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# Posters

Senast inlagda poster:
2019-08-09
15:35
Flavour Physics at the High Luminosity LHC : LHCb Upgrade II
 Reference: Poster-2019-700 Created: 2019. -1 p Creator(s): Marin Benito, Carla The LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1.5 x10^34 cm-2 s-1, and an integrated luminosity of at least 300fb-1. Modest consolidation of the current experiment will also be introduced in LS3 (2025). Physics goals include probing new physics scenarios in lepton flavour universality, obtaining unprecedented precision on CKM tests, and expanding the LHCb programme into new measurement areas such as Higgs decays to charm. The detector design options include the introduction of timing information, with opportunities in vertexing and tracking, electromagnetic calorimetery, and hadron particle identification. Preliminary studies for the LHC suggest that the luminosity goals will be achievable. Following the issue of a physics case and accelerator note in 2018, the collaboration has been approved by the LHCC to proceed to the preparation of a TDR. © CERN Geneva Access to file

2019-08-09
15:30
Latest LHCb measurements of semileptonic b-hadron decays
 Reference: Poster-2019-699 Created: 2019. -1 p Creator(s): Maccolini, Serena Semileptonic b-hadron decays proceed via charged-current interactions and provide powerful probes for testing the Standard Model of particle physics and for for searching for New Physics effects. The large branching fractions, coupled with excellent particle identification capability and accurate reconstruction of decay vertices, enable the LHCb experiment to perform high-precision measurements of many key quantities, such as CKM matrix elements, b-hadron properties, and Lepton Universality. In this contribution, recent results, essential for testing Lepton Universality and understanding hadronic effects, are presented. © CERN Geneva Access to files

2019-07-17
08:54
 Reference: Poster-2019-698 Created: 2019. -1 p Creator(s): Denysenko, Vadym; Esen, Sevda The LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1.5 x10^34 cm-2 s-1, and an integrated luminosity of at least 300fb-1. Modest consolidation of the current experiment will also be introduced in LS3 (2025). Physics goals include probing new physics scenarios in lepton flavour universality, obtaining unprecedented precision on CKM tests, and expanding the LHCb programme into new measurement areas such as Higgs decays to charm. The detector design options include the introduction of timing information, with opportunities in vertexing and tracking, electromagnetic calorimetery, and hadron particle identification. Preliminary studies for the LHC suggest that the luminosity goals will be achievable. Following the issue of a physics case and accelerator note in 2018, the collaboration has been approved by the LHCC to proceed to the preparation of a TDR. © CERN Geneva Access to file

2019-07-16
13:55
Particle identification performance of the LHCb experiment in Run 2
 Reference: Poster-2019-697 Created: 2019. -1 p Creator(s): Douglas, Lauren Marie; De Cian, Michel The LHCb particle identification (PID) system is composed of two ring-imaging Cherenkov detectors, a series of muon chambers and a calorimeter system. A novel strategy has been introduced in Run 2, where the selection of PID calibration samples for charged particles and neutrals is implemented in the LHCb software trigger. A further processing of the data is required in order to provide samples for the determination of PID performance, which is achieved through a centralised production that makes highly efficient use of computing resources. This talk covers the major steps of the implementation, and highlights the PID performance achieved in Run 2. © CERN Geneva Access to files

2019-07-16
10:51
Real-time alignment and temperature dependency of the LHCb Vertex Detector
 Reference: Poster-2019-696 Created: 2019. -1 p Creator(s): Mitreska, Biljana The accuracy of the LHCb Vertex Locator (VELO) has ensured excellent detector performance, with a track reconstruction efficiency above 98%, and a vertex resolution along the beam axis of about 70 microns. The real-time alignment and calibration procedure developed by the LHCb experiment for Run 2 (2015-2018) for the full detector, including the VELO, provided extremely stable conditions during the full data taking period. In 2010, a significant shrinkage of the VELO modules was observed at the operating temperature of -30 degrees with respect to survey measurements made at ambient temperature. This has been confirmed by laboratory measurements on a single module. In a recent study, using a dedicated LHCb data sample taken over a range of VELO temperatures, the variation of the detector position as a function of temperature has been evaluated. An overview of the VELO alignment procedure and its performance during Run 2 will be presented, with an emphasis on the study of the temperature dependence. © CERN Geneva Access to file

2019-06-27
14:45
LHCb - Recent results on the CKM angle $\gamma$ measurement at LHCb and prospect for Run III and Run IV
 Reference: Poster-2019-695 Created: 2019. -1 p Creator(s): Krupa, Wojciech The CKM angle γ is the least precise measured parameter of the Unitary Triangle. Discrepancies between precise measurements of the CKM angle γ in the tree-level and loop dominated processes might provide evidence of New Physics - beyond the Standard Model. The value can be well determined by exploiting the interference between favored 𝐵 → 𝐷𝐾 decay). Selected results of the Cabibbo-Kobayashi-Maskawa (CKM) angle γ measurements, with special attention for 𝐵 → 𝐷𝐾 decays family, obtained at the LCHb will be discussed. A quick overview of the upgrade of the LHCb spectrometer and prospect for future measurements during Run III and Run IV at LHC will be also presented. Related links:Conference LHCb Poster © CERN Geneva Access to file

2019-06-27
14:27
LHCb-Discovery of CP violation in charm decays at LHCb experiment and prospects for Run III and Run IV
 Reference: Poster-2019-694 Created: 2019. -1 p Creator(s): Ryzka, Jakub The existence of CP violation in the decays of strange and beauty mesons is very well established experimentally. On the contrary, CP violation in the decays of charmed particles has never been observed before (2018). During the LHC Run I and Run II the LHCb collaboration has collected a huge sample of charmed hadrons. This sample enables some of the most sensitive searches for CP violation ever performed. In this presentation, the results of the latest search for time-integrated CP violation in D0→K−K+ and D0→π−π+ decays, performed using the full data set collected by LHCb corresponding to an integrated luminosity of 9fb−1, will be discussed. The flavour of the decaying charm meson is determined by looking at the charge of the pion from the strong decay D∗(2010)+→D0π+ for promptly produced D0, or at the charge of the muon in semileptonic B0¯,B−→D0μ−ν¯μX decays for secondary production of D0. Also a brief prospects for further analyses (especially including Ξc barion decay) will be presented. Related links:Conference LHCb Poster © CERN Geneva Access to files

2019-05-28
16:31
CP-violation in B-meson decays
 Reference: Poster-2019-692 Keywords:  LHCb  CP violation  Charm Created: 2019. -1 p Creator(s): Pajero, Tommaso A measurement of the time-dependent $CP$ asymmetries in the decay of $D^{0}$ mesons into $K^{+}K^{-}$ and $\pi^{+}\pi^{-}$ final states, using the data collected by LHCb during 2015—2016, is presented. Its average with the LHCb Run 1 results is the most precise measurement of the $CP$ violation parameter $A_\Gamma$ to date. No evidence of $CP$ violation is found. Related links:Conference LHCb Poster © CERN Geneva Access to files
Time-dependent CP violation in $B^0_s$ decays at LHCb