High-Precision W-Boson Studies with LHCb
High-Precision W-Boson Studies with LHCb

Author: Ross Hunter

Publisher: Springer Nature

Published: 2024-01-02

Total Pages: 179

ISBN-13: 3031497031

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This book details a new and ground-breaking contribution to the search for a successor to the Standard Model (SM) of particle physics - the largest modern endeavour in the field. In the hope of seeing a discrepancy with the SM's predictions, this work discusses two hitherto unforeseen measurements at the frontier of experimental precision: a measurement of W-boson mass and a test of the fundamental axiom of the W boson's lepton flavour universality (LFU). Both measurements are made by analysing collision data from the LHCb experiment at the Large Hadron Collider (LHC) at CERN, and represent the establishment of a new field of high-precision Standard Model tests with LHCb. This book also describes the development of new software tools for the optimisation of the LHCb trigger system, which helps to ensure that LHCb's exciting physics program can continue to prosper into the future. This book is accessible to those with graduate—or master's—level training in experimental particle physics.

W Boson Mass Working Group Report
W Boson Mass Working Group Report

Author:

Publisher:

Published: 2010

Total Pages:

ISBN-13:

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The W boson mass working group discussed the current status of the W boson mass measurement and the prospects for improving on LEP and Tevatron measurements at the LHC.

Measuring Physical Properties of the W Boson in 7 TeV Proton-proton Collisions
Measuring Physical Properties of the W Boson in 7 TeV Proton-proton Collisions

Author: Phillip Killewald

Publisher:

Published: 2010

Total Pages: 144

ISBN-13:

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Abstract: The Large Hadron Collider (LHC) is a recently-activated proton-proton collider operating at a center-of-mass energy of 7 TeV. The Compact Muon Solenoid (CMS) is one of two general-purpose collider-detectors centered at one of the interaction points of the LHC. A measurement of the PW boson production cross-section and mass is presented to test the performance of the CMS detector in early (70 nb^-1) LHC data and to test theoretical predictions at this never-before-experienced energy regime. The cross-section measurement uses standard event counting techniques, while the mass measurement is performed using fitting of the analytical differential cross-section formula to the transverse mass spectrum from selected W to muon and muon neutrino events. The W production cross-section is measured to be [9,013 +/- 540 (stat.) +/- 552 (sys.) +/- 991 (lumi.)] pb, consistent with theoretical predictions at next-to-leading order in the strong coupling constant. The mass of the W is measured to be [80.07 +/- 0.64 (stat.) +/- 0.48 (sys.)] GeV/c^2, consistent with previous experimental measurements.

60 Years Of Cern Experiments And Discoveries
60 Years Of Cern Experiments And Discoveries

Author: Herwig Schopper

Publisher: World Scientific

Published: 2015-07-13

Total Pages: 452

ISBN-13: 9814644161

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The book is a compilation of the most important experimental results achieved during the past 60 years at CERN - from the mid-1950s to the latest discovery of the Higgs particle. Covering the results from the early accelerators at CERN to those most recent at the LHC, the contents provide an excellent review of the achievements of this outstanding laboratory. Not only presented is the impressive scientific progress achieved during the past six decades, but also demonstrated is the special way in which successful international collaboration exists at CERN.

An Improved W Boson Mass Measurement Using the Collider Detector at Fermilab
An Improved W Boson Mass Measurement Using the Collider Detector at Fermilab

Author:

Publisher:

Published: 2012

Total Pages: 238

ISBN-13:

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The mass of the W boson is one of the most important parameters in the Standard Model. A precise measurement of the W boson mass, together with a precise measurement of the top quark mass, can constrain the mass of the undiscovered Higgs boson within the Standard Model framework or give a hint for physics beyond the Standard Model. This dissertation describes a measurement of the W boson mass through its decay into a muon and a neutrino using ~ 2.2 fb-1 of √ s = 1.96 TeV p$\bar{p}$ data taken with the CDF II detector at Fermilab. We measure the W boson mass to be (80.374 ± 0.015stat. ± 0.016syst.) GeV/c2. This result, when combined with the W mass measurement in the electron channel, leads to the single most precise mW value and greatly constrains the possible mass range of the undiscovered Higgs boson. iv.

Measurements of Higgs Boson Properties in Proton-Proton Collisions at √s =7, 8 and 13 TeV at the CERN Large Hadron Collider
Measurements of Higgs Boson Properties in Proton-Proton Collisions at √s =7, 8 and 13 TeV at the CERN Large Hadron Collider

Author: Ulascan Sarica

Publisher: Springer Nature

Published: 2019-09-26

Total Pages: 103

ISBN-13: 3030254747

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This thesis documents the measurement of lifetime, width, mass, and couplings to two electroweak bosons of the recently-discovered Higgs boson using data from the CMS experiment at the Large Hadron Collider. Both on-shell (at the mass of around 125 GeV) and off-shell (above 200 GeV) Higgs boson production is studied and an excess of off-shell production with significance above two standard deviations is observed for the first time. The latter is a qualitative new way to study the Higgs field, responsible for generation of mass of all the known elementary particles. In addition, phenomenological tools have been developed with the Monte Carlo event generator and matrix element techniques for an optional analysis of LHC data. Optimization of the CMS data with careful alignment of the silicon tracker is also presented.

Measuring the Mass of the W at the LHC.
Measuring the Mass of the W at the LHC.

Author:

Publisher:

Published: 1997

Total Pages: 5

ISBN-13:

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We explore the ability of the Large Hadron Collider to measure the mass of the W boson. We believe that a precision better than (approximately) 15 MeV could be attained, based on a year of operation at low luminosity (1033 cm−2 s−1). If this is true, this measurement will be the world's best determination of the W mass. We feel this interesting opportunity warrants investigation in more detail. 10 refs., 2 figs.