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Title: Status of the observed and predicted bb production at the Fermilab Tevatron

Abstract

We review the experimental status of the b-quark production at the Fermilab Tevatron. We compare all available measurements to perturbative QCD predictions (NLO and FONLL) and also to the parton-level cross section evaluated with parton-shower Monte Carlo generators. We examine both the single b cross section and the so called bb correlations. The review shows that the experimental situation is quite complicated because the measurements appear to be inconsistent among themselves. In this situation, there is no solid basis to either claim that perturbative QCD is challenged by these measurements or, in contrast, that long-standing discrepancies between data and theory have been resolved by incrementally improving the measurements and the theoretical prediction.

Authors:
;  [1];  [2]
  1. Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati (Italy)
  2. University of Cyprus, 1678 Nicosia (Cyprus)
Publication Date:
OSTI Identifier:
20774611
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.014026; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B QUARKS; CASCADE SHOWERS; COMPARATIVE EVALUATIONS; CORRELATIONS; CROSS SECTIONS; FERMILAB TEVATRON; FORECASTING; INCLUSIVE INTERACTIONS; MONTE CARLO METHOD; PARTICLE PRODUCTION; PROTON-PROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; REVIEWS

Citation Formats

Happacher, F., Giromini, P., and Ptohos, F. Status of the observed and predicted bb production at the Fermilab Tevatron. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.014026.
Happacher, F., Giromini, P., & Ptohos, F. Status of the observed and predicted bb production at the Fermilab Tevatron. United States. doi:10.1103/PhysRevD.73.014026.
Happacher, F., Giromini, P., and Ptohos, F. Sun . "Status of the observed and predicted bb production at the Fermilab Tevatron". United States. doi:10.1103/PhysRevD.73.014026.
@article{osti_20774611,
title = {Status of the observed and predicted bb production at the Fermilab Tevatron},
author = {Happacher, F. and Giromini, P. and Ptohos, F.},
abstractNote = {We review the experimental status of the b-quark production at the Fermilab Tevatron. We compare all available measurements to perturbative QCD predictions (NLO and FONLL) and also to the parton-level cross section evaluated with parton-shower Monte Carlo generators. We examine both the single b cross section and the so called bb correlations. The review shows that the experimental situation is quite complicated because the measurements appear to be inconsistent among themselves. In this situation, there is no solid basis to either claim that perturbative QCD is challenged by these measurements or, in contrast, that long-standing discrepancies between data and theory have been resolved by incrementally improving the measurements and the theoretical prediction.},
doi = {10.1103/PhysRevD.73.014026},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • The authors review the experimental status of the b-quark production at the Fermilab Tevatron. They compare all available measurements to perturbative QCD predictions (NLO and FONLL) and also to the parton-level cross section evaluated with parton-shower Monte Carlo generators. They examine both the single b cross section and the so called b{bar b} correlations. The review shows that the experimental situation is quite complicated because the measurements appear to be inconsistent among themselves. In this situation, there is no solid basis to either claim that perturbative QCD is challenged by these measurements or, in contrast, that long-standing discrepancies between datamore » and theory have been resolved by incrementally improving the measurements and the theoretical prediction.« less
  • The authors address known discrepancies between the heavy flavor properties of jets produced at the Tevatron collider and the prediction of conventional-QCD simulations. In this study, they entertain the possibility that these effects are real and due to new physics. They show that all anomalies can be simultaneously fitted by postulating the additional pair production of light bottom squarks with a 100% semileptonic branching fraction.
  • We address known discrepancies between the heavy-flavor properties of jets produced at the Tevatron collider and the prediction of conventional-QCD simulations. In this study, we entertain the possibility that these effects are real and due to new physics. We show that all anomalies can be simultaneously fitted by postulating the additional pair production of light bottom squarks with a 100% semileptonic branching fraction.
  • We consider b-jet hadroproduction in the quasi-multi-Regge-kinematics approach based on the hypothesis of gluon and quark Reggeization in t-channel exchanges at high energies. The preliminary data on inclusive b-jet and bb-dijet production taken by the CDF Collaboration at the Fermilab Tevatron are well described without adjusting parameters. We find the main contribution to inclusive b-jet production to be the scattering of a Reggeized gluon and a Reggeized b quark to a b quark, which is described by the effective Reggeon-Reggeon-quark vertex. The main contribution to bb-pair production arises from the scattering of two Reggeized gluons to a bb pair, whichmore » is described by the effective Reggeon-Reggeon-quark-quark vertex. Our analysis is based on the Kimber-Martin-Ryskin prescription for unintegrated gluon and quark distribution functions using as input the Martin-Roberts-Stirling-Thorne collinear parton distribution functions of the proton.« less
  • The luminosity of the Tevatron proton-antiproton collider is analzyed in the context of the Fermilab III project. The exact scope of the Fermilab III project is still under discussion, but the focus is to increase the collider luminosity at minimal cost. {copyright} {ital 1996 American Institute of Physics.}