Classification Without Labels (CWoLa) is a Machine Learning strategy which can be used to classify event categories (e.g. quark jet vs gluon jet, or BSM signal vs SM background) starting from mixed event samples, which are inevitable at the LHC. I will illustrate how this strategy can be used to uncover BSM resonance signals which would otherwise be completely buried under large SM backgrounds...
We present an overview of searches for new physics with top and bottom quarks 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 heavy gauge bosons or excited third generation quarks. Decay channels to vector-like top partner quarks, such as...
We present results of searches for massive vector-like top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. Single and pair production of vector-like quarks are studied, with decays into a variety of final states, containing top and bottom quarks, electroweak gauge and Higgs bosons. We search...
Numerous new physics models, e.g., theories with extra dimensions and various gauge-group extensions of the standard model, predict the existence of new heavy resonances. Results of searches for new particles such as heavy bosons, leptoquarks, heavy neutrinos in final states with leptons, photons and jets are presented. The emphasis is given to the recent results obtained using data collected...
We investigate an excess observed in hadronic events in the archived LEP2 ALEPH data. The events are clustered into four jets and paired such that the mass difference between the two dijet systems is minimized. The excess occurs in the region $M_1+M_2\sim 110\mbox{ GeV}$; about half of the excess is concentrated in the region $M_1\sim 80\mbox{ GeV}$, $M_2\sim 25\mbox{ GeV}$, with a local...
Many new physics models, such as compositeness, see-saw, or extra dimension models, are expected to manifest themselves in final states with leptons, photons or jets. This talk presents searches for new non-resonant phenomena in various final states, focusing on recent results obtained using data collected at Run-II of the LHC.
The LEP experiment at CERN provided accurate measurements of the Z neutral gauge boson properties. Although all measurements agree well with the SM predictions, the forward backward asymmetry of the bottom-quark remains almost 3σ away from the SM value. We proposed that this anomaly may be explained by the existence of a new U(1)D gauge boson, which couples with opposite charges to the...
Hints for new physics beyond the standard model at the LHC are scarce. An exception are B-anomalies reported by LHCb in R_K and R_K* measurements, the latter two combining to a 4 sigma deviation from the SM.
A possible explanation of this excess might be a new heavy neutral gauge boson Z' with flavour-conserving couplings to second and third generation leptons, as well as third generation...