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Precise Study of the Z / γ * Boson Transverse Momentum Distribution in p p ¯ Collisions Using a Novel Technique

Journal article published in 2011 by 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 and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; Using 7.3 fb(-1) of p (p) over bar collisions collected by the D0 detector at the Fermilab Tevatron, we measure the distribution of the variable phi(eta)*, which probes the same physical effects as the Z/gamma* boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. A QCD prediction is found to describe the general features of the phi(eta)* distribution, but is unable to describe its detailed shape or dependence on boson rapidity. A prediction that includes a broadening of transverse momentum for small values of the parton momentum fraction is strongly disfavored.