scholarly journals Transverse-momentum resummation for boson plus jet production at hadron colliders

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Luca Buonocore ◽  
Massimiliano Grazzini ◽  
Jürg Haag ◽  
Luca Rottoli
Keyword(s):  
Higgs Boson ◽  
Transverse Momentum ◽  
Perturbative Expansion ◽  
Leading Order ◽  
Hadron Colliders ◽  
Azimuthal Correlations ◽  
Associated Production ◽  
Hadronic Collisions ◽  
Logarithmic Accuracy ◽  
Exact Dependence

AbstractWe consider the associated production of a vector or Higgs boson with a jet in hadronic collisions. When the transverse momentum $$q_T$$ q T of the boson-jet system is much smaller than its invariant mass Q, the QCD perturbative expansion is affected by large logarithmic terms that must be resummed to all orders. We discuss the all-order resummation structure of the logarithmically enhanced contributions up to next-to-leading logarithmic accuracy. Resummation is performed at the differential level with respect to the kinematical variables of the boson-jet system. Soft-parton radiation produces azimuthal correlations that are fully accounted for in our framework. We present explicit analytical results for the resummation coefficients up to next-to-leading order and next-to-leading logarithmic accuracy, that include the exact dependence on the jet radius.

scholarly journals $${t {{\bar{t}}}H}$$ production at NNLO: the flavour off-diagonal channels

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Stefano Catani ◽  
Ignacio Fabre ◽  
Massimiliano Grazzini ◽  
Stefan Kallweit
Keyword(s):  
Transverse Momentum ◽  
Perturbative Expansion ◽  
Complete Agreement ◽  
Leading Order ◽  
Hadron Colliders ◽  
Fully Differential ◽  
Associated Production ◽  
Fixed Order ◽  
Heavy Quark Pair ◽  
First Time

AbstractWe consider QCD radiative corrections to the associated production of a heavy-quark pair ($$Q{{\bar{Q}}}$$ Q Q ¯ ) with a generic colourless system F at hadron colliders. We discuss the resummation formalism for the production of the $$Q{{\bar{Q}}}F$$ Q Q ¯ F system at small values of its total transverse momentum $$q_T$$ q T . We present the results of the corresponding resummation coefficients at next-to-leading and, partly, next-to-next-to-leading order. The perturbative expansion of the resummation formula leads to the explicit ingredients that can be used to apply the $$q_T$$ q T subtraction formalism to fixed-order calculations for this class of processes. We use the $$q_T$$ q T subtraction formalism to perform a fully differential perturbative computation for the production of a top-antitop quark pair and a Higgs boson. At next-to-leading order we compare our results with those obtained with established subtraction methods and we find complete agreement. We present, for the first time, the results for the flavour off-diagonal partonic channels at the next-to-next-to-leading order.

scholarly journals Transverse momentum resummation for Higgs boson produced viabbar b fusion at hadron colliders

2006 ◽  
Vol 2006 (04) ◽  
pp. 004-004 ◽  
Author(s):  
Alexander Belyaev ◽  
Pavel M Nadolsky ◽  
Chien-Peng Yuan
Keyword(s):  
Higgs Boson ◽  
Transverse Momentum ◽  
Hadron Colliders

scholarly journals Three-loop soft function for energetic electroweak boson production at hadron colliders

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Ze Long Liu ◽  
Maximilian Stahlhofen
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Hadron Collider ◽  
Boson Production ◽  
Leading Order ◽  
Large Transverse Momentum ◽  
Hadron Colliders ◽  
Soft Function ◽  
Electroweak Boson ◽  
First Time

Abstract We calculate the three-loop soft function for the production of an electroweak boson (Higgs, γ, W±, Z) with large transverse momentum at a hadron collider. It is the first time a soft function for a three-parton process is computed at next-to-next-to-next-to-leading order (N3LO). As a technical novelty, we perform the calculation in terms of forward-scattering-type loop diagrams rather than evaluating phase space integrals. Our three-loop result contains color-tripole contributions and explicitly confirms predictions on the universal infrared structure of QCD scattering amplitudes with three massless parton legs. The soft function is a central ingredient in the factorized cross section for electroweak boson production near the kinematic endpoint (threshold), where the invariant mass of the recoiling hadronic radiation is small compared to its transverse momentum. Our result is required for predictions of the near-threshold cross sections at N3LO and for the resummation of threshold logarithms at primed next-to-next-to-next-to-leading logarithmic (N3LL′) accuracy.

scholarly journals Associated production of the Higgs boson and a single top quark at hadron colliders

2001 ◽  
Vol 64 (9) ◽  
Author(s):  
F. Maltoni ◽  
K. Paul ◽  
T. Stelzer ◽  
S. Willenbrock
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Hadron Colliders ◽  
Associated Production ◽  
Single Top

scholarly journals Azimuthal correlations of high transverse momentum jets at next-to-leading order in the parton branching method

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
M. I. Abdulhamid ◽  
M. A. Al-Mashad ◽  
A. Bermudez Martinez ◽  
G. Bonomelli ◽  
I. Bubanja ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Parton Shower ◽  
Good Description ◽  
Leading Order ◽  
High Transverse Momentum ◽  
Azimuthal Correlation ◽  
Azimuthal Correlations ◽  
The Matrix ◽  
Good Agreement

AbstractThe azimuthal correlation, $$\Delta \phi _{12}$$ Δ ϕ 12 , of high transverse momentum jets in pp collisions at $$\sqrt{s}=13$$ s = 13  TeV is studied by applying PB-TMD distributions to NLO calculations via MCatNLO together with the PB-TMD parton shower. A very good description of the cross section as a function of $$\Delta \phi _{12}$$ Δ ϕ 12 is observed. In the back-to-back region of $${\Delta \phi _{12}}\rightarrow \pi $$ Δ ϕ 12 → π , a very good agreement is observed with the PB-TMD Set 2 distributions while significant deviations are obtained with the PB-TMD Set 1 distributions. Set 1 uses the evolution scale while Set 2 uses transverse momentum as an argument in $$\alpha _\mathrm {s}$$ α s , and the above observation therefore confirms the importance of an appropriate soft-gluon coupling in angular ordered parton evolution. The total uncertainties of the predictions are dominated by the scale uncertainties of the matrix element, while the uncertainties coming from the PB-TMDs and the corresponding PB-TMD shower are very small. The $$\Delta \phi _{12}$$ Δ ϕ 12 measurements are also compared with predictions using MCatNLO together Pythia8, illustrating the importance of details of the parton shower evolution.

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