Study Of Double Charm B Decays With The Lhcb Experiment At Cern And Track Reconstruction For The Lhcb Upgrade

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Study Of Double Charm B Decays With The Lhcb Experiment At Cern And Track Reconstruction For The Lhcb Upgrade

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Author : Renato Quagliani
language : en
Publisher: Springer
Release Date : 2018-11-04

Study Of Double Charm B Decays With The Lhcb Experiment At Cern And Track Reconstruction For The Lhcb Upgrade written by Renato Quagliani and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-04 with Science categories.

This book discusses the study of double charm B decays and the first observation of B0->D0D0Kst0 decay using Run I data from the LHCb experiment. It also describes in detail the upgrade for the Run III of the LHCb tracking system and the trigger and tracking strategy for the LHCb upgrade, as well as the development and performance studies of a novel standalone tracking algorithm for the scintillating fibre tracker that will be used for the LHCb upgrade. This algorithm alone allows the LHCb upgrade physics program to achieve incredibly high sensitivity to decays containing long-lived particles as final states as well as to boost the physics capabilities for the reconstruction of low momentum particles.

Studies Of Cp Violation In Charmless Three Body B Hadron Decays

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Author : Daniel O'Hanlon
language : en
Publisher: Springer
Release Date : 2018-11-02

Studies Of Cp Violation In Charmless Three Body B Hadron Decays written by Daniel O'Hanlon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-02 with Science categories.

This book highlights two essential analyses of data collected during the LHCb experiment, based on the Large Hadron Collider at CERN. The first comprises the first observation and studies of matter-antimatter asymmetries in two three-body b-baryon decays, paving the way for more precise measurements of the relatively unknown decay properties of b-baryon decays. The second is an analysis of a charged B meson decay to three charged pions, where previously large matter-antimatter asymmetries were observed in a model-independent analysis. Here a model of the decay amplitude is constructed using the unitarity-conserving ‘K-matrix’ model for the scalar contributions, so as to gain an understanding of how the previously observed matter-antimatter asymmetries arise; further, the model’s construction yields the most precise and comprehensive study of this decay mode to date.

First Observation Of Fully Reconstructed B0 And Bs0 Decays Into Final States Involving An Excited Neutral Charm Meson In Lhcb

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Author : Arnau Brossa Gonzalo
language : en
Publisher: Springer Nature
Release Date : 2023-01-31

First Observation Of Fully Reconstructed B0 And Bs0 Decays Into Final States Involving An Excited Neutral Charm Meson In Lhcb written by Arnau Brossa Gonzalo and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-31 with Science categories.

This book presents the latest results on the branching fraction and phase space distribution of B0 and Bs0 decays into final states including excited neutral charm mesons. This work represents four years of research, and the book describes in detail all the necessary steps and techniques required to perform a physics analysis of the data recorded by the LHCb experiment in the years 2016–2018. Although the results presented in this book represent the first measurement of such decays, the text is written in a manner accessible to Ph.D. students and early career researchers. Thus, all the contents included in this book are described in a pedagogical way, including technical details that would allow the results to be reproduced in future. In addition to the methodology used to perform these measurements, the book also includes a description of the theoretical background required to interpret the results presented, as well as a technical description of the LHCb detector, which provided the data sample used in this study.

Searches For Cp Violation In Charmed Meson Decays

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Author : Hamish Gordon
language : en
Publisher: Springer
Release Date : 2014-06-07

Searches For Cp Violation In Charmed Meson Decays written by Hamish Gordon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-07 with Science categories.

Our current understanding of the fundamental building blocks of the Universe, summarised by the Standard Model of particle physics, is incomplete. For example, it fails to explain why we do not see equal, or almost equal, numbers of particles and their antiparticle partners. To explain this asymmetry requires, among other effects, a mechanism known as charge-parity (CP) violation that causes differences between the rates at which particles and antiparticles decay. CP violation is seen in systems containing bottom and strange quarks, but not in those with up, charm or top quarks. This thesis describes searches for particle-antiparticle asymmetries in the decay rates of charmed mesons. No evidence of CP violation is found. With current sensitivities, an asymmetry large enough to observe probably could not be explained by the Standard Model. Instead an explanation could come from new physics, for example contributions from supersymmetric or other undiscovered heavy particles. In the thesis, the development of new techniques to search for these asymmetries is described. They are applied to data from the LHCb experiment at CERN to make precise measurements of asymmetries in the D^+->K^-K^+pi^+ decay channel. This is the most promising charged D decay for CP violation searches.

Observation Of Cp Violation In B Dk Decays

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Author : Paolo Gandini
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-09-05

Observation Of Cp Violation In B Dk Decays written by Paolo Gandini and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-05 with Science categories.

CP violation is a well-established phenomenon in particle physics, but until 2001 it was only observed in kaons. In the last decade, several matter-antimatter asymmetries have been observed in neutral B mesons in line with the expectations of the Standard Model of the weak interaction. Direct CP violation is also expected in the decay rates of charged B+ mesons versus that of B- mesons, though the greatest effects are present in a decay that occurs just twice in 10 million decays. Such rarity requires huge samples to study and this is exactly what the LHC, and its dedicated B-physics experiment LHCb provide. This thesis presents an analysis of the first two years of LHCb data. The author describes the first observation of the rare decay, B- → DK-, D → π-K+ and the first observation of direct CP violation in this B decay. The work constitutes essential information on the experiment’s measurement of a fundamental parameter of the theory and stands as a benchmark against which subsequent analyses of this type will be compared.

Track Reconstruction Efficiency And Analysis Of B K At The Lhcb Experiment

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Author : Michel De Cian
language : en
Publisher:
Release Date : 2013

Track Reconstruction Efficiency And Analysis Of B K At The Lhcb Experiment written by Michel De Cian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Study Of B Hadron Decays Into Two Hadrons And A Photon At Lhcb And First Observation Of B Baryon Radiative Decays

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Author : Vicente José Rives Molina
language : en
Publisher:
Release Date : 2016

Study Of B Hadron Decays Into Two Hadrons And A Photon At Lhcb And First Observation Of B Baryon Radiative Decays written by Vicente José Rives Molina and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

"This thesis is divided in different sections. After a short introduction about the thesis contents, the theory chapter presents the Standard Model of Particle Physics (SM), with an emphasis on those properties of flavour physics, such as oscillations. In this chapter a brief comment on radiative decays, the main topic through the thesis, is given, to present the specific theoretical description of these processes. The European Centre of Nuclear Research (CERN) is introduced in the second chapter, where the nature of such organization and the different experiments it holds are explained. Special emphasis is given for the LHCb experiment, which is the one that collected the data used in the analysis. The third chapter describes the monitorization and re-calibration of the SPD sub- detector, which is the one in charge of the discrimination between photons and other electromagnetic particles. During the Run 1 (2011-2012), this sub-detector suffered from ageing due to the presence of radiation inside the LHCb cavern. This ageing led to a drop in the SPD cell efficiencies, which could imply a loss in the data quality. The SPD is key in the context of radiative decays due to the presence of photons in the radiative final states and due to the fact that the main sources of background for radiative decays are related to the mis-identification of other particles as photons. With the work presented in this thesis, the performance of the SPD sub-detector reached the same status than it did for the beginning of Run 1, which corresponds to an almost flat cell efficiency around 95%. This recovery in efficiencies was performed by applying a correction factor calculated through the study of cosmic ray data and collision data from 2015. The fourth chapter describes a software tool developed within the radiative decays context. This tool is aimed for a better description of the photon/neutral pion separation variable, which is built making use of the electromagnetic clusters that these particles leave in the LHCb electromagnetic calorimeter (ECAL). This tool builds a variable that separates between the two particles but discrepancies between the data and the simulation distributions are observed. Because of this, two additional tools were developed to improve the agreement between them. These tools trust that the separation variable can be binned in terms of the particle transverse momentum and pseudorapidity. The first of the tools, "efficiency table tool", assigns the efficiency for a certain 2-dimensional bin as a weight to the simulation sample, so the distribution is corrected and matches the one for data. The "resampling tool", however, creates a new variable from calibration histograms built from background- subtracted distributions, trusting all radiative decays to have a similar behaviour in the 2-dimensional bins. The two tools can also be applied to neutral pions selection. The main chapter of the thesis is related to the measurement of the ratio of branching fractions for Bs decaying into phi (which decays into two kaons) and a photon and Lambda_b, decay into a Lambda bayron (which decays into a kaon and a proton) and a photon with respect to the best controlled radiative decay, Bd decaying into a K* (which decays into a kaon and a pion) and a photon, as well as the measurement of the direct CP asymmetry for the Lambda_b and Bd decays. This analysis also implies the first observation of a b-baryon radiative decay and constitutes the best measurement of the observables presented above. The analysis is performed over the whole Run 1 LHCb dataset (3 inverse fb). Special care is applied to the Lambda_b decay since it had never been done before; taking into account the different resonances that may intervene (that cannot be distinguished since they overlap and interfere). A 2- dimensional binning (on the resonance mass and on the proton angle) is defined for the study of the efficiencies, as recommended by the theory approaches to this decay and trusting (and confirmed afterwards) the different resonance decays to give a similar efficiency for the offline selection for a given bin. The thesis concludes with an overview of the whole work presented, given the calculated results for the physical observables and comparing them to the previously measured ones in the LHCb"--TDX.

Track Reconstruction In The Lhcb Experiment

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Author : Rutger Mark Eijk
language : en
Publisher:
Release Date : 2002

Track Reconstruction In The Lhcb Experiment written by Rutger Mark Eijk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Fast Track Reconstruction For The High Level Trigger Of The Lhcb Experiment

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Author : Johannes Albrecht
language : en
Publisher:
Release Date : 2009

Fast Track Reconstruction For The High Level Trigger Of The Lhcb Experiment written by Johannes Albrecht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

A Study Of B K Decays With The Lhcb Experiment

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Author : A. G. Buckley
language : en
Publisher:
Release Date : 2006

A Study Of B K Decays With The Lhcb Experiment written by A. G. Buckley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.