Article
Physics, Particles & Fields
Emanuele Re, Luca Rottoli, Paolo Torrielli
Summary: This study presents state-of-the-art predictions for transverse observables relevant to colour-singlet production at the LHC, utilizing a NLL-L-3 resummation according to the RADISH formalism and matching the results with fixed-order differential spectra at NNLO accuracy. The inclusion of O(α(3)(s)) constant terms and transverse-recoil effects proves beneficial for comparing theoretical predictions to data, leaving a residual theoretical uncertainty in the resummation region at the 2-5% level for Drell-Yan observables, and 5-7% in Higgs production.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Rene Poncelet, Andrei Popescu
Summary: The longitudinal polarization of weak bosons, a direct consequence of Electroweak symmetry breaking mechanism, was studied at NNLO in diboson production with a fiducial setup inspired by ATLAS measurements. The study, utilizing the double-pole approximation framework, investigates NNLO effects in differential distributions for the first time.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mathieu Pellen, Rene Poncelet, Andrei Popescu
Summary: This study investigates the polarisation of W-bosons produced in association with one jet at the LHC. The necessary theoretical elements for accurately extracting polarisation fractions are provided. New polarised predictions up to NNLO QCD accuracy using the narrow-width approximation are presented in inclusive and fiducial phase spaces. Results in the fiducial phase space are compared to a full off-shell computation and experimental data. Finally, the polarisation fractions are fitted using shape templates, demonstrating that NNLO corrections significantly improve their determination.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Tobias Neumann, John Campbell
Summary: Drell-Yan production is a precision cornerstone for the LHC, providing calibration for measurements like the W-boson mass. This study presents the first independent calculation of Drell-Yan production at order alpha 3s in transverse-momentum resummation improved perturbation theory. The calculation includes the recently published four loop rapidity anomalous dimension and three loop massive axial-vector contributions, and shows excellent agreement with the most recent data from CMS.
Article
Astronomy & Astrophysics
R. Gauld, A. Gehrmann-De Ridder, T. Gehrmann, E. W. N. Glover, A. Huss, I. Majer, A. Rodriguez Garcia
Summary: The production of lepton pairs at low invariant mass and finite transverse momentum provides insights into QCD dynamics at the boundary between perturbative and non-perturbative regimes. The impact of NNLO QCD corrections on observables at BNL RHIC collider and fixed-target experiments is investigated, showing satisfactory perturbative convergence. Collider data is well-described by perturbative QCD, highlighting the significance of non-perturbative effects at fixed target energies in lepton-pair transverse momentum distributions.
Article
Physics, Particles & Fields
Herschel A. Chawdhry, Michal Czakon, Alexander Mitov, Rene Poncelet
Summary: The study calculates the NNLO QCD corrections for diphoton production with an additional jet at the LHC, improving the accuracy of predicting the transverse momentum distribution of the diphoton system. The results are expected to enhance understanding of the Higgs boson sector and the behavior of higher-order corrections in LHC processes.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Michal Czakon, Alexander Mitov, Mathieu Pellen, Rene Poncelet
Summary: This study focuses on the production of a W boson in association with a c-jet at the LHC, calculating the complete set of NNLO QCD corrections for the dominant CKM-diagonal contribution to this process for the first time. Predictions are made for fiducial cross sections and differential distributions for both signatures, which are compared with ATLAS measurements at 7 TeV. The results are important for precise description of heavy flavor production at hadron colliders and determination of the strange-quark content of the proton from LHC data in NNLO QCD.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yaroslav Balytskyi, Jianbo Gao
Summary: The study presents a computation of the global soft function for single inclusive hadronic jet production at next-to-next-to-leading order, involving four lightlike Wilson lines and falling under SCET1 observables. The soft function is not sensitive to rapidity divergences and follows the non-Abelian exponentiation theorem. The research extends previous results by providing calculations for all 2 -> 2 processes involving four collinear light-cone directions, with threshold resummation performed at next-to-next-to-leading logarithmic accuracy and corresponding numerical results presented.
Article
Physics, Particles & Fields
Enrico Bothmann, Davide Napoletano, Marek Schonherr, Steffen Schumann, Simon Luca Villani
Summary: This paper studies the production of a pair of Z bosons at the LHC and includes EW corrections in theoretical predictions. By matching the exact NLO EW result with the resummed Sudakov logarithms, an improved NLO EW+ NLL EWsudexp result is obtained. The inclusion of the above EW corrections in MePs@Nlo event simulations is also discussed in the framework of the Sherpa event generator. Detailed phenomenological predictions for inclusive ZZ and ZZj production are presented, taking into account the dominant EW corrections through the EW virtual approximation and the (exponentiated) EW Sudakov logarithms.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
X. Chen, T. Gehrmann, E. W. N. Glover, A. Huss
Summary: This study investigates the impact of higher-order QCD corrections on the three-body decay of a Higgs boson. The corrections were found to have significant effects on the kinematic variables of the Higgs boson, but display distinctive features in the kinematics of its decay products.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
D. Britzger, A. Gehrmann-De Ridder, T. Gehrmann, E. W. N. Glover, C. Gwenlan, A. Huss, J. Pires, K. Rabbertz, D. Savoiu, M. R. Sutton, J. Stark
Summary: Fast interpolation-grid frameworks are efficient and flexible tools for evaluating higher-order predictions and extracting parton distribution functions and Standard Model parameters. The APPLFAST project provides a generic interface for grid interpolation and has been applied to jet production at the LHC.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Thomas Becher, Tobias Neumann
Summary: Our framework provides a q(T) resummation method for arbitrary color-singlet processes at (NLL)-L-3+NNLO accuracy based on a factorization theorem in SCET. The implementation CuTe-MCFM is fully differential and matches large-q(T) fixed-order predictions at relative order alpha s2, allowing for efficient estimation of uncertainties. In addition to various production processes, the framework is also applicable to diboson processes with decays, showing novel results for gamma gamma and Z gamma at (NLL)-L-3+NNLO accuracy.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Stefano Catani, Ignacio Fabre, Massimiliano Grazzini, Stefan Kallweit
Summary: In this study, we investigate the QCD radiative corrections for the associated production of a heavy-quark pair with a generic colorless system at hadron colliders. The resummation formalism for the production of the heavy-quark pair system at small values of its total transverse momentum is discussed, and the results of the corresponding resummation coefficients at next-to-leading and next-to-next-to-leading order are presented. The perturbative expansion of the resummation formula provides explicit ingredients for applying the q(T) subtraction formalism to fixed-order calculations, and a fully differential perturbative computation is performed for top-antitop quark pair and Higgs boson production, showing agreement with established subtraction methods. Also, results for the flavor off-diagonal partonic channels at the next-to-next-to-leading order are presented for the first time.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
X. Chen, T. Gehrmann, E. W. N. Glover, A. Huss, J. Mo
Summary: This study presents calculations using the antenna subtraction method in the NNLOJET framework for NNLO QCD corrections at full colour for several jet observables at the LHC. The impact of subleading colour contributions to the leading colour approximation is assessed for various observables and jet cone sizes, showing a potentially sizable role in the description of triply differential distributions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Xuan Chen, Thomas Gehrmann, Nigel Glover, Alexander Huss, Pier Francesco Monni, Emanuele Re, Luca Rottoli, Paolo Torrielli
Summary: This study presents a state-of-the-art calculation for the Drell-Yan process at hadron colliders, providing accurate theoretical predictions and experimental results. The research indicates that residual theory uncertainties can be significantly reduced and predictions can be improved by adjusting experimental cuts.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Stefan Kallweit, Vasily Sotnikov, Marius Wiesemann
Summary: In this study, NNLO QCD corrections to the production of three isolated photons in hadronic collisions are presented at the fully differential level. The importance of NNLO corrections for describing ATLAS 8TeV data and future precision studies of triphoton production at higher collision energies is demonstrated through numerical results. The study confirms the indispensability of NNLO corrections for achieving accurate predictions in high-energy physics experiments.
Article
Physics, Particles & Fields
Stefano Catani, Simone Devoto, Massimiliano Grazzini, Stefan Kallweit, Javier Mazzitelli
Summary: The study provides a first fully differential calculation of the NNLO QCD radiative corrections to the production of bottom-quark pairs at hadron colliders. The calculations show significant reduction in perturbative uncertainties and highlight the importance of including NNLO corrections for an accurate theoretical description of the process. Comparison with experimental results is also performed to validate the predictions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Massimiliano Grazzini, Stefan Kallweit, Marius Wiesemann, Jeong Yeon Yook
Summary: This article focuses on the production of four charged leptons in hadron collisions and computes the next-to-leading order QCD corrections to the loop-induced gluon fusion contribution while considering the Higgs boson signal, background, and interference. The calculations are implemented in the MATRIX framework and show good agreement with recent ATLAS data, providing valuable insights into constraining the Higgs boson width through off-shell measurements.
Article
Astronomy & Astrophysics
Simone Alioli, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Riccardo Nagar, Davide Napoletano
Summary: A novel NNLO QCD calculation method matched to parton shower was proposed for the production of Z bosons decaying into four massless leptons at the LHC. The results show a good agreement with data from the ATLAS and CMS experiments, indicating the effectiveness of the method.
Article
Physics, Particles & Fields
Luca Buonocore, Massimiliano Grazzini, Juerg Haag, Luca Rottoli
Summary: In this study, we investigate the associated production of a vector or Higgs boson with a jet in hadronic collisions. When the transverse momentum of the boson jet system is much smaller than its invariant mass, the QCD perturbative expansion is affected by large logarithmic terms which need to be resummed to all orders. We discuss the structure of the resummation of logarithmically enhanced contributions up to next-to-leading logarithmic accuracy and provide explicit analytical results for the resummation coefficients.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Roberto Bonciani, Luca Buonocore, Massimiliano Grazzini, Stefan Kallweit, Narayan Rana, Francesco Tramontano, Alessandro Vicini
Summary: This study presents the first complete computation of the mixed QCD-electroweak (EW) corrections to the neutral-current Drell-Yan process. The two-loop virtual contribution is computed using semianalytical techniques, and the cancellation of singularities is achieved through an appropriate qT subtraction formalism. The results show that the mixed QCD-EW corrections are negative and increase in magnitude at high lepton pT values, with a maximum of about -15% compared to the next-to-leading-order QCD result at pT 1/4 500 GeV. Up to dilepton invariant masses of 1 TeV, the computed corrections amount to about -1.5% compared to the next-to-leading-order QCD result.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Stefano Catani, Simone Devoto, Massimiliano Grazzini, Stefan Kallweit, Javier Mazzitelli, Chiara Savoini
Summary: The associated production of a Higgs boson with a top-antitop quark pair is a crucial process at the LHC, which allows for the measurement of the top-quark Yukawa coupling. The computation of radiative corrections to this process at NNLO in QCD perturbation theory is presented. This is the first computation for a 2 -> 3 process with massive colored particles at this perturbative order. A soft Higgs boson approximation for loop amplitudes is developed to quantify the impact of the unknown two-loop contribution. The NNLO corrections at a center-of-mass energy of 13 TeV increase the NLO result for the total cross section by about 4% and reduce perturbative uncertainties significantly.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Simone Alioli, Georgios Billis, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Giulia Marinelli, Riccardo Nagar, Davide Napoletano
Summary: We have made several improvements to the Geneva method for matching NNLO calculations to parton shower programs. These include changes to the resummed calculation used in the matching procedure, modifications in the implementation of the splitting functions, and an improved treatment of timelike logarithms. These improvements have increased the stability of the numerical cancellation and showed good agreement with experimental data.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Luca Buonocore, Simone Devoto, Stefan Kallweit, Javier Mazzitelli, Luca Rottoli, Chiara Savoini
Summary: We calculate the hadroproduction of a W boson in association with a massive bottom quark-antiquark pair at NNLO in QCD perturbation theory. By using massive b quarks, we avoid the ambiguities associated with massless calculations and provide a realistic comparison with experimental data. Our results show substantial NNLO corrections that are necessary for reliable predictions.
Article
Astronomy & Astrophysics
Luca Buonocore, Massimiliano Grazzini, Jurg Haag, Luca Rottoli, Chiara Savoini
Summary: We propose a new k(T)(ness) variable to control the singularities of N+1-jet cross section and perform higher-order calculations in Quantum Chromodynamics. This variable performs well in evaluating next-to-leading order corrections for H+jet and Z+2 jet production at the LHC.
Review
Astronomy & Astrophysics
Simone Alioli, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Riccardo Nagar, Davide Napoletano, Christian W. Bauer, Luca Rottoli
Summary: Researchers extended the GENEVA Monte Carlo framework using the transverse momentum of a color-singlet system as the resolution variable, allowing for precise predictions through N3LL resummation. They presented satisfactory results for Drell-Yan lepton-pair production and assessed the impact of two different resolution variables on differential observables.
Article
Astronomy & Astrophysics
Luca Buonocore, Massimiliano Grazzini, Stefan Kallweit, Chiara Savoini, Francesco Tramontano
Summary: In this study, the mixed QCD-electroweak corrections to hadroproduction of a massive charged lepton and the corresponding neutrino through the Drell-Yan mechanism are computed for the first time. The cancellation of soft and collinear singularities is achieved, and real and virtual contributions are consistently included without approximation. The calculated corrections show qualitative agreement with a factorized approach and exhibit negative trends at large lepton transverse momenta, reaching about -20% at p(T) = 500 GeV compared to the next-to-leading-order QCD result.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
