1,721,099 research outputs found
Higgs boson production at the LHC: Transverse-momentum resummation and rapidity dependence
No full text
Soft-gluon resummation for Higgs differential distributions at the large hadron collider
No full textWe study the transverse-momentum and rapidity distributions of the Standard Model Higgs boson in perturbative QCD, including die most advanced theoretical information presently available: fixed-order perturbation theory at Next-to-Leading Order (NLO) and soft-gluon resummation at the Next-to-Next-to-Leading Logarithmic accuracy (NNLL). Numerical results show sizeable contributions from resummation and an overall improvement of the stability with respect to scale variation and to the inclusion of higher perturbative orders
Selected items in jet algorithms
No full textI provide a very brief overview of recent developments in jet algorithms, mostly focusing on the issue of infrared-safety
Nonperturbative Uncertainties on the Transverse Momentum Distribution of Electroweak Bosons and on the Determination of the W Boson Mass at the LHC
Full text linkIn this contribution we present an overview of recent results concerning the impact of a possible flavour dependence of the intrinsic quark transverse momentum on electroweak observables. In particular, we focus on the spectrum of electroweak gauge bosons produced in proton-proton collisions at the LHC and on the direct determination of the boson mass. We show that these effects are comparable in size to other nonperturbative effects commonly included in phenomenological analyses and should thus be included in precise theoretical predictions for present and future hadron colliders
Perturbative RGE systematics in precision observables
Full text linkQCD calculations for collider physics make use of perturbative solutions of renormalization group equations. Ambiguities related to these solutions can contribute significantly to systematic uncertainties of theoretical predictions for physical observables. We propose a general method to estimate these systematic effects using techniques inspired by soft-gluon and transverse-momentum resummation approaches. We first discuss the cases of the evolution of strong coupling αs, collinear parton-distribution functions, and transverse-momentum-dependent distributions. We then study the implications for precision observables in hadron-collider processes, such as the deep-inelastic scattering structure functions and the transverse-momentum distribution of the lepton pair in Drell-Yan production
Structure functions and perturbative hysteresis
Full text linkWe discuss hysteresis effects in the perturbative solution of
renormalization group equations for the strong coupling and parton
distribution functions, and study their impact on precision determinations of proton's deep-inelastic structure functions F2 and FL
Patologia traumatica da incidente stradale: indagine epidemiologica su soggetti afferiti al pronto soccorso generale dell'ospedale di Pisa
No full textHiggs at LHC
No full textAn overview of recent theoretical results on the Higgs boson and its discovery strategy at ATLAS and CMS will be presented, focussing on the main Higgs analysis effective with low integrated luminosity (< 30 fb(-1))
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