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Title:

EW corrections to Higgs strahlung at the Tevatron and the LHC with HAWK

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We briefly report on the inclusion of NLO QCD and electroweak corrections to the Higgsstrahlung processes pp/p¯p → HW/Z→H+2leptons in the Monte Carlo program HAWK †. The electroweak corrections, which are at the level of −(5−10) % for total cross sections, further increase in size with increasing transverse momenta (pT) in differential cross sec...

We briefly report on the inclusion of NLO QCD and electroweak corrections to the Higgsstrahlung processes pp/p¯p → HW/Z→H+2leptons in the Monte Carlo program HAWK †. The electroweak corrections, which are at the level of −(5−10) % for total cross sections, further increase in size with increasing transverse momenta (pT) in differential cross sections. For instance, for pT,H> ∼ 200GeV, which is the interesting range at the LHC, the electroweak corrections to WH production reach about−15 % for MH = 120GeV. PoS(EPS-HEP2011)235 Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-05-07

Source:

http://pos.sissa.it/archive/conferences/134/235/EPS-HEP2011_235.pdf

http://pos.sissa.it/archive/conferences/134/235/EPS-HEP2011_235.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Precision Calculations for Gauge-Boson Pair Production with a Hadronic Jet at Hadron Colliders

Description:

Gauge-boson pair-production processes with an additional hadronic jet are of particular interest as background to Higgs and new-physics searches at hadron colliders. Moreover, they enable---besides genuine gauge-boson pair production---a direct analysis of the non-Abelian gauge-boson self-interactions in the electroweak sector. In this work we p...

Gauge-boson pair-production processes with an additional hadronic jet are of particular interest as background to Higgs and new-physics searches at hadron colliders. Moreover, they enable---besides genuine gauge-boson pair production---a direct analysis of the non-Abelian gauge-boson self-interactions in the electroweak sector. In this work we provide precision calculations for the processes pp->VV+jet+X. In detail, corrections to WW+jet, ZZ+jet, and WZ+jet production are evaluated at next-to-leading-order in the strong coupling (NLO QCD). Particular care has to be taken when treating the infrared singularities arising in the virtual and real corrections. The FormCalc/LoopTools package is applied for the virtual corrections, where dimensionally regularized infrared-divergent integrals are added to the FF library which is used for the regular ones. The real-emission matrix elements are evaluated in terms of helicity amplitudes in the Weyl--van-der-Waerden formalism. The Catani--Seymour dipole subtraction formalism mediates the cancellation of infrared divergences between the two contributions. To perform the numerical integration a multi-channel Monte Carlo integrator is written in C++, which is designed to meet the requirements of integrating cross sections in the dipole subtraction formalism. For all gauge-boson assignments, the NLO QCD corrections significantly stabilize the artificial dependence of the leading-order (LO) cross sections on renormalization and factorization scales for Tevatron. For LHC, however, only a modest reduction of the scale dependence results unless a veto on a second hard jet is applied. Beyond investigating the production processes, leptonic decays of the gauge bosons are considered. To this end, a full amplitude calculation including resonant and non-resonant contributions to the leptonic final states, a simple narrow-width approximation (NWA), and an improved version of the NWA that takes into account spin correlations are performed at LO. Comparing these approaches the improved NWA turns out to deliver an appropriate approximation to the decays at a reasonable level of accuracy. Thus, an NLO QCD calculation to VV+jet including leptonic decays is performed in the framework of the improved NWA. Several results on differential cross sections for quantities of the jet and the decay leptons are presented. For WW+jet, we discuss both proton--proton collisions at LHC and proton--antiproton collisions at Tevatron. For WZ+jet and ZZ+jet, however, the cross sections at Tevatron are too small, so only results for LHC are presented. The Monte Carlo generator developed in this thesis can be used as a tool in data analysis at LHC and Tevatron. Minimize

Publisher:

Ludwig-Maximilians-Universität München

Year of Publication:

2008-11-21

Document Type:

Dissertation ; NonPeerReviewed

Subjects:

Fakultät für Physik

Fakultät für Physik Minimize

DDC:

530 Physics *(computed)*

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http://edoc.ub.uni-muenchen.de/9362/

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Title:

NLO QCD corrections to pp->WW+jet+X

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We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches. If a veto against the emission of a second hard jet is applied, the corrections stabilize the leading-order...

We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches. If a veto against the emission of a second hard jet is applied, the corrections stabilize the leading-order prediction for the cross section considerably. ; Comment: 6 pages, latex, 4 ps figures, to appear in the proceedings of the "8th International Symposium on Radiative Corrections (RADCOR07)", Florence, Italy, October 1-5, 2007 Minimize

Year of Publication:

2007-12-19

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

NLO QCD corrections to WW+jet production including leptonic W decays at hadron colliders

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Description:

We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at the Tevatron and the LHC, which is an important source of background for Higgs and new-physics searches. Leptonic decays of the W bosons are included by applying an improved version of the narrow-width ap...

We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at the Tevatron and the LHC, which is an important source of background for Higgs and new-physics searches. Leptonic decays of the W bosons are included by applying an improved version of the narrow-width approximation that treats the W bosons as on-shell particles, but keeps the information on the W spin. A selection of differential NLO QCD cross sections is provided both for the LHC and the Tevatron. The QCD corrections stabilize the LO prediction for the cross section with respect to scale variations. The differential LO cross sections are generally not simply rescaled by the corrections. Their shapes are particularly distorted if an additional energy scale is involved. ; Comment: 6pp. To appear in the proceedings of 9th International Symposium on Radiative Corrections (RADCOR 2009): Applications of Quantum Field Theory to Phenomenology, Ascona, Switzerland, 25-30 Oct 2009 Minimize

Year of Publication:

2010-01-14

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

DDC:

530 Physics *(computed)*

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Title:

NLO QCD corrections to pp->WW+jet+X

Author:

Description:

We report on a calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches at the LHC. If a veto against the emission of a second hard jet is applied, the corrections stabilize the lead...

We report on a calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches at the LHC. If a veto against the emission of a second hard jet is applied, the corrections stabilize the leading-order prediction for the cross section considerably. ; Comment: 6 pages, latex, 5 figures, 7 eps-files, to appear in the proceedings of 9th Workshop on Elementary Particle Theory: Loops and Legs in Quantum Field Theory, Sondershausen, Germany, 20-25 Apr 2008 Minimize

Year of Publication:

2008-07-04

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

NLO QCD corrections to W+ W+ jj production in vector-boson fusion at the LHC

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We present a next-to-leading-order QCD calculation for e+\nu e\mu+\nu\mu jj production in vector-boson fusion, i.e. the scattering of two positively charged W bosons at the LHC. We include the complete set of electroweak leading-order diagrams for the six-particle final state and quantitatively assess the size of the s-channel and interference c...

We present a next-to-leading-order QCD calculation for e+\nu e\mu+\nu\mu jj production in vector-boson fusion, i.e. the scattering of two positively charged W bosons at the LHC. We include the complete set of electroweak leading-order diagrams for the six-particle final state and quantitatively assess the size of the s-channel and interference contributions in VBF kinematics. The calculation uses the complex-mass scheme to describe the W-boson resonances and is implemented into a flexible Monte Carlo generator. Using a dynamical scale based on the transverse momenta of the jets, the QCD corrections stay below about 10% for all considered observables, while the residual scale dependence is at the level of 1%. ; Comment: 60 pages Minimize

Year of Publication:

2012-09-11

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

EW corrections to Higgs strahlung at the Tevatron and the LHC with HAWK

Author:

Description:

We briefly report on the inclusion of NLO QCD and electroweak corrections to the Higgs-strahlung processes pp/ppbar -> HW/Z -> H+2leptons in the Monte Carlo program HAWK. The electroweak corrections, which are at the level of -(5-10)% for total cross sections, further increase in size with increasing transverse momenta (p_T) in differential cros...

We briefly report on the inclusion of NLO QCD and electroweak corrections to the Higgs-strahlung processes pp/ppbar -> HW/Z -> H+2leptons in the Monte Carlo program HAWK. The electroweak corrections, which are at the level of -(5-10)% for total cross sections, further increase in size with increasing transverse momenta (p_T) in differential cross sections. For instance, for p_{T,H}>200GeV, which is the interesting range at the LHC, the electroweak corrections to WH production reach about -15% for M_H=120GeV. ; Comment: 4 pages, latex, 2 figures (8 plots), to appear in the proceedings of The 2011 Europhysics Conference on High Energy Physics, EPS-HEP 2011, Grenoble, France Minimize

Year of Publication:

2011-12-22

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

NLO QCD corrections to off-shell ttbar production at hadron colliders

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The production of top-antitop-quark pairs at hadron colliders is interesting both in its own right as signal process, but also as background to many searches for new physics. The corresponding predictions aim at the precision level of few per cent, rendering not only the inclusion of radiative corrections of the strong and electroweak interactio...

The production of top-antitop-quark pairs at hadron colliders is interesting both in its own right as signal process, but also as background to many searches for new physics. The corresponding predictions aim at the precision level of few per cent, rendering not only the inclusion of radiative corrections of the strong and electroweak interactions relevant, but also of off-shell and finite-width effects originating from the top-quark decays t -> b W -> b l \nu_l / qq'. We report on a calculation for the full process pp -> W^+ W^- b \bar{b} -> \nu_e e^+ \mu^- \nu_\mu b \bar{b} at next-to-leading order QCD and discuss the effects of the finite widths of the top quarks and of the W bosons for selected observables. Generically it turns out that finite-top-width effects are at the per-cent level whenever the top-quark resonances dominate, but those effects can reach tens of per cent in off-shell tails. Finite-W-width effects, on the other hand, are suppressed to less than 0.5% whenever the top quarks can become resonant and only become sizeable in exceptional cases. One such case, however, is the invariant mass of a bottom quark and the corresponding charged lepton, which result from the same top-quark decay - an observable that is relevant for precision measurements of the top-quark mass. ; Comment: 7 pages, 4 eps figures, to appear in the Proceedings of the 11th Workshop "Loops and Legs in Quantum Field Theory", Wernigerode, Germany, 2012 Minimize

Year of Publication:

2012-08-20

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

DDC:

530 Physics *(computed)*

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Title:

NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders

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We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for \nu e e+ \mu- \bar{\nu}_{\mu}b\bar{b} production and includes all non-resonant diagrams, inte...

We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for \nu e e+ \mu- \bar{\nu}_{\mu}b\bar{b} production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. However, they can be strongly enhanced in exclusive observables that play an important role in Higgs and new-physics searches. Also non-resonant and off-shell effects due to the finite W-boson width are investigated in detail, but their impact is much smaller than naively expected. We also introduce a matching approach to improve NLO calculations involving intermediate unstable particles. Using a fixed QCD scale leads to perturbative instabilities in the high-energy tails of distributions, but an appropriate dynamical scale stabilises NLO predictions. Numerical results for the total cross section, several distributions, and asymmetries are presented for Tevatron and the LHC at 7 TeV, 8 TeV, and 14 TeV. ; Comment: 61 pp. Matches version published in JHEP; one more reference added Minimize

Year of Publication:

2012-07-20

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

DDC:

530 Physics *(computed)*

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Title:

HAWK 2.0: A Monte Carlo program for Higgs production in vector-boson fusion and Higgs strahlung at hadron colliders

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The Monte Carlo integrator HAWK provides precision predictions for Higgs production at hadron colliders in vector-boson fusion and Higgs strahlung, i.e. in production processes where the Higgs boson is Attached to WeaK bosons. The fully differential predictions include the full QCD and electroweak next-to-leading-order corrections. Results are c...

The Monte Carlo integrator HAWK provides precision predictions for Higgs production at hadron colliders in vector-boson fusion and Higgs strahlung, i.e. in production processes where the Higgs boson is Attached to WeaK bosons. The fully differential predictions include the full QCD and electroweak next-to-leading-order corrections. Results are computed as integrated cross sections and as binned distributions for important hadron-collider observables. ; Comment: 33 pages, 1 figure Minimize

Year of Publication:

2014-12-17

Document Type:

text

Subjects:

High Energy Physics - Phenomenology ; High Energy Physics - Experiment

High Energy Physics - Phenomenology ; High Energy Physics - Experiment Minimize

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