scholarly journals N-jettiness beam functions at N3LO

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Markus A. Ebert ◽  
Bernhard Mistlberger ◽  
Gherardo Vita
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Production Cross ◽  
Building Blocks ◽  
Leading Order ◽  
Collinear Limit ◽  
Complete Calculation ◽  
The One ◽  
Class Of Functions ◽  
Rational Kernels

Abstract We present the first complete calculation for the quark and gluon N-jettiness ($$ {\mathcal{T}}_N $$ T N ) beam functions at next-to-next-to-next-to-leading order (N3LO) in perturbative QCD. Our calculation is based on an expansion of the differential Higgs boson and Drell-Yan production cross sections about their collinear limit. This method allows us to employ cutting edge techniques for the computation of cross sections to extract the universal building blocks in question. The class of functions appearing in the matching coefficents for all channels includes iterated integrals with non-rational kernels, thus going beyond the one of harmonic polylogarithms. Our results are a key step in extending the $$ {\mathcal{T}}_N $$ T N subtraction methods to N3LO, and to resum $$ {\mathcal{T}}_N $$ T N distributions at N3LL′ accuracy both for quark as well as for gluon initiated processes.

scholarly journals Transverse momentum dependent PDFs at N3LO

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Markus A. Ebert ◽  
Bernhard Mistlberger ◽  
Gherardo Vita
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Production Cross ◽  
Gluon Fusion ◽  
Building Blocks ◽  
Distribution Functions ◽  
Leading Order ◽  
Parton Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Collinear Limit

Abstract We compute the quark and gluon transverse momentum dependent parton distribution functions at next-to-next-to-next-to-leading order (N3LO) in perturbative QCD. Our calculation is based on an expansion of the differential Drell-Yan and gluon fusion Higgs production cross sections about their collinear limit. This method allows us to employ cutting edge multiloop techniques for the computation of cross sections to extract these universal building blocks of the collinear limit of QCD. The corresponding perturbative matching kernels for all channels are expressed in terms of simple harmonic polylogarithms up to weight five. As a byproduct, we confirm a previous computation of the soft function for transverse momentum factorization at N3LO. Our results are the last missing ingredient to extend the qT subtraction methods to N3LO and to obtain resummed qT spectra at N3LL′ accuracy both for gluon as well as for quark initiated processes.

scholarly journals Collinear expansion for color singlet cross sections

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Markus A. Ebert ◽  
Bernhard Mistlberger ◽  
Gherardo Vita
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Gluon Fusion ◽  
Building Blocks ◽  
Color Singlet ◽  
Final State ◽  
Beam Function ◽  
Kinematic Limit ◽  
State Radiation

Abstract We demonstrate how to efficiently expand cross sections for color-singlet production at hadron colliders around the kinematic limit of all final state radiation being collinear to one of the incoming hadrons. This expansion is systematically improvable and applicable to a large class of physical observables. We demonstrate the viability of this technique by obtaining the first two terms in the collinear expansion of the rapidity distribution of the gluon fusion Higgs boson production cross section at next-to-next-to leading order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this technique is used to extract universal building blocks of scattering cross section like the N-jettiness and transverse momentum beam function at NNLO.

scholarly journals Charged current Drell-Yan production at N3LO

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Claude Duhr ◽  
Falko Dulat ◽  
Bernhard Mistlberger
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
Hadron Collider ◽  
Charge Asymmetry ◽  
Charged Current ◽  
Leading Order ◽  
Neutrino Pair ◽  
The Impact

Abstract We present the production cross section for a lepton-neutrino pair at the Large Hadron Collider computed at next-to-next-to-next-to-leading order (N3LO) in QCD perturbation theory. We compute the partonic coefficient functions of a virtual W± boson at this order. We then use these analytic functions to study the progression of the perturbative series in different observables. In particular, we investigate the impact of the newly obtained corrections on the inclusive production cross section of W± bosons, as well as on the ratios of the production cross sections for W+, W− and/or a virtual photon. Finally, we present N3LO predictions for the charge asymmetry at the LHC.

PRODUCTION OF CHARGED HIGGS BOSON ASSOCIATED WITH A W GAUGE BOSON AT THE LHC

2011 ◽  
Vol 26 (32) ◽  
pp. 2391-2402
Author(s):  
CHONG-XING YUE ◽  
XIAO-JIAO GUO ◽  
NA LI
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Gauge Boson ◽  
Production Cross Section ◽  
Production Cross ◽  
Charged Higgs Boson ◽  
Tree Level ◽  
Charged Higgs ◽  
Triplet Model ◽  
The One

Production of charged Higgs boson associated with a W gauge boson at the LHC is mainly induced by the tree-level [Formula: see text] annihilation and the one-loop gg fusion. In the context of the Higgs triplet model (HTM) and the left–right twin Higgs (LRTH) model, we calculate the production cross-section σ of the process pp→H±W∓ and compare our results with those given by supersymmetry (SUSY). We find that, in most of the parameter space of the HTM, the production cross-section σ is smaller than that predicted by the LRTH model or SUSY. The value of σ within the LRTH model is larger or smaller than the SUSY case, which depends on the relevant free parameters.

scholarly journals THE MESON PRODUCTION IN PROTON–PROTON COLLISIONS IN NEXT-TO-LEADING ORDER AND INFRARED RENORMALONS

2011 ◽  
Vol 20 (05) ◽  
pp. 1243-1270 ◽  
Author(s):  
A. I. AHMADOV ◽  
R. M. BURJALIYEV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Meson Production ◽  
Leading Order ◽  
Proton Proton ◽  
Proton Collisions ◽  
Running Coupling ◽  
Coupling Approach ◽  
Proton Proton Collisions

In this paper, we investigate the next-to-leading order contribution of the higher-twist Feynman diagrams to the large-pT inclusive pion production cross-section in proton–proton collisions and present the general formulae for the higher-twist differential cross-sections in the case of the running coupling and frozen coupling approaches. We compared the resummed next-to-leading order higher-twist cross-sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross-section. The structure of infrared renormalon singularities of the higher-twist subprocess cross-section and its resummed expression (the Borel sum) are found. It is shown that the resummed result depends on the choice of the meson wave functions used in the calculations. We discuss the phenomenological consequences of possible higher-twist contributions to the meson production in proton–proton collisions in next-to-leading order at RHIC.

scholarly journals Erratum to: Measurement of jet production cross sections in deep-inelastic ep scattering at HERA

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
V. Andreev ◽  
A. Baghdasaryan ◽  
K. Begzsuren ◽  
A. Belousov ◽  
A. Bolz ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
The Other ◽  
Leading Order ◽  
Jet Production ◽  
Jet Cross Sections

AbstractThe measurement of the jet cross sections by the H1 collaboration had been compared to various predictions including the next-to-next-to-leading order (NNLO) QCD calculations which are corrected in this erratum for an implementation error in one of the components of the NNLO calculations. The jet data and the other predictions remain unchanged. Eight figures, one table and conclusions are adapted accordingly, exhibiting even better agreement between the corrected NNLO predictions and the jet data.

scholarly journals Single Top and Higgs Associated Production in the MinimalB-LModel at the LHC

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Bingfang Yang ◽  
Zhiyong Liu ◽  
Jinzhong Han ◽  
Guang Yang
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Cross Sections ◽  
Production Cross ◽  
High Luminosity ◽  
Associated Production ◽  
Single Top ◽  
The Standard Model

We study the single top production in association with a Higgs boson in theU(1)B-Lextension of the Standard Model at the LHC. We calculate the production cross sections of the processespp→thX  (h=H1,H2;  X=j,b,W)in this model. We further study the observability of the processpp→tH2jthroughpp→t(→qq-′b)H2(→4l)jand find that it is still challenging for the 14 TeV LHC with high luminosity to detect this signal.

scholarly journals Associated Charmonium-Bottomonium Production in a Single Boson e+e− Annihilation

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1262
Author(s):  
Ilia Belov ◽  
Alexander Berezhnoy ◽  
Evgeny Leshchenko
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Color Singlet ◽  
Production Processes ◽  
Wide Range ◽  
Main Color ◽  
The One

The production cross sections of J/ψηb, Yηc pairs in a single boson e+e− annihilation have been studied in a wide range of energies, which will be achieved at future e+e− colliders. The main color singlet contributions to the production processes are taken into account, including the one loop QCD contribution.

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