# Posters

Последние добавления:
2018-03-14
10:41
Il Bosone di Higgs

 Reference: Poster-2018-617 Keywords:  ATLAS  Higgs  Poster  Divulgazione  BEM  Meccanismo di Higgs  Meccanismo BEH  A0 Created: 2018. -1 p Creator(s): Hemmer, Sabine Poster di ATLAS sul bosone di Higgs indirizzato al pubblico generico, che spiega il meccanismo di Brout-Englert-Higgs e la sua importanza. Spiega anche il ruolo del Bosone di Higgs, come viene cercato, il percorso della sua scoperta e cosa viene dopo la scoperta. Disponibile anche in Francese (https://cds.cern.ch/record/1697501) e Inglese (https://cds.cern.ch/record/1697389). Non esitate a utilizzarlo nelle sedi dei vostri Istituti e negli eventi divulgativi! Il poster è in formato A0. Cliccate sull'immagine per scaricare il .pdf ad alta qualità e stamparlo dove preferite. Per qualisasi domanda o commento potete contattare atlas-outreach-coordination@cern.ch Related links:English Version © CERN Geneva Access to files

2018-03-06
14:44
Time-dependent CP violation in $B^0_{(s)} \to h^+h^-$ decays
 Reference: Poster-2018-616 Created: 2018. -1 p Creator(s): Fazzini, Davide The direct and mixing-induced CP-violating asymmetries in $B^0 \to \pi^+ \pi^-$ and $B_s \to K^+ K^-$ decays have been measured using a sample of pp collisions collected by the LHCb experiment during the Run1 of the LHC and corresponding to an integrated luminosity of 3.0 fb$^{-1}$.The time-integrated CP asymmetries in $B^0 \to K^+ \pi^-$ and $B_s \to \pi^+ K^-$ decays have also been measured, using the same data sample.The measurements of the CP-violating asymmetries of the $B^0 \to \pi^+ \pi^-$, $B_s \to K^+\pi^-$ and $B_s \to \pi^+K^-$ decays are the most precise from a single experiment. The measurements of the CP-violating asymmetries of the Bs->KK decays are compatible with the previous results from LHCb. © CERN Geneva Access to files

2018-03-06
14:25
Observation of the decay $B \to p\overline{p}\mu\nu$ and Lepton Flavour Universality with $B \to p\overline{p}\mu\nu$
 Reference: Poster-2018-615 Created: 2018. -1 p Creator(s): Tilley, Matthew James The first observation of the $B \to p\overline{p}\mu$ decay should be possible at the LHCb experiment with a significance far in excess of 5$\sigma$ . As well as a branching fraction measurement, a precision measurement of the $p\overline{p}$ mass spectrum will be performed. The ratio of branching fractions $\mathcal{B}(B \to p\overline{p}\tau)/\mathcal{B}(B \to p\overline{p}\mu)$ is a test of lepton flavour universality in the Standard Model. This measurement is in progress at LHCb and would be the first test involving a $b\to u\tau\nu$ transition. © CERN Geneva Access to files

2018-03-02
14:03
Luminosity Measurements at LHCb for Run II
 Reference: Poster-2018-614 Created: 2018. -1 p Creator(s): Coombs, George A precise measurement of the luminosity is a necessary component of many physics analyses, especially cross-section measurements. At LHCb two different direct measurement methods are used to determine the luminosity: the “van der Meer scan” (VDM) and the “Beam Gas Imaging” (BGI) methods. A combined result from these two methods gave a precision of less than 2% for Run I and efforts are ongoing to provide a similar result for Run II. Fixed target luminosity is determined with an indirect method based on the single electron scattering cross-section. © CERN Geneva Access to files

2018-03-02
13:59
Measurement of $B_{s}$ using $J/\psi \pi^{+}\pi^{-}$ at LHCb
 Reference: Poster-2018-613 Created: 2018. -1 p Creator(s): Liu, Xuesong The measurement of violating phase $phi_{s}$ is one of the key goals of the LHCb experiment. It will be performed via a time-dependent amplitude analysis. This poster summaries the measurement of $phi_s$ using $B_{s}\to J/\psi \pi{+}\pi^{-}$ at LHCb using Run-I and years 2015-2016 of Run-II data. The results are compatible with SM predictions. © CERN Geneva Access to files

2018-03-02
10:39
Angular analysis of $\Lambda_{b} \rightarrow \Lambda \mu^{+}\mu^{-}$
 Reference: Poster-2018-612 Created: 2018. -1 p Creator(s): Chatzikonstantinidis, Georgios The angular analysis of the rare baryon decay of $\Lambda_{b}\rightarrow \Lambda (\rightarrow p\pi^{-})\mu^{+}\mu^{-}$ in high $q^{2}$ is presented. The dataset that is used corresponds to an integrated luminosity of 5.0 fb$^{-1}$ of pp - collision data collected at centre-of-mass energies between 7 and 13 TeV by the LHCb detector in 2011, 2012, 2015 and 2016. Angular observables are determined using a moment analysis of the angular distribution. © CERN Geneva Access to files

2018-03-02
10:29
$\Xi_{cc}$ decays and properties
 Reference: Poster-2018-611 Created: 2018. -1 p Creator(s): Traill, Murdo Thomas The $\Xi$ particles are baryons contains 2 constituent charm quarks in their structure which are expected to decay to high multi-body ﬁnal states. The LHCb detector is ideally designed for studies of them due to its excellent particle identiﬁcation and vertex reconstruction. Its capabilities in this area of physics was ﬁrmly demonstrated when LHCb announced the discovery of the ﬁrst ever doubly charmed baryon, $\Xi^{++}_{cc}$, in decays of $\Xi^{++}_{cc} \to \Lambda^+K^-\pi^+\pi^+$ in 2017. This doubly charmed baryon was observed as a highly signiﬁcant structure in the $\Lambda^+_c K^-\pi^+\pi^+$ mass spectrum from proton-proton collision data recorded by the LHCb detector in Run2. A yield of 313 $\pm$ 33 $\Xi^{++}_{cc}$ candidates is measured and the local signiﬁcances is in excess of 12 $\sigma$ in the 13 TeV data. The properties of the peak suggest it is inconsistent with being a strongly decaying state. From the 13 TeV data, the mass is measured to be $3621.40\pm 0.72(stat.) \pm 0.27(syst.) \pm 0.14( \Lambda^+_c) MeV/c^2$. More analyses in the doubly charmed baryon sector using LHCb data are now well advanced. This includes, but is not limited to, searches for the singly charged $\Xi^{+}_{cc}$ state as well as the lifetime measurement of the $\Xi^{++}_{cc}$ state. © CERN Geneva Access to files

2018-03-02
10:00
Monitoring radiation damage in the LHCb Silicon Tracker
 Reference: Poster-2018-610 Created: 2018. -1 p Creator(s): Graverini, Elena The purpose of LHCb is to search for indirect evidence of new physics in decays of heavy hadrons. The LHCb detector is a single-arm forward spectrometer with precise silicon-strip detectors in the regions with highest particle occupancies. The non-uniform exposure of the LHCb sensors makes it an ideal laboratory to study radiation damage effects in silicon detectors. The LHCb Silicon Tracker is composed of an upstream tracker, the TT, and of the inner part of the downstream tracker (IT). Dedicated scans are regularly taken, which allow a precise measurement of the charge collection efficiency (CCE) and the calibration of the operational voltages. The measured evolution of the effective depletion voltage $V_{depl}$ is shown, and compared with the Hamburg model prediction. The magnitudes of the sensor leakage current are also analysed and compared to their expected evolution according to phenomenological models. Our results prove that both the TT and the IT will withstand normal operation until the end of the LHC Run II, after which they will be replaced in the context of the LHCb upgrade. © CERN Geneva Access to files

2018-03-02
09:58
Search for the Lepton Flavor Violating decays $B^0_{(s)} \to \tau^\pm \mu^\mp$ at LHCb
 Reference: Poster-2018-609 Created: 2018. -1 p Creator(s): Arnau Romeu, Joan Lepton Flavor Violating (LFV) $B$ decays, such as $B^{0}_{(s)}\rightarrow\tau^{+}\mu^{-}$, are forbidden in the Standard Model (SM) in the absence of non-zero neutrino masses, but can occur via one-loop diagrams if neutrino oscillations are included. This implies that the rate of these kind of processes is very suppressed, beyond the current and future experimental sensitivities. However, a wide variety of New Physics scenarios predict dramatically higher rates for these processes. The poster presents the search for the LFV decays $B^{0}_{(s)}\rightarrow\tau^{+}\mu^{-}$ using 2011 and 2012 data of the LHCb experiment. The studied $\tau$ decay mode is $\tau\rightarrow\pi^{+}\pi^{-}\pi^{+}\nu_{\tau}$. The analysis is currently blinded and in review. © CERN Geneva Access to files

2018-03-02
09:49
The LHCb RICH Upgrade: Development of the DCS and DAQ system.
 Reference: Poster-2018-608 Created: 2018. -1 p Creator(s): Cavallero, Giovanni The LHCb experiment is preparing for an upgrade during the second LHC long shutdown in 2019-2020. In order to fully exploit the LHC flavour physics potential with a five-fold increase in the instantaneous luminosity, a trigger-less readout will be implemented. The RICH detectors will require new photon detectors and a brand new front-end electronics. The status of the integration of the RICH photon detector modules with the MiniDAQ, the prototype of the upgraded LHCb readout architecture, has been reported. The development of the prototype of the RICH Upgrade Experiment Control System, integrating the DCS and DAQ partitions in a single FSM, has been described. The status of the development of the RICH Upgrade Inventory, Bookkeeping and Connectivity database has been reported as well. © CERN Geneva Access to files

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