CKM Matrix; LHC; LHCb; CP violation; pp collisions; B meson; b quark; new physics; Standard Model
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Aaji R. et al. (704 other authors) (2015), Search for the lepton flavour violating decay τ−→μ−μ+μ−, in Journal of High Energy Physics
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Aaji R. et al. (700 other authors) (2014), Measurement of the forward W boson cross-section in pp collisions at √s=7 TeV, in Journal of High Energy Physics
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Aaji R. et al. (675 other authors) (2014), Observation of associated production of a Z boson with a D meson in the forward region, in Journal of High Energy Physics
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Aaji R. et al. (704 other authors) (2014), Observation of Z production in proton-lead collisions at LHCb, in Journal of High Energy Physics
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Elsasser Ch. (2014), The LHCb Silicon Tracker, in Journal of Instrumentation
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Elsasser Ch. (2014), The LHCb Silicon Tracker—Performance & radiation damage, in Nuclear Instruments and Methods
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Aaij R. et al. (632 other authors) (2013), Differential branching fraction and angular analysis of the decay B0→K∗0μ+μ−, in Journal of High Energy Physics
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Aaji R. et al. (656 other authors) (2013), Measurement of form-factor independent observables in the decay B0→K∗0μ+μ−, in Physical Review Letters
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Aaji R. et al. (654 other authors) (2013), Measurement of the B0s→μ+μ− branching fraction and search for B0→μ+μ− decays at the LHCb experiment, in Physical Review Letters
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Elsasser Ch. (2013), Rare Decays, in EPJ Web of Conferences
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Aaij R. et al. (631 other authors) (2013), Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb, in Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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Aaji R. et al. (680 other authors) (2013), Study of forward Z + jet production in pp collisions at √ s = 7 TeV, in Journal of High Energy Physics
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Elsasser Ch., LHCb Silicon Detectors: Operational Experience and Run I to Run II Transition, in Proceedings of Science
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V. Khachatryan et al. (2829 other authors), Observation of the rare B0s --> µ+ µ- decay from the combined analysis of CMS and LHCb data, in submitted to Nature
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The LHCb experiment  was designed to perform precision easurements of CP violation and rare decays of heavy quarks at the LHC. By measuring numerous decay modes of b and c hadrons, it performs consistency checks of the Standard Model of particle physics and searches for signs of physics beyond the Standard Model. Both the LHC and the LHCb experiment are looking back to two very successful years of operation. LHCb is routinely operating at twice its design instantaneous luminosity. About 1 fb??1 of good-quality data were collected in 2011. More than 1.4 fb??1 have already been accumulated in 2012 and about 2.2 fb??1 are expected by the end of the year. The data taking eciency is high. In 2011, more than 90% of the luminosity delivered by the LHC were recorded with good quality. This number has further improved to above 95% in 2012. Based on the analysis of data collected in 2010 and 2011, a total of 67 papers has already been submitted to journals, several more are in the pipeline. World-best measurements were achieved in many of LHCb s key analyses. Most results are limited by statistical uncertainties and signi cant improvements are expected from analyses of the combined 2011 and 2012 datasets, which are currently underway. More details on the status and performance of the LHCb experiment are given in Sec. 2. The Zurich group plays an important role in several physics analyses as well as in the operation of the detector. We made a leading contribution towards the design and construction of the LHCb Silicon Tracker (ST) and in particular of the Tracker Turicensis (TT), a large surface silicon microstrip detector upstream of the LHCb dipole magnet. We remain responsible for the maintenance and operation of this detector as well as for the calibration and quality of the data it delivers. The status of the ST and our role in its operation are described in Sec. 3. The precise understanding of the spatial alignment of the detector and of track reconstruction e-ciencies are crucial prerequisites for exploiting the physics potential of the detector and minimizing systematic uncertainties on the physics results. Our group has made signi cant contributions to the determination of these quantities, which are summarized in Sec. 4. In physics analyses, we have established ourselves as leading players in searches for New Physics in very rare decays and in B decays mediated by electroweak penguins, as well as in measurements of electroweak boson production in the forward region. These analyses and our contributions to them are described in Sec. 5, 6 and 7. Thanks to upgrades to the high-level trigger computer farm, which were in part made possible through a special grant from the Swiss National Science Foundation in 2011, LHCb is able to store data to disk at more than twice the originally foreseen rate. This enables the experiment to significantly expand its physics potential, but also puts additional strain on resources for oine computing. Our contributions to oine computing are briely summarized in Sec. 8. Plans for an upgrade of the LHCb detector during the long LHC shutdown foreseen for the years 2018/2019 are taking shape and have been well received by the community and the relevant committees at CERN. Several new groups have recently joined the collaboration with the intention to contribute to the upgrade. Our plans for participation in the LHCb upgrade are described in 9. In addition to our contributions to the physics and the operation of the experiment, members of our group have also taken on leading positions within the collaboration. Ulrich Straumann served as chair of the LHCb collaboration board from 2008 till 2012, Olaf Steinkamp has been a member of the LHCb Speakers Bureau since the beginning of 2011 and is chairing it in 2012.