In this report I will describe the latest results of the ALICE, ATLAS, CMS, and LHCb experiments in the fields of production, spectroscopy, and properties of heavy hadrons. In particular, I will concentrate on measurements of quarkonium production cross sections, polarization, and mass, on measurements of production cross sections and lifetimes of open heavy flavors, on the recent observations of new states and decay modes, and on other searches for new and exotic hadrons.
Latest results on the heavy flavour production and spectroscopy at the LHC are reviewed. These include measurements of production rates of the charmed and beauty hadrons, and observations of new excited charmed and beauty hadrons and exotic states.
The conventional description of heavy-flavour hadron production in pp collisions is based on a factorisation approach, assuming universal fragmentation functions among collision systems. Recent results on heavy-flavour baryon measurements from the LHC experiments show tensions with model calculations based on this approach and employing fragmentation functions constrained from e + e − and e − p collision experiments. In this contribution, the most recent results from ALICE, ATLAS, CMS and LHCb experiments on the heavy-flavour hadron production in pp collisions at the TeV scale are reported. The comparison with the theoretical predictions that address the baryon enhancement in hadronic collisions at the LHC is also discussed.
In the upcoming upgrades for Run 3 and 4, the LHC will significantly increase Pb-Pb and pp interaction rates. This goes along with upgrades of all experiments, ALICE, ATLAS, CMS, and LHCb, related to both the detectors and the computing. The online processing farms must employ faster, more efficient reconstruction algorithms to cope with the increased data rates, and data compression factors must increase to fit the data in the affordable capacity for permanent storage. Due to different operating conditions and aims, the experiments follow different approaches, but there are several common trends like more extensive online computing and the adoption of hardware accelerators. This paper gives an overview and compares the data processing approaches and the online computing farms of the LHC experiments today in Run 2 and for the upcoming LHC Run 3 and 4.
The CERN laboratory has released a new open data policy for the LHC experiments. Although this policy focuses on the common strategy for the release of research-quality data, it strengthens all aspects of open data, and reaffirms the commitment of all the LHC experiments towards open science. In this presentation we give a summary on the status of the open data efforts from each of the large LHC experiments as well as their plans and strategies under the new policy.
Measurements of inclusive and differential production cross-sections of top-quarks in pairs and in single top-quark modes as well as properties of their subsequent decays at the LHC are presented. Recent analyses of proton-proton collisions recorded by the ATLAS, CMS and LHCb detectors at centre-of-mass energies of 5, 7, 8 and 13 TeV and combinations of the results are discussed. Among the properties analysed are tests of lepton universality, the W-boson helicity, tests of CP violation, studies of b-quark-fragmentation, top-quark polarisation measurements and the mass of the top-quark.
Measurements of quarkonium production are valuable probes of the hot and dense medium created in heavy-ion collisions. The large data sample collected at the LHC provides a wealth of quarkonium measurements including a multitude of new observables. We report on the latest measurements of quarkonium production at the LHC focusing on new observables.
Recent results of the heavy flavors and jet production in proton-proton collisions using the data collected by the ALICE, ATLAS, CMS, and LHCb detector at the Large Hadron Collider are presented. These measurements are crucial for precise tests of electroweak and next-to-leadingorder pQCD calculations, improving the understanding of the proton structure. The measured results are compared with theoretical predictions from several Monte Carlo event generators using different parton shower simulations which provide valuable inputs for tuning of Monte Carlo event generators.
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