A number of phenomenologically relevant processes at hadron colliders, such as Higgs and Z boson production in association with b quarks, can be conveniently described as scattering of heavy quarks in the initial state. We present a detailed analysis of this class of processes, identifying the form of the leading initial-state collinear logarithms that allow the relation of calculations performed in different flavour schemes in a simple and reliable way. This procedure makes it possible to assess the size of the logarithmically enhanced terms and the effects of their resummation via heavy-quark parton distribution functions. As an application, we compare the production of (SM-like and heavy) scalar and vector bosons in association with b quarks at the LHC in the four- and five-flavour schemes as well as the production of a heavy Z' in association with top quarks at a future 100 TeV hadron collider in the five- and six-flavour schemes. We find that, in agreement with a previous analysis of single heavy-quark initiated processes, the size of the initial-state logarithms is mitigated by a kinematical suppression. The most important effects of the resummation are a shift of the central predictions typically of about 20% at a justified value of the scale of each considered process and a significant reduction of scale variation uncertainties.
Maltoni Fabio, Ridolfi Giovanni, Ubiali Maria, b-initiated processes at the LHC: a reappraisal, 10.1007/jhep07(2012)022
Dawson S., Jackson C. B., Reina L., Wackeroth D., Exclusive Higgs boson production with bottom quarks at hadron colliders, 10.1103/physrevd.69.074027
Maltoni F., Sullivan Z., Willenbrock S., Higgs-boson production via bottom-quark fusion, 10.1103/physrevd.67.093005
J.M. Campbell et al., Higgs boson production in association with bottom quarks, hep-ph/0405302 [ INSPIRE ].
R. Harlander, M. Krämer and M. Schumacher, Bottom-quark associated Higgs-boson production: reconciling the four- and five-flavour scheme approach, arXiv:1112.3478 [ INSPIRE ].
Wiesemann M., Frederix R., Frixione S., Hirschi V., Maltoni F., Torrielli P., Higgs production in association with bottom quarks, 10.1007/jhep02(2015)132
F. Febres Cordero, L. Reina and D. Wackeroth, NLO QCD corrections to Z b b ¯ $$ Zb\overline{b} $$ production with massive bottom quarks at the Fermilab Tevatron, Phys. Rev. D 78 (2008) 074014 [ arXiv:0806.0808 ] [ INSPIRE ].
F. Febres Cordero, L. Reina and D. Wackeroth, W- and Z-boson production with a massive bottom-quark pair at the Large Hadron Collider, Phys. Rev. D 80 (2009) 034015 [ arXiv:0906.1923 ] [ INSPIRE ].
Frederix Rikkert, Frixione Stefano, Hirschi Valentin, Maltoni Fabio, Pittau Roberto, Torrielli Paolo, W and Z/γ ∗ boson production in association with a bottom-antibottom pair, 10.1007/jhep09(2011)061
Bonvini Marco, Papanastasiou Andrew S., Tackmann Frank J., Resummation and matching of b-quark mass effects in b b ¯ H $$ b\overline{b}H $$ production, 10.1007/jhep11(2015)196
Forte Stefano, Napoletano Davide, Ubiali Maria, Higgs production in bottom-quark fusion in a matched scheme, 10.1016/j.physletb.2015.10.051
M. Bonvini, A.S. Papanastasiou and F.J. Tackmann, Matched predictions for the b b ¯ H $$ b\overline{b}H $$ cross section at the 13 TeV LHC, arXiv:1605.01733 [ INSPIRE ].
S. Forte, D. Napoletano and M. Ubiali, Higgs production in bottom-quark fusion: matching beyond leading order, arXiv:1607.00389 [ INSPIRE ].
R.K. Ellis, W.J. Stirling and B.R. Webber, QCD and Collider Physics, Cambridge University Press (1996).
F. Maltoni, T. McElmurry, R. Putman and S. Willenbrock, Choosing the Factorization Scale in Perturbative QCD, hep-ph/0703156 [ INSPIRE ].
NNPDF collaboration, R.D. Ball et al., Parton distributions for the LHC Run II, JHEP 04 (2015) 040 [ arXiv:1410.8849 ] [ INSPIRE ].
S. Dawson, A. Ismail and I. Low, Redux on “When is the top quark a parton?”, Phys. Rev. D 90 (2014) 014005 [ arXiv:1405.6211 ] [ INSPIRE ].
Harlander Robert V., Kilgore William B., Higgs boson production in bottom quark fusion at next-to-next-to-leading order, 10.1103/physrevd.68.013001
Dittmaier Stefan, Krämer Michael, Spira Michael, Higgs radiation off bottom quarks at the Fermilab Tevatron and the CERN LHC, 10.1103/physrevd.70.074010
DAWSON S., JACKSON C. B., REINA L., WACKEROTH D., HIGGS PRODUCTION IN ASSOCIATION WITH BOTTOM QUARKS AT HADRON COLLIDERS, 10.1142/s0217732306019256
Alwall J., Frederix R., Frixione S., Hirschi V., Maltoni F., Mattelaer O., Shao H.-S., Stelzer T., Torrielli P., Zaro M., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations, 10.1007/jhep07(2014)079
B. Jager, L. Reina and D. Wackeroth, Higgs boson production in association with b jets in the POWHEG BOX, Phys. Rev. D 93 (2016) 014030 [ arXiv:1509.05843 ] [ INSPIRE ].
Gleisberg T, Höche S, Krauss F, Schönherr M, Schumann S, Siegert F, Winter J, Event generation with SHERPA 1.1, 10.1088/1126-6708/2009/02/007
Harlander Robert V., Liebler Stefan, Mantler Hendrik, SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM, 10.1016/j.cpc.2013.02.006
Maltoni Fabio, McElmurry Thomas, Willenbrock Scott, Inclusive production of a Higgs orZboson in association with heavy quarks, 10.1103/physrevd.72.074024
Han Tao, Sayre Josh, Westhoff Susanne, Top-quark initiated processes at high-energy hadron colliders, 10.1007/jhep04(2015)145
Keller Stéphane, Laenen Eric, Next-to-leading order cross sections for tagged reactions, 10.1103/physrevd.59.114004
Catani Stefano, Dittmaier Stefan, Trócsányi Zoltán, One-loop singular behaviour of QCD and SUSY QCD amplitudes with massive partons, 10.1016/s0370-2693(01)00065-x
E. Byckling and K. Kajantie, Particle Kinematics, University of Jyvaskyla, Jyvaskyla, Finland (1971).
Référence bibliographique
Maltoni, Fabio ; et. al. Anatomy of double heavy-quark initiated processes. In: Journal of High Energy Physics, Vol. 1609, p. 132 (2016)