QCD@LHC 2026

Session

Heavy Quarks

28 Sept 2026, 16:00

University of Oxford

62. Analytic Computation of the Two-Loop Penguin Jet Function

Kevin Brune (JGU Mainz)

Heavy Quarks

Standard slot

In this talk, I will present recent progress in the analytic computation of the two-loop penguin jet function. This function is a key ingredient in the factorised description of the $Q_1$-$Q_{7\gamma}$ interference contribution to inclusive (B)-meson decays, which constitutes an important source of theoretical uncertainty in precision flavour physics. Its analytic computation therefore...

36. ATLAS results on associated top quark production (Top+X) and EFT interpretations

ATLAS Collaboration

Heavy Quarks

Standard slot

The high center-of-mass energy of proton-proton collisions and the large available datasets at the CERN Large Hadron Collider allow the study of rare processes of the Standard Model with unprecedented precision. Measurements of rare SM processes provide new tests of the SM predictions with the potential to unveil discrepancies with the SM predictions or provide important input for the...

37. ATLAS results on top properties and threshold region

ATLAS Collaboration

Heavy Quarks

Standard slot

In this contribution, the top quark mass measurements by the ATLAS experiment are reviewed. In addition, new ATLAS results on top-quark properties are shown. Finally, results of the measurements around the top pair production threshold are summarised.

38. ATLAS results on top quark cross section measurements and recent progress on modelling

ATLAS Collaboration

Heavy Quarks

Standard slot

The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of theoretical predictions using an extensive sample of top quark events. Measurements of the inclusive top quark production rates at the LHC have reached a precision of several percent and test advanced Next-to-Next-to-Leading Order...

56. Complete NLO corrections to off-shell $t \bar{t}$ production in the $\ell+j$ decay channel

Leon Mans (RWTH Aachen University)

Heavy Quarks

Standard slot

We present the calculation of the complete NLO corrections to the off-shell top-quark pair production in the $\ell+j$ decay channel, denoted as $pp \to \ell^- \bar{\nu}_{\ell}\, j_b j_b \,jj + X$, where $\ell^- = e^-,\, \mu^-$. The calculation consistently preserves the finite-width effects of the top quarks and massive gauge bosons, as well as takes into account all doubly-, singly-, and...

118. Flavor Anomalies and Lepton Flavor Universality at CMS

Bhawna Gomber (University of Hyderabad, India)

Heavy Quarks

Standard slot

Over the past decade, several measurements in the flavor sector performed at dedicated beauty experiments, such as BELLE, BaBar and LHCb, have shown a significant tension with respect to SM predictions. The flavor puzzle of the SM remains one of the open questions in high energy particle physics up until today and needs further investigation. This talk summarizes flavor measurements performed...

66. Hadronization studies at LHCb

Carlos Vazquez Sierra (Universidade da Coruña (ES))

Heavy Quarks

Standard slot

The forward coverage of the LHCb detector (2 < η < 5) provides an interesting setting to
study hadronization in jets. LHCb is particularly well-suited for studying hadronization in
events initiated by light-quarks and heavy-quarks, given the enhancement of the relevant
cross sections at forward rapidities and the capability of cleanly tagging these events.
Heavy-flavour-tagged events are...

34. Heavy-flavour jet measurements with ALICE

Yoshini Bailung (Institut de Physique des 2 Infinis (IP2I) de Lyon, CNRS-IN2P3, Université de Lyon)

Heavy Quarks

Standard slot

Measurements of heavy-flavour jets in pp collisions provide important tests of Quantum Chromodynamics (QCD) calculations. Jet substructure observables offer insight into the parton-shower evolution and the different radiation patterns of quarks and gluons arising from the different Casimir colour factors and parton masses. Comparisons between jets containing heavy-flavour baryons or...

27. Matching flavour schemes via isolation of heavy-quark mass power corrections

Christian Biello (ETHZ)

Heavy Quarks

Standard slot

Higgs production in association with quarks (QQH) offers an interesting setting to study heavy-quark mass effects and the interplay between factorisation schemes in precision QCD. We present a strategy to combine the massive- (4FS in bbH) and massless schemes (5FS in bbH) consistently at the fully differential level for fixed-order QQH predictions in a general-mass variable-flavour-number...

65. NNLO QCD corrections to $t\bar{t}W$ production at the LHC

Vsevolod Chestnov (University of Oxford)

Heavy Quarks

Standard slot

In this talk I will present the numerical calculation of two-loop QCD amplitude
for the associated production of a top-anti-top pair and a $W$ boson in the
leading-colour approximation.

The amplitude is expressed as linear combinations of special transcendental
functions with rational function coefficients, evaluated using differential
equations and finite-field techniques,...

54. State-of-the-art predictions for four-top production with invariant-mass threshold resummation.

Tommaso Saracco (Nikhef)

Heavy Quarks

Standard slot

Four-top production is one of the rarest Standard Model processes observable at the Large Hadron Collider, offering sensitivity to the top-Yukawa coupling, Higgs width, and beyond-Standard-Model physics. We present precise predictions for the invariant-mass distribution and total cross section using threshold resummation at next-to-next-to-leading logarithmic (NNLL) accuracy, matched to NLO in...

59. Substructure of Heavy Quark Jets

Daniel Reichelt

Heavy Quarks

Standard slot

We will present new results for the jet substructure of heavy quark initiated jets, focussing on jet angularities measured on jets initiated by a b-quark and discuss phenomenological results from arXiv:2606.20798.

26. Top quark mass interpretation from simulation of top-flavoured mesons

Alexander Lind (INFN Laboratori Nazionali di Frascati (LNF))

Heavy Quarks

Standard slot

The interpretation of the top quark mass measurements in terms of well-known field theory definitions has been the topic of a long-standing discussion. In this work we reconsider this issue and simulate fictitious top-flavoured mesons, whose mass can be related to any top mass definition, such as the pole mass, by means of Heavy Quark Effective Theory. We explore final-state observables for...

69. Top quark pair in the threshold at the LHC: NRQCD and key-uncertainties

Giovanni Limatola (II. Institute for Theoretical Physics University of Hamburg)

Heavy Quarks

Standard slot

We present predictions for top quark pair production at the LHC in the threshold region, including quasi-bound-state effects associated with Coulomb interactions within the framework of NRQCD. We focus on the invariant mass distribution of the produced top quark pair, incorporating NLL soft-gluon threshold resummation.
A detailed study of the theoretical uncertainties affecting these...

97. Top Quark Pair Production and Decay: The 1-Higgs-Singlet Model and Pseudoscalar Decay

Vishakha Lingadahally

Heavy Quarks

Standard slot

The process of top quark pair production through the decay of the scalars in the 1 Higgs Singlet extension of the Standard Model is associated with large interference effects between the loop-induced 'SM-like' Higgs and the heavy Higgs amplitudes, and the QCD continuum background. We attach leptonic decays to the di-top final state at NLO and study the effects of spin correlation in the...