Measurement of the normalized Z/γ*→μ+μ- transverse momentum distribution in pp collisions at √s=1.96 TeV

V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G. A. Alves, L. S. Ancu, M. Aoki, Y. Arnoud, M. Arov, A. Askew, B. Åsman, O. Atramentov, C. Avila, J. BackusMayesF. Badaud, L. Bagby, B. Baldin, D. V. Bandurin, S. Banerjee, E. Barberis, A. F. Barfuss, P. Baringer, J. Barreto, J. F. Bartlett, U. Bassler, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, J. A. Benitez, S. B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, G. Blazey, S. Blessing, K. Bloom, A. Boehnlein, D. Boline, T. A. Bolton, E. E. Boos, G. Borissov, T. Bose, A. Brandt, O. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, X. B. Bu, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, T. H. Burnett, C. P. Buszello, P. Calfayan, B. Calpas, S. Calvet, E. Camacho-Pérez, J. Cammin, M. A. Carrasco-Lizarraga, E. Carrera, B. C K Casey, H. 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Greenwood, E. M. Gregores, G. Grenier, Ph Gris, J. F. Grivaz, A. Grohsjean, S. Grünendahl, M. W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, P. Haefner, S. Hagopian, J. Haley, L. Han, K. Harder, A. Harel, J. M. Hauptman, J. Hays, T. Hebbeker, D. Hedin, A. P. Heinson, U. Heintz, C. Hensel, I. Heredia-De La Cruz, K. Herner, G. Hesketh, M. D. Hildreth, R. Hirosky, T. Hoang, J. D. Hobbs, B. Hoeneisen, M. Hohlfeld, S. Hossain, Y. Hu, Z. Hubacek, N. Huske, V. Hynek, I. Iashvili, R. Illingworth, A. S. Ito, S. Jabeen, M. Jaffré, S. Jain, D. Jamin, R. Jesik, K. Johns, M. Johnson, D. Johnston, A. Jonckheere, P. Jonsson, J. Joshi, A. Juste, K. Kaadze, E. Kajfasz, D. Karmanov, P. A. Kasper, I. Katsanos, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y. N. Kharzheev, D. Khatidze, M. H. Kirby, M. Kirsch, J. M. Kohli, A. V. Kozelov, J. Kraus, A. Kumar, A. Kupco, T. Kurča, V. A. Kuzmin, J. Kvita, S. Lammers, G. Landsberg, P. Lebrun, H. S. Lee, W. M. Lee, J. 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Abstract

We present a new measurement of the Z/γ* transverse momentum distribution in the range 0-330 GeV, in proton-antiproton collisions at s=1.96 TeV. The measurement uses 0.97 fb-1 of integrated luminosity recorded by the D0 experiment and is the first using the Z/γ*→μ+μ-+X channel at this center-of-mass energy. This is also the first measurement of the Z/γ* transverse momentum distribution that presents the result at the level of particles entering the detector, minimizing dependence on theoretical models. As any momentum of the Z/γ* in the plane transverse to the incoming beams must be balanced by some recoiling system, primarily the result of QCD radiation in the initial state, this variable is an excellent probe of the underlying process. Tests of the predictions of QCD calculations and current event generators show they have varied success in describing the data. Using this measurement as an input to theoretical predictions will allow for a better description of hadron collider data and hence it will increase experimental sensitivity to rare signals.

Original languageEnglish (US)
Pages (from-to)522-530
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume693
Issue number5
DOIs
StatePublished - Oct 18 2010

Bibliographical note

Funding Information:
We thank Zhao Li, Mike Seymour, Frank Siegert, Peter Skands and Chien-Peng Yuan for very useful discussions on the theoretical calculations. We thank the staffs at Fermilab and collaborating institutions, and acknowledge support from the DOE and NSF (USA); CEA and CNRS/IN2P3 (France); FASI , Rosatom and RFBR (Russia); CNPq , FAPERJ , FAPESP and FUNDUNESP (Brazil); DAE and DST (India); Colciencias (Colombia); CONACyT (Mexico); KRF and KOSEF (Korea); CONICET and UBACyT (Argentina); FOM (The Netherlands); STFC and the Royal Society (United Kingdom); MSMT and GACR (Czech Republic); CRC Program and NSERC (Canada); BMBF and DFG (Germany); SFI (Ireland); The Swedish Research Council (Sweden); and CAS and CNSF (China).

Keywords

  • Differential cross section
  • Event generators
  • Monte Carlo models
  • Perturbative QCD
  • Z bosons

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