951 research outputs found
A view of coherent elastic neutrino-nucleus scattering
No full textWe review the physics of coherent elastic neutrino-nucleus scattering and the results and perspectives for the measurements of the radius of the neutron distribution of the nucleus, of the weak mixing angle, and of new neutrino interactions due to physics beyond the Standard Model
LHCb detector and trigger performance in Run II
No full textThe LHCb detector is a forward spectrometer at the LHC, designed to perform high precision studies of b- and c- hadrons. In Run II of the LHC, a new scheme for the software trigger at LHCb allows splitting the triggering of events into two stages, giving room to perform the alignment and calibration in real time. In the novel detector alignment and calibration strategy for Run II, data collected at the start of the fill are processed in a few minutes and used to update the alignment, while the calibration constants are evaluated for each run. This allows identical constants to be used in the online and offline reconstruction, thus improving the correlation between triggered and offline selected events. The required computing time constraints are met thanks to a new dedicated framework using the multi-core farm infrastructure for the trigger. The larger timing budget, available in the trigger, allows to perform the same track reconstruction online and offline. This enables LHCb to achieve the best reconstruction performance already in the trigger, and allows physics analyses to be performed directly on the data produced by the trigger reconstruction. The novel real-time processing strategy at LHCb is discussed from both the technical and operational point of view. The overall performance of the LHCb detector on the data of Run II is presented as well
Lifetime measurements in -hadron decays at LHCb
No full textPrecision lifetime measurements of -flavoured hadrons are an important test of the validity of the theoretical tool used to determine -hadrons observables, the Heavy Quark Expansion. Recent measurements of the , , , and hadrons lifetimes are reported. Moreover, several and effective lifetime measurements are discussed, as well as a measurement of the decay width difference in the system, . All the measurements have been performed using collision data collected with the LHCb detector.Precision lifetime measurements of -flavoured hadrons are an important test of the validity of the theoretical tool used to determine -hadrons observables, the Heavy Quark Expansion. Recent measurements of the , , , and hadrons lifetimes are reported. Moreover, several and effective lifetime measurements are discussed, as well as a measurement of the decay width difference in the system, . All the measurements have been performed using collision data collected with the LHCb detector
Lepton Flavour Universality at LHCb
No full textLepton Flavour Universality implies the equality of the coupling between the gauge bosons and the three families of leptons. Semileptonic and rare decays of b quarks provide an ideal laboratory to test this property and to search for physics beyond the Standard Model. In these proceedings a review of the recent Lepton Flavour Universality tests performed using data collected by the LHCb experiment in 2011 and 2012 are presented
CP Violation Results from LHCb
No full textMeasurements of CP violation in decays of beauty- and charm-hadrons provide a fundamental test of Standard Model (SM) predictions and represent a sensitive probe to search for physics effects beyond the SM. In these proceedings, precision measurements are presented of several observables related to the so-called unitary triangles, that arise from the unitarity requirements on the 3x3 Cabibbo-Kobayashi-Maskawa matrix describing the quark mixing as well as the first observation of CP violation in the charm system. The discussed analyses are based on proton-proton collision data collected during 2011–2012 (LHC Run 1) and 2015–2018 (LHC Run 2) by the LHCb experiment
Medusa, a multithread 4-body decay fitting and simulation software
No full textWe present a new C++14 compliant application to perform physics data analyses of generic 4-body decays in massively parallel platforms. Medusa is highly based on Hydra, a header-only library which hides most of the complexities of writing parallel code for different architectures. Medusa has been tested through the measurement of the CP-violating phase ϕsin b-hadron decays exploiting the data collected by the LHCb experiment. Medusa executes the optimization of the full model, running over 500000 events, until 330 times faster than a non-parallelized program. Medusa is freely available on GitHub under GPL v.3.0 license
Revealing new processes with superfluid liquid helium detectors: the coherent elastic neutrino atom scattering
No full textPresentation given at the 2019 Magnificent CEvNS workshop on the subject of coherent elastic neutrino-atom scattering
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