William B. Kilgore
Brookhaven National Laboratory
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Featured researches published by William B. Kilgore.
Physical Review Letters | 2002
Robert V. Harlander; William B. Kilgore
The Higgs-boson production cross section at pp and pp colliders is calculated in QCD at next-to-next-to-leading order (NNLO). We find that the perturbative expansion of the production cross section is well behaved and that scale dependence is reduced relative to the NLO result. These findings give us confidence in the reliability of the prediction. We also report an error in the NNLO correction to Drell-Yan production.
Physical Review D | 2003
Robert V. Harlander; William B. Kilgore
The total cross section for Higgs boson production in bottom-quark annihilation is evaluated at next-to-next-to-leading order in QCD. This is the first time that all terms at order
Physical Review D | 1999
Zvi Bern; Vittorio Del Duca; William B. Kilgore; C. Schmidt
{\ensuremath{\alpha}}_{s}^{2}
Journal of High Energy Physics | 2002
Robert V. Harlander; William B. Kilgore
are taken into account. We find a greatly reduced scale dependence with respect to lower order results, for both the factorization and the renormalization scales. The behavior of the result is consistent with earlier determinations of the appropriate factorization scale for this process of
Physical Review Letters | 2001
V. Del Duca; William B. Kilgore; C. Oleari; C. Schmidt; D. Zeppenfeld
{\ensuremath{\mu}}_{F}\ensuremath{\approx}{M}_{H}/4,
Physical Review D | 2001
Robert V. Harlander; William B. Kilgore
and supports the validity of the bottom parton density approach for computing the total inclusive rate. We present precise predictions for the cross section at the Fermilab Tevatron and the CERN Large Hadron Collider.
arXiv: High Energy Physics - Phenomenology | 2003
William B. Kilgore
We present universal factorization formulas describing the behavior of one-loop QCD amplitudes as external momenta become either soft or collinear. Our results are valid to all orders in the dimensional regularization parameter, {epsilon}. Terms through O({epsilon}{sup 2}) can contribute in infrared divergent phase space integrals associated with next-to-next-to-leading order jet cross sections. (c) 1999 The American Physical Society.
Physical Review D | 2004
William B. Kilgore
The production cross section for pseudo-scalar Higgs bosons at hadron colliders is computed at next-to-next-to-leading order (NNLO) in QCD. The pseudo-scalar Higgs is assumed to couple only to top quarks. The NNLO efiects are evaluated using an efiective lagrangian where the top quarks are integrated out. The NNLO corrections are similar in size to those found for scalar Higgs boson production.
Physical Review D | 2003
V. Del Duca; William B. Kilgore; C. Oleari; C. Schmidt; D. Zeppenfeld
Real emission corrections to gg ->H, which lead to H+2 jet events, are calculated at order alpha_s^4. Contributions include top-quark triangles, boxes and pentagon diagrams and are evaluated analytically for arbitrary top mass m_t. This new source of H+2 jet events is compared to the weak-boson fusion cross section for a range of Higgs boson masses. The heavy top-mass approximation appears to work well for intermediate Higgs-boson masses, provided that the transverse momenta of the final-state partons are smaller than the top-quark mass.
Physical Review D | 2014
William B. Kilgore
The contributions of virtual corrections and soft gluon emission to the inclusive Higgs production cross section pp -> H + X are computed at next-to-next-to-leading order in the heavy top quark limit. We show that this part of the total cross section is well behaved in the sense of perturbative convergence, with the NNLO corrections amounting to an enhancement of the NLO cross section by \sim 5% for LHC and 10-20% for the Tevatron. We compare our results with an existing estimate of the full NNLO effects and argue that an analytic evaluation of the hard scattering contributions is needed.