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LHCb spectrometer alignment and verification of its performance using the decay B [sub d exp 0] → K*⁰ J/ψ


Salzmann, Christophe. LHCb spectrometer alignment and verification of its performance using the decay B [sub d exp 0] → K*⁰ J/ψ. 2012, University of Zurich, Faculty of Science.

Abstract

The LHCb detector is one of the four experiments located at the Large Hadron Collider at CERN close to Geneva and is dedicated to so-called B physics. A good vertex and momentum resolution is crucial to this experiment. Detector alignment is an essential ingredient for obtaining the best possible measurement precision of a detector. The internal and relative alignment of the LHCb tracking subdetectors is performed using a novel method based on a Kalman filter track model. Alignment tests for the subdetector Tracker Turicensis preformed on top of the global alignment, provided important information to improve the global alignment. Flavour changing neutral currents are suppressed in the Standard Model and there- fore offer the possibility to search for processes related to new physics. The angular distribution of the weak neutral current decay Bd → K ∗0 µ+ µ− could deviate from Standard Model predictions, since particles predicted by new physics model could en- ter the process on the loop level and alter the angular distribution. The method to extract the acceptance effects of the detector of the LHCb detector on the angular distribution of the decay is based on simulation. The agreement be- tween data and simulation is tested using the control channel Bd → K ∗0 J/ψ (J/ψ → µ + µ− ). The comparison is made for the 2010 and 2011 data samples and show a good agreement. Der LHCb Detektor ist eines von vier Experimenten am Large Hadron Collider am CERN nahe Genf.

Abstract

The LHCb detector is one of the four experiments located at the Large Hadron Collider at CERN close to Geneva and is dedicated to so-called B physics. A good vertex and momentum resolution is crucial to this experiment. Detector alignment is an essential ingredient for obtaining the best possible measurement precision of a detector. The internal and relative alignment of the LHCb tracking subdetectors is performed using a novel method based on a Kalman filter track model. Alignment tests for the subdetector Tracker Turicensis preformed on top of the global alignment, provided important information to improve the global alignment. Flavour changing neutral currents are suppressed in the Standard Model and there- fore offer the possibility to search for processes related to new physics. The angular distribution of the weak neutral current decay Bd → K ∗0 µ+ µ− could deviate from Standard Model predictions, since particles predicted by new physics model could en- ter the process on the loop level and alter the angular distribution. The method to extract the acceptance effects of the detector of the LHCb detector on the angular distribution of the decay is based on simulation. The agreement be- tween data and simulation is tested using the control channel Bd → K ∗0 J/ψ (J/ψ → µ + µ− ). The comparison is made for the 2010 and 2011 data samples and show a good agreement. Der LHCb Detektor ist eines von vier Experimenten am Large Hadron Collider am CERN nahe Genf.

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Additional indexing

Item Type:Dissertation (monographical)
Referees:Straumann Ulrich D, Steinkamp Olaf
Communities & Collections:UZH Dissertations
Dewey Decimal Classification:Unspecified
Language:English
Place of Publication:Zürich
Date:2012
Deposited On:16 Apr 2019 12:25
Last Modified:15 Apr 2021 15:00
Number of Pages:123
OA Status:Green

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