CERN Accelerating science

LHCb Conference Proceedings

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TWO-PARTICLE CORRELATIONS AT THE LHCb∗ / Kucharczyk, Marcin (Polish Academy of Sciences (PL))
Due to its unique pseudorapidity coverage (2 < η < 5) and excellent performance, the LHCb detector allows the study of various aspects of par- ticle correlations at large rapidities and low transverse momenta. Selected results are summarized, such as the first measurement of the Bose–Einstein correlations of the same-sign pions and kinematic correlations for pairs of beauty hadrons performed using large samples of proton–proton collision data accumulated with the LHCb detector at $\sqrt{s}$ = 7 and 8 TeV, together with the long-range correlations on the near side measured in proton–lead and lead–proton collisions at a nucleon–nucleon centre-of-mass energy of $\sqrt{s}$ = 5 TeV. [...]
LHCb-PROC-2019-009; CERN-LHCb-PROC-2019-009.- Geneva : CERN, 2019 - 6. Fulltext: PDF;
In : Diffraction and Low-x 2018, Reggio Calabria, Italy, 26 Aug - 1 Sep 2018

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Soft QCD and Central Exclusive Production at LHCb / Kucharczyk, Marcin (Cracow, INP) /LHCb Collaboration
The LHCb detector, owing to its unique acceptance coverage $(2 < \eta < 5)$ and a precise track and vertex reconstruction, is a universal tool allowing the study of various aspects of electroweak and QCD processes, such as particle correlations or Central Exclusive Production. The recent results on the measurement of the inelastic cross section at $ \sqrt s = 13 \ \rm{TeV}$ as well as the Bose-Einstein correlations of same-sign pions and kinematic correlations for pairs of beauty hadrons performed using large samples of proton-proton collision data accumulated with the LHCb detector at $\sqrt s = 7\ \rm{and} \ 8 \ \rm{TeV}$, are summarized in the present proceedings, together with the studies of Central Exclusive Production at $ \sqrt s = 13 \ \rm{TeV}$ exploiting new forward shower counters installed upstream and downstream of the LHCb detector. [...]
LHCb-PROC-2019-008; CERN-LHCb-PROC-2019-008.- Geneva : CERN, 2019 - 6. - Published in : PoS DIS2019 (2019) 057 Fulltext: PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.57

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Tests of Lepton Flavour Universality at LHCb / Mueller, Katharina (Universitaet Zuerich (CH))
In the Standard Model of particle physics the three charged leptons are identical copies of each other, apart from mass differences, and the electroweak coupling of the gauge bosons to leptons is independent of the lepton flavour. This prediction is called lepton flavour universality (LFU) and is well tested. [...]
LHCb-PROC-2019-006; CERN-LHCb-PROC-2019-006.- Geneva : CERN, 2019 - mult.p.
In : Kruger2018, Hazyview, South Africa, 3 - 7 Dec 2018

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Mixing and time-dependent CP violation in beauty at LHCb / Govorkova, Katya (Nikhef National institute for subatomic physics (NL))
Recent measurements of the time-dependent CP violation are presented. The decays of $B_{s}^{0}$ mesons to $J/\psi\,K^+ K^-$ and $J/\psi\,\pi^+ \pi^-$ final states are used to measure CP-violating parameters with proton-proton collision data, corresponding to an integrated luminosity of 1.9 fb$^{-1}$, collected by the LHCb detector at a centre-of-mass energy of 13 TeV in 2015 and 2016 [...]
LHCb-PROC-2019-005; CERN-LHCb-PROC-2019-005.- Geneva : CERN, 2019 - mult.p. Fulltext: PDF;
In : 54th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 16 - 23 Mar 2019

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XYZ states at LHCb / Kucharczyk, Marcin (Polish Academy of Sciences (PL))
The latest years have observed a resurrection of interest in searches for exotic states motivated by precision spectroscopy studies of beauty and charm hadrons providing the observation of several exotic states. The latest results on spectroscopy of exotic hadrons are reviewed, using the proton-proton collision data collected by the LHCb experiment. [...]
LHCb-PROC-2019-004; CERN-LHCb-PROC-2019-004.- Geneva : CERN, 2019 - 6. Fulltext: PDF;
In : 15th International Workshop on Meson Physics, Kraków, Poland, 7 - 12 Jun 2018

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Mixing and indirect $CP$ violation in two-body Charm decays at LHCb / Pajero, Tommaso (Universita & INFN Pisa (IT))
The copious number of $D^0$ decays collected by the LHCb experiment during 2011--2016 allows the test of the violation of the $CP$ symmetry in the decay of charm quarks with unprecedented precision, approaching for the first time the expectations of the Standard Model. We present the latest measurements of LHCb of mixing and indirect $CP$ violation in the decay of $D^0$ mesons into two charged hadrons [...]
LHCb-PROC-2019-003; CERN-LHCb-PROC-2019-003.- Geneva : CERN, 2019 - 10. Fulltext: PDF;
In : 10th International Workshop on the CKM Unitarity Triangle, Heidelberg, Germany, 17 - 21 Sep 2018

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Experimental status of LNU in B decays in LHCb / Benson, Sean (Nikhef National institute for subatomic physics (NL))
In the Standard Model, the three charged leptons are identical copies of each other, apart from mass differences. Experimental tests of this feature in semileptonic decays of b-hadrons are highly sensitive to New Physics particles which preferentially couple to the 2nd and 3rd generations of leptons. [...]
LHCb-PROC-2019-002; CERN-LHCb-PROC-2019-002.- Geneva : CERN, 2019 - 7. Fulltext: PDF;
In : The 15th International Workshop on Tau Lepton Physics, Amsterdam, Netherlands, 24 - 28 Sep 2018

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Rare radiative decays at LHCb / Puig Navarro, Albert (Universitaet Zuerich (CH))
Radiative $b$-hadron decays are sensitive probes of New Physics through the study of branching fractions, $CP$ asymmetries and measurements of the polarization of the photon emitted in the decay. During Run I of the LHC, the LHCb experiment has collected large samples of radiative $b$-hadron decays. [...]
LHCb-PROC-2019-001; CERN-LHCb-PROC-2019-001.- Geneva : CERN, 2018-12-20 - 6. - Published in : CERN Conf.Proc. 1 (2018) 243 Fulltext: PDF;
In : Proceedings of the PHOTON-2017 Conference, pp.243

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Simultaneous usage of the LHCb HLT farm for Online and Offline processing workflows / Closier, Joel (CERN) ; Gaspar, Clara (CERN) ; Granado Cardoso, Luis (CERN) ; Haen, Christophe (CERN) ; Jost, Beat (CERN) ; Neufeld, Niko (CERN) /LHCb Collaboration
LHCb is one of the 4 LHC experiments and continues to revolutionise data acquisition and analysis techniques. Already two years ago the concepts of “online” and “offline” analysis were unified: the calibration and alignment processes take place automatically in real time and are used in the triggering process such that Online data are immediately available offline for physics analysis (Turbo analysis), the computing capacity of the HLT farm has been used simultaneously for different workflows : synchronous first level trigger, asynchronous second level trigger, and Monte-Carlo simulation. [...]
LHCb-PROC-2018-031; CERN-LHCb-PROC-2018-031.- Geneva : CERN, 2019 - 8 p. - Published in : EPJ Web Conf. 214 (2019) 01001 Fulltext from publisher: PDF; LHCb Note: PDF;
In : 23rd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2018, Sofia, Bulgaria, 9 - 13 Jul 2018, pp.01001

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The Timepix3 Telescope andSensor R&D for the LHCb VELO Upgrade / Dall'Occo, Elena (Nikhef National institute for subatomic physics (NL))
The VErtex LOcator (VELO) of the LHCb detector is going to be replaced in the context of a major upgrade of the experiment planned for 2019-2020. The upgraded VELO is a silicon pixel detector, designed to with stand a radiation dose up to $8 \times 10^{15} 1 ~\text {MeV} ~\eta_{eq} ~ \text{cm}^{−2}$, with the additional challenge of a highly non uniform radiation exposure. [...]
LHCb-PROC-2018-030; CERN-LHCb-PROC-2018-030.- Geneva : CERN, 2018 - 8.

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