolamo, D Dobos, Z Drasal, J Drohan, K Einsweiler, M Elsing, D Emelyanov, C Escobar, K Facius, P Ferrari, D Fergusson, D Ferrere, T Flick, D Froidevaux, G Gagliardi, M Gallas, BJ Gallop, KK Gan, C Garcia, IL Gavrilenko, C Gemme, P Gerlach, T Golling, S Gonzalez-Sevilla, MJ Goodrick, G Gorfine, T Göttfert, J Grosse-Knetter, PH Hansen, K Hara, R Härtel, A Harvey, RJ Hawkings, FEW Heinemann, T Henss, JC Hill, F Huegging, E Jansen, J Joseph, M Karagöz Ünel, M Kataoka, S Kersten, A Khomich, R Klingenberg, P Kodys, T Koffas, N Konstantinidis, V Kostyukhin, C Lacasta, T Lari, S Latorre, CG Lester, W Liebig, A Lipniacka, KF Lourerio, M Mangin-Brinet, S Marti I Garcia, M Mathes, C Meroni, B Mikulec, B Mindur, S Moed, G Moorhead, P Morettini, EWJ Moyse, K Nakamura, P Nechaeva, K Nikolaev, F Parodi, S Parzhitskiy, J Pater, R Petti, PW Phillips, B Pinto, A Poppleton

Abstract:

A small set of final prototypes of the ATLAS Inner Detector silicon tracking system (Pixel Detector and SemiConductor Tracker), were used to take data during the 2004 Combined Test Beam. Data were collected from runs with beams of different flavour (electrons, pions, muons and photons) with a momentum range of 2 to 180 GeV/c. Four independent methods were used to align the silicon modules. The corrections obtained were validated using the known momenta of the beam particles and were shown to yield consistent results among the different alignment approaches. From the residual distributions, it is concluded that the precision attained in the alignment of the silicon modules is of the order of 5 μm in their most precise coordinate. © 2008 IOP Publishing Ltd and SISSA.
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Extraction of the proton PDFs using a NLO-QCD fit of the combined H1 and ZEUS inclusive DIS cross sections

ScienceWise Publishing (2008)
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First data from the linear collider alignment and survey project (LiCAS)

EPAC 2008 - Contributions to the Proceedings (2008) 1344-1346

Authors:

A Reichold, P Brockill, S Cohen, J Dale, M Dawson, T Handford, M Jones, G Moss, LA Rainbow, M Tacon, CU Estrada, D Urner, R Wastie, S Yang, J Prenting, M Schlösser, G Grzelak

Abstract:

The LiCAS project has developed a prototype robotic survey system for rapid and highly accurate surveying of long linear accelerator tunnel networks. It is aimed at the International Linear Collider (ILC). This Rapid Tunnel Reference Surveyor (RTRS) is an R&D instrument for evaluating the performance of the RTRS concept and its survey technology. The prototype has been commissioned in a test tunnel at DESY with initial calibrations and measurements ongoing. We will report recent results where they improve over previously reported work.

Measurement of isolated photon production in deep-inelastic scattering at HERA

European Physical Journal C 54:3 (2008) 371-387

Authors:

FD Aaron, A Aktas, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, S Baudrand, M Beckingham, K Begzsuren, O Behnke, O Behrendt, A Belousov, N Berger, JC Bizot, MO Boenig, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, FW Büsser, A Bunyatyan, G Buschhorn, L Bystritskaya, AJ Campbell, KB Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, JG Contreras, JA Coughlan, G Cozzika, J Cvach, JB Dainton, K Daum, M Deak, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, EA De Wolf, C Diaconu, V Dodonov, A Dubak, G Eckerlin, V Efremenko, S Egli, R Eichler, F Eisele, A Eliseev, E Elsen, S Essenov, A Falkiewicz, PJW Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, L Finke, M Fleischer, A Fomenko, G Franke, T Frisson, E Gabathuler, J Gayler, S Ghazaryan, S Ginzburgskaya, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, S Gorbounov, M Gouzevitch, C Grab, T Greenshaw, BR Grell, G Grindhammer, S Habib, D Haidt, M Hansson, G Heinzelmann, C Helebrant, RCW Henderson, H Henschel, G Herrera, M Hildebrandt

Abstract:

The production of isolated photons in deep-inelastic scattering ep→eγX is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 450 GeV. The analysis is based on a total integrated luminosity of 227 pb-1. The production cross section of isolated photons with a transverse energy in the range 3
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