Conveners
Parallel session B: QCD
- Marat Siddikov
Parallel session B: QCD
- Gorazd Cvetic (Universidad Tecnica Federico Santa Maria)
The ATLAS experiment has investigated strong force dynamics via searches for exotic hadron states and measurements of production rates. Studies of potential pentaquark and tetraquark candidates will be discussed, as will measurements of charmonium and B hadron differential cross sections.
According to SM, the electroweak bosons couple to the three lepton families with the same strength, the only difference in their behaviour being due to the difference in mass. In recent years, some deviations from the SM predictions have been observed in b→cℓνℓ transitions. These measurements have been made by calculating R-values, which represent the ratio of branching fractions for b decays...
An overview of the latest NA62 results and the future prospect of the experiment are presented. The NA62 experiment at CERN collected the world’s largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the branching ratio of the ultra-rare 𝐾+→𝜋+𝜈𝜈¯ decay, based on 20 candidates.
The radiative kaon decay 𝐾+→𝜋0𝑒+𝜈𝛾 (Ke3g) was studied with a data sample of...
We discuss the behavior of the Jpsi transverse-momentum distribution in the color evaporation model (CEM) at NLO. Our calculations use transverse-momentum-dependent PDFs and include a timelike parton shower. The latter solves the issue of the too-hard spectrum at NLO in the CEM. Finally, we will present the consequence of the present study for the NRQCD's LDME.
The large top quark samples collected with the ATLAS experiment at the LHC have yielded measurements of the production cross section of unprecedented precision and in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible, enabled the observation of many rare top quark production processes predicted by the Standard Model and...
We assess the impact of the full luminosity LHC Run II top quark measurements on global PDF and SMEFT analyses as well as on their mutual interplay. Starting from the widest LHC top quark dataset considered to date, we first assess the constraints it provides on the gluon PDF in the NNPDF4.0 framework and study its consistency with other gluon-sensitive measurements. We then carry out an...
In this talk we analyze exclusive photoproduction of heavy quarkonia pairs in the kinematics of moderate values of Bjorken variable 𝑥𝐵. We discuss the relation of various observables to gluonic generalized parton distributions (GPDs) of the target. We demonstrate that the largest cross-section has exclusive production of 𝐽/𝜓𝜂𝑐 pairs, which gets the dominant contribution from the unpolarized...
The ATLAS experiment is able to probe potential beyond the Standard Model physics by performing precise measurements of B meson decays. In particular this talk will highlight the branching fractions of rare decays B_s and B -> mu mu and CP violation in B_s -> J/psi phi, which can both be altered by new physics.
A search is reported for low-mass structures in the J/ψJ/ψ mass spectrum produced by proton-proton collisions at s√=13TeV. The data sample corresponds to an integrated luminosity of 135 fb−1 collected by the CMS experiment at the LHC. Modelling signals with relativistic Breit-Wigner shapes, and under the assumption of the absence of interference between signal components, and between signal...
