Description
https://zoom.us/j/98248822832
The talk will present highlights on recent results by the CMS experiment on top-quark production cross sections and top-quark properties
The search for the associated production of a Higgs boson with a top quark-antiquark pair will be presented. Candidate $t \bar{t}H$ events are selected with criteria enhancing respectively the dileptonic, semileptonic and fully hadronic decay channels of the $t \bar{t}$ system and the decay of the Higgs boson into a bottom quark-antiquark pair (H $\rightarrow b\bar{b}$ ). In order to increase...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. This talk presents measurements of Higgs boson properties using various decay modes of the Higgs boson. The different production mode cross sections are determined, simplified template cross sections are measured, and interpretations of the results in different frameworks are obtained.
We study the prospects of observing the non-resonant Higgs pair production in the Standard Model (SM) at the high luminosity run of
the 14 TeV LHC (HL-LHC), upon combining multiple final states chosen on the basis of their yield and cleanliness, namely, $b\bar{b}\gamma \gamma, b\bar{b} \tau^+ \tau^-, b\bar{b} WW^*, WW^*\gamma \gamma$ and $4W$ channels by employing multivariate analyses using...
The next CERN project - High Luminosity LHC (HL-LHC), which is aimed at ten-fold increase in the luminosity of proton-proton collisions at energy of 14 TeV, is expected to start operation in 2027/28 and will deliver an unprecedented scientific data volume of multi-exabyte scale. This amount of data has to be stored and the corresponding storage system should ensure fast and reliable data...
The Large Hadron Collider (LHC) has been successfully delivering proton-proton collision data at the unprecedented center-of-mass energy of 13 TeV. An upgrade is planned to increase the instantaneous luminosity delivered by the LHC, in what is called the HL-LHC, aiming to deliver a total of about 3000/fb of data to the ATLAS detector. To cope with the expected data-taking conditions ATLAS is...
The rich physics program of CMS experiment depends on the ability to trigger, reconstruct and identify events with electrons and photons with the CMS detector with excellent efficiency and precision. This talk will present an overview of reconstruction and identification of electrons and photons in the CMS detector at the Run2 of LHC, and plans for upcoming Run3. The reconstruction of the...
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure...
Observation of neutral long-lived particle (LLP) can be the first sign for physics beyond the Standard Model at the LHC. These particles are invisible until they decay into detectable Standard Model particles some macroscopic distance away from the collision. Their existence is theoretically well motivated and can provide explanations to known unexplained phenomena such as Dark Matter, the...
Recent results from the ATLAS experiment on production, decays and spectroscopy of heavy flavour hadrons will be presented. The latest results on the CP violation in B_s to J/psi phi decays will be discussed. Measurements of the inclusive and associated charmonium production will be also reported. In addition, searches for pentaquarks with hidden charm and recent results on B_c meson...
Studies of excited states of beauty mesons and baryons, performed at the CMS experiment, are presented. The analyses use Run-2 data, collected in pp collisions at $\sqrt{s}=13$ TeV.
on behalf of the LHCb collaboration
The LHCb detector at the Large Hadron Collider is one of the best instruments for charmed baryon spectroscopy available today. Due to its unique design and characteristics as well as stable operation of the LHC, the detector enables measurements of rare and suppressed decays with high accuracy.The report is devoted to the recent observations of the...
The CKM angle $\gamma$ is the least well known of the angles of the unitarity triangle and the only one that is accessible with tree-level decays in a theoretically clean way. The key method to measure $\gamma$ is through the interference between $B^+\to D^0 K^+$ and $B^+ \to \bar D^0 K^+$ decays which occurs if the final state of the charm-meson decay is accessible to both the $D^0$ and $\bar...
Recent CMS results on exotic states, including X(3872) and search for new states decaying into Y(1S)mu+mu-, are presented. The analyses are based on data, collected by the CMS experiment in pp collisions at sqrt(s)=13 TeV
In the Standard Model, the flavor-changing neutral currents of the $b \to s$ and $b \to d$ transitions appear as vacuum effects, at the one-loop level. Rare semileptonic decays of $B$-mesons, originating by these currents, are extremely useful tools for testing the Standard Model and searching for a possible physics beyond the Standard Model. Differential branching fractions of semileptonic...
Recently the LHCb Collaboration reported about the observation of four excited states $\Omega_b (6316)$, $\Omega_b (6330)$, $\Omega_b (6340)$, and $\Omega_b (6350)$ in the $\Xi_b^0 K^-$ invariant mass spectrum. Possible spin-parity assignments of these resonances in the Quark-Diquark Model as $P$-wave baryons is discussed and a comparison with theoretical predictions based on the heavy-quark...
The presence of a non-baryonic dark matter component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model it would be produced at the LHC, escaping the detector and leaving a large missing transverse momentum as their signature. The ATLAS detector has developed a broad programme to directly search for DM. ...
Various models of physics Beyond the Standard Model lead to signatures with long-lived particles, such that the decay of the new particle is at a significant distance from the collision point. These striking signatures provide interesting technical challenges due to their special reconstruction requirements as well as their unusual backgrounds. This talk will present recent results in searches...
The unprecedented LHC dataset is being explored looking for massive particles decaying in a plethora of ways. We give the latest results from ATLAS on searches for new heavy particles decaying to known particles, X->ttbar, tb, bb, VV, VH, HH, Hgamma, tautau, and on searches involving a decay to potential unknown ones, X->ZH' and X->AB. All these analyses use the full run 2 dataset.
We present an overview of searches for new physics with top and bottom quarks and top-pair in the final state, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. The results cover non-SUSY based extensions of the SM, including new heavy gauge bosons, like a W' boson replicating the features of its standard model counterpart,...
Many beyond the Standard Model signatures predict new particles that decay into final state containing both leptons and jets. In particular, 3rd generation leptons and quarks can significantly increase the sensitivity to new physics. This talk will present new search results for massive particles by the ATLAS experiment using the full Run 2 dataset. A particular focus is given to searches...
Many scenarios of physics beyond the Standard Model predict new particles with masses well below the electroweak scale. Low-energy, high luminosity colliders such as BABAR are ideally suited to discover these particles. We present several recent searches for low-mass dark sector particles at BABAR, including leptophilic scalars, new gauge bosons coupling only to the second and third generation...
