Measurement of the inclusive jet cross section inpp¯collisions ats=1.96 TeV

Autor: Viacheslav Bunichev, Daniel Claes, Kaushik De, Kenneth Bloom, Peter Ratoff, Lee Sawyer, Andrew Haas, Michael Cooke, Sergey Burdin, Kin Yip, Christopher Tully, Oleg Brandt, Yuri Gershtein, Sijbrand De Jong, Stefan Soldner-Rembold, Md Naimuddin, Darren Price, Alexander Grohsjean, Aurelio Juste, Émilien Chapon, Frank Filthaut, Anatoly Evdokimov, Gilvan Alves, Michele Weber, Ivan Razumov, Pedro Galli Mercadante, Michael Wang, Lidija Zivkovic, Susan Blessing, Milos Lokajicek, Alice Bean, Wade Fisher, Andrew Brandt, Ursula Bassler, Bruce Hoeneisen, Murilo Rangel, Martin Grunewald, Harold Evans, Nikola Makovec, Camille Bélanger-Champagne, Iain Bertram, Paul Grannis, Enrique Camacho-Perez, Alexander Kozelov, Todd Adams, Greg Landsberg, Ivan Heredia de la Cruz, David Hedin, Frederic Deliot, Horst Wahl, Arnaud Duperrin, Arnd Meyer, Jianming Qian, George Alverson, Mark Williams, Lev Dudko, Liang Li, Markus Wobisch, Edgar Carrera Jarrin, Viatcheslav Sharyy, ANNA GOUSSIOU, Pengfei Ding, Maxim Titov, Elizaveta Shabalina, Shabnam Jabeen, Eric KAJFASZ, Smaïn Kermiche, Sergio Novaes, Harald Fox, Raymond Beuselinck, Madar Romain, Oleksandr Melnychuk, Patrice Verdier, Graham Wilson, Marc-André Pleier, Scott Snyder, Ann Heinson, Alberto Sanchez-Hernandez, Gerald Charles Blazey, Herman Diehl, Vladimir Gavrilov, Aaron Dominguez, Naba Mondal, Suneel Dutt, Jorge Martinez-Ortega, Karel Soustruznik, Masato Aoki, Jean-François Grivaz, Guennadi Borissov, Sudhir Malik
Rok vydání: 2012
Předmět:
Zdroj: Physical Review D. 85
ISSN: 1550-2368
1550-7998
DOI: 10.1103/physrevd.85.052006
Popis: This thesis studies the high-energy collisions of protons and antiprotons. The data used in the measurement were collected during 2004–2005 with the DO detector at the Tevatron Collider of the Fermi National Accelerator Laboratory and correspond to 0.7 fb−1 of integrated luminosity. High energy hadron collisions usually produce collimated sprays of particles called jets. The energy of the jets is measured using a liquid Argon-Uranium calorimeter and the production angle is determined with the help of silicon microstrip and scintillating fiber trackers. The inclusive jet cross section in proton-antiproton collisions is measured as a function of jet transverse momentum pT in six bins of jet rapidity at the center-of-mass energy √s = 1.96 TeV. The measurement covers jet transerve momenta from 50 GeV up to 600 GeV and jet rapidities up to |y| = 2.4. The data are collected using a set of seven single jet triggers. Event and jet cuts are applied to remove non-physical backgrounds and cosmic-ray interactions. The data are corrected for jet energy calibration, cut and trigger efficiencies and finite jet pT resolution. The corrections are determined from data and the methods are tested with Monte Carlo simulation. The main experimental challenges in the measurement are the calibration of jet energies and the determination of the jet pT resolution. New methods are developed for the jet energy calibration that take into account physical differences between the γ+jet and dijet calibration samples arising from quark and gluon jet differences. The uncertainty correlations are studied and provided as a set of uncertainty sources. The production of particle jets in hadron collisions is described by the theory of quantum chromodynamics (QCD). When the transverse jet momentum is large, the contributions from long-distance physics processes are small and the production rates of jets can be predicted by perturbative QCD. The inclusive jet cross section in pp collisions at large pT is directly sensitive to the strong coupling constant (αs) and the parton distribution functions (PDFs) of the proton. This measurement can be used to constrain the PDFs, in particular the gluon PDF at high proton momentum fraction x, and to look for quark substructure at the TeV scale. The data are compared to the theory predictions with perturbative QCD in the next-to-leading order precision and a good agreement between data and theory is observed.
Databáze: OpenAIRE
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