QCD@LHC 2018

Session

Heavy Quarks

27 Aug 2018, 14:30

POT/51 (TU Dresden)

Conveners

Heavy Quarks: Joint with EW, Higgs and BSM

• Thorsten Kuhl (Deutsches Elektronen-Synchrotron (DE))
• Pietro Govoni (Universita & INFN, Milano-Bicocca (IT))
• Jonas Lindert (University of Durham (GB))
• Guido Bell (University of Siegen)

Heavy Quarks

• There are no conveners in this block

Heavy Quarks

• There are no conveners in this block

Heavy Quarks

• There are no conveners in this block

56. Top quark production cross-section measurements

Knut Zoch (Georg August Universitaet Goettingen (DE))

27/08/2018, 14:30

Heavy Quarks

Measurements of the inclusive and differential cross-sections for top-quark pair and single top production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider are presented at center-of-mass energies of 8 TeV and 13 TeV. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. These...

76. NLO predictions for $t \bar{t}$ + $b \bar{b}$ production in association with a light-jet at the LHC

Federico Buccioni (University of Zurich)

27/08/2018, 15:00

Heavy Quarks

Precise measurements of Higgs boson production in association with top-quark pairs
allow for constraints on the top-quark Yukawa coupling, which in turn is crucial to fully
characterise the scalar sector of the Standard Model and could also open a window on
Beyond-the-Standard-Model interactions. At the Large Hadron Collider, searches for
$t\bar{t}H$ production in the dominant $H \to b...

111. Associated top quark pair production with a Higgs boson: theoretical predictions

Anna Katarzyna Kulesza (Westfaelische Wilhelms-Universitaet Muenster (DE))

27/08/2018, 15:30

Heavy Quarks

The investigation of the $pp \rightarrow t {\overline t} H$ process is among the highest priorities of the current LHC physics program. Correspondingly, improvements in precision with which theoretical predictions for this process are known are of central importance. In this talk the recent progress concerning theoretical predictions for the signal will be reviewed.

88. Top-quark pair production beyond NNLO

Jan Piclum (University of Siegen)

28/08/2018, 16:30

Heavy Quarks

The total top-antitop production cross section at hadron colliders is
one of the key observables of the Standard Model. Comparisons of LHC
measurements with theoretical calculations are being used to determine
the top-quark mass and the strong coupling and are included in global
PDF fits. These applications are currently based on calculations at
the next-to-next-to-leading order (NNLO) in QCD...

57. Top quark properties and mass measurements with the ATLAS detector

Kevin De Vasconcelos Corga (Centre National de la Recherche Scientifique (FR))

28/08/2018, 17:00

Heavy Quarks

The top quark is unique among the known quarks in that it decays before it has an opportunity to form hadronic bound states. This makes measurements of its properties particularly interesting as one can access directly the properties of a bare quark. The latest measurements of these properties with the ATLAS detector at the LHC are presented using 8 TeV and 13 TeV data. Limits on the rate of...

67. Hard Photons in Hadroproduction of Top Quarks with Realistic Final States

Torsten Weber (RWTH Aachen University)

28/08/2018, 17:30

Heavy Quarks

We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for e+νeμ−ν¯μbb¯γ production and includes all resonant and non-resonant diagrams, interferences, and off-shell effects of the top quarks and the W gauge bosons. This calculation constitutes the first...

92. Flavour Anomalies in Rare Decays at LHCb

Christoph Michael Langenbruch (Rheinisch Westfaelische Tech. Hoch. (DE))

30/08/2018, 14:30

Heavy Quarks

Rare decays are powerful probes for Physics beyond the Standard Model
(SM), as new particles can have a large impact on physics observables.
Recent results on lepton universality tests and measurements of
branching fractions and angular distributions of rare b->sll decays have
shown tensions with the SM predictions. The LHCb experiment is ideally
suited for the study of the these flavour...

96. Long-distance effects in B->K(*) l+ l-

Danny van Dyk (TU München)

30/08/2018, 15:00

Heavy Quarks

I will discuss recent developments regarding long-distance effects in B->K(*)l+ l- decays.
Precise knowledge of these effects is needed for the interpretation of the present anomaly seen in the experimental results. The approach I discuss relies on the analytic properties of the hadronic matrix elements. It combines the available theory information beyond the physical phase space with...

94. CP Violation in pure hadronic three-body B meson decays

Dr Keri Vos (Siegen University)

30/08/2018, 15:30

Heavy Quarks

The search for CP violation is a large part of the flavour programs at LHCb and the B factories, with pure hadronic decays as the key players. Three-body decays, which form a large part of the B meson branching fraction, contain much more information than two-body decays, because of their non-trivial kinematic structure. Recently, these decays were described using a QCD factorization framework...

3. Combination and QCD analysis of beauty and charm production cross section measurements in deep inelastic ep scattering at HERA

30/08/2018, 16:30

Heavy Quarks

Measurements of open charm and beauty production cross sections in deep inelastic $ep$ scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in the kinematic range of negative four-momentum transfer squared of the photon $2.5$~GeV$^2\le Q^2 \le 2000$ GeV$^2$ and Bjorken scaling variable $3 \cdot 10^{-5} \le x_{\rm Bj} \le 5 \cdot 10^{-2}$. The...

11. Three loop QCD corrections to heavy quark form factors

Dr Narayan Rana (DESY)

30/08/2018, 17:00

Heavy Quarks

We present color planar and complete light quark QCD contributions to the three loop heavy quark form factors in the case of vector, axialvector, scalar and pseudoscalar currents. We evaluate the master integrals applying a new method based on differential equations for general bases, which is applicable for all first order factorizing systems. The analytic results are expressed in terms of...

97. Exotic and Conventional Quarkonium Physics Prospects at Belle II

Bianca Scavino (Uni Mainz)

30/08/2018, 17:30

Heavy Quarks

The Belle II experiment, now operating at the KEK laboratory in Japan, is a substantial upgrade of both the Belle detector and the KEKB $e^+ e^-$accelerator. It aims to collect 50 times more data than existing B-Factory samples. Belle II is uniquely capable to study the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now...

55. ATLAS recent results on production, spectroscopy and exotica in Quarkonia and Heavy Flavour

ATLAS Collaboration

Heavy Quarks

Heavy quark spectroscopy and exotic states are studied with the ATLAS detector, mainly through final states containing muon pairs from J/psi decays. This talk will summarise recent results from ATLAS, including production of quarkonium and heavy flavour, searches for exotic states and measurements of decay properties in open beauty production.

91. CP-violation measurements in B->DX decays at LHCb

Katharina Mueller (Universitaet Zuerich (CH))

Heavy Quarks

Measurements of CP violation are a core part of the LHCb physics
programme and provide sensitivity to angles of the CKM matrix as well as
probing our understanding of the differences between matter and
antimatter. A summary of recent LHCb results are presented, including
the time-dependent B0->Dpi analysis which profits from the largest
flavour tagged sample analysed by LHCb, the world's first...

69. Spectroscopy and decay widths of pseudoscalar and vector charmonium and bottomonium within the applications of Bethe - Salpeter equation

Dr Hluf Negash (Samara University)

Heavy Quarks

In this study, we calculate the mass spectrum, weak decay constants, two photon decay widths, and two gluon decay widths of ground (1S), and radially excited (2S, 3S, 4S) states of pseudoscalar charmoniuum and bottomonium such as η_cand η_b, as well as the mass spectrum, leptonic decay constants and radiative decay widths of ground state (1S) and excited (2S, 1D, 3S, 2D, 4S,3D, 5S, 5D) states...

110. ttH Theory

24. ttH(bb) in the all-hadronic final state

CMS Collaboration

Heavy Quarks

We present a search for the standard model Higgs boson decaying into b quarks and produced in association with a pair of top quarks decaying in the all-jet final state. This search is performed on 35.9 fb-1 of 13-TeV proton-proton collisions collected by the CMS experiment at the LHC. To separate the tt̄H signal from the irreducible tt̄ + bb̄ background, this analysis takes advantage of a...