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Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at s=1.8TeV

Publication ,  Journal Article
Acosta, D; Affolder, T; Albrow, MG; Ambrose, D; Amidei, D; Anikeev, K; Antos, J; Apollinari, G; Arisawa, T; Artikov, A; Ashmanskas, W; Cauz, D ...
Published in: Physical Review D - Particles, Fields, Gravitation and Cosmology
2005

We have measured the azimuthal angular correlation of bb̄ production, using 86.5pb-1 of data collected by Collider Detector at Fermilab (CDF) in pp̄ collisions at s=1.8TeV during 1994-1995. In high-energy pp̄ collisions, such as at the Tevatron, bb̄ production can be schematically categorized into three mechanisms. The leading-order (LO) process is "flavor creation," where both b and b̄ quarks substantially participate in the hard scattering and result in a distinct back-to-back signal in final state. The "flavor excitation" and the "gluon splitting" processes, which appear at next-leading-order (NLO), are known to make a comparable contribution to total bb̄ cross section, while providing very different opening angle distributions from the LO process. An azimuthal opening angle between bottom and antibottom, Δ, has been used for the correlation measurement to probe the interaction creating bb̄ pairs. The Δ distribution has been obtained from two different methods. One method measures the Δ between bottom hadrons using events with two reconstructed secondary vertex tags. The other method uses bb̄→(J/ ψX)(X′) events, where the charged lepton () is an electron (e) or a muon (μ), to measure Δ between bottom quarks. The bb̄ purity is determined as a function of Δ by fitting the decay length of the J/ψ and the impact parameter of the. Both methods quantify the contribution from higher-order production mechanisms by the fraction of the bb̄ pairs produced in the same azimuthal hemisphere, ftoward. The measured ftoward values are consistent with both parton shower Monte Carlo and NLO QCD predictions. © 2005 The American Physical Society.

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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

ISSN

1550-7998

Publication Date

2005

Volume

71

Issue

9

Start / End Page

1 / 39

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Acosta, D., Affolder, T., Albrow, M. G., Ambrose, D., Amidei, D., Anikeev, K., … Zucchelli, S. (2005). Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at s=1.8TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology, 71(9), 1–39. https://doi.org/10.1103/PhysRevD.71.092001
Acosta, D., T. Affolder, M. G. Albrow, D. Ambrose, D. Amidei, K. Anikeev, J. Antos, et al. “Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at s=1.8TeV.” Physical Review D - Particles, Fields, Gravitation and Cosmology 71, no. 9 (2005): 1–39. https://doi.org/10.1103/PhysRevD.71.092001.
Acosta D, Affolder T, Albrow MG, Ambrose D, Amidei D, Anikeev K, et al. Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at s=1.8TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2005;71(9):1–39.
Acosta, D., et al. “Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at s=1.8TeV.” Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 71, no. 9, 2005, pp. 1–39. Scival, doi:10.1103/PhysRevD.71.092001.
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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

ISSN

1550-7998

Publication Date

2005

Volume

71

Issue

9

Start / End Page

1 / 39

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences