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Spin Correlations In Tt Events From Pp Collisions
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Book Synopsis Spin Correlations in Tt Events from Pp Collisions by : Boris Lemmer
Download or read book Spin Correlations in Tt Events from Pp Collisions written by Boris Lemmer and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.
Book Synopsis Spin Correlations in tt Events from pp Collisions by : Boris Lemmer
Download or read book Spin Correlations in tt Events from pp Collisions written by Boris Lemmer and published by Springer. This book was released on 2015-06-24 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.
Book Synopsis Measurement of Spin Correlations in Tt̄ Events from Pp Collisions at √(s) by : Boris Lemmer
Download or read book Measurement of Spin Correlations in Tt̄ Events from Pp Collisions at √(s) written by Boris Lemmer and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Spin Correlations in Top/Anti-Top Events from Pp Collisions at Sqrt(s) by :
Download or read book Measurement of Spin Correlations in Top/Anti-Top Events from Pp Collisions at Sqrt(s) written by and published by . This book was released on 2014 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark decays before it hadronises. Before its spin state can be changed in a process of strong interaction, it is directly transferred to the top quark decay products. The top quark spin can be deduced by studying angular distributions of the decay products. The Standard Model predicts the top/anti-top quark (tt) pairs to have correlated spins. The degree is sensitive to the spin and the production mechanisms of the top quark. Measuring the spin correlation allows to test the predictions. New physics e ects can be reflected in deviations from the prediction. In this thesis the spin ...
Book Synopsis Measurements of Tt{u00AF} Spin Correlations and Top Quark Polarization Using Dilepton Final States in Pp Collisions at S by :
Download or read book Measurements of Tt{u00AF} Spin Correlations and Top Quark Polarization Using Dilepton Final States in Pp Collisions at S written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We presented measurements of the top quark-antiquark (tt¯) spin correlations and the top quark polarization for tt¯ pairs produced in pp collisions at √s=8 TeV. The data correspond to an integrated luminosity of 19.5 fb-1 collected with the CMS detector at the LHC. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The spin correlations and polarization are measured from the angular distributions of the two selected leptons, both inclusively and differentially, with respect to the invariant mass, rapidity, and transverse momentum of the tt¯ system. Moreover, the measurements are unfolded to the parton level and found to be in agreement with predictions of the standard model. A search for new physics in the form of anomalous top quark chromo moments is performed. Lastly, no evidence of new physics is observed, and exclusion limits on the real part of the chromo-magnetic dipole moment and the imaginary part of the chromo-electric dipole moment are evaluated.
Book Synopsis Measurement of Spin Correlations in T-tbar Production Using the Matrix Element Method in the Muon+jets Final State in Pp Collisions at {u221A}(s) by :
Download or read book Measurement of Spin Correlations in T-tbar Production Using the Matrix Element Method in the Muon+jets Final State in Pp Collisions at {u221A}(s) written by and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. We then compare the data with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Furthermore, by using a template fit method, the fraction of events that show SM spin correlations is measured to be 0.72 ±0.08 (stat)+0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton+jets final state to date.
Book Synopsis Heavy Particles And Flavours - Proceedings Of Lishep 2018 by : Santoro Alberto
Download or read book Heavy Particles And Flavours - Proceedings Of Lishep 2018 written by Santoro Alberto and published by World Scientific. This book was released on 2019-07-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book of proceedings is composed of articles based on the presentations at LISHEP 2018, centering on the main theme of the conference 'Heavy Particles and Flavours', with a focus on recent results and developments from the experiments at the Large Hadron Collider.
Book Synopsis Evidence for Spin Correlation in Tt Production by :
Download or read book Evidence for Spin Correlation in Tt Production written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the ratio of events with correlated t and t spins to the total number of tt events. This ratio f is evaluated using a matrix-element-based approach in 729 tt candidate events with a single lepton l (electron or muon) and at least four jets. The analyzed pp collisions data correspond to an integrated luminosity of 5.3 fb-1 and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy \(\sqrt{s}=1.96\) TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in tt events with a significance of more than 3 standard deviations.
Book Synopsis Measurements of $t\bar{t}$ Spin Correlations and Top-quark Polarization Using Dilepton Final States in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurements of $t\bar{t}$ Spin Correlations and Top-quark Polarization Using Dilepton Final States in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2013 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of T ̄t Spin Correlations and Top Quark Polarization Using Dilepton Final States in Pp Collisions at √s by : CMS Collaboration
Download or read book Measurements of T ̄t Spin Correlations and Top Quark Polarization Using Dilepton Final States in Pp Collisions at √s written by CMS Collaboration and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hadron Collider Physics 2005 by : Mario Campanelli
Download or read book Hadron Collider Physics 2005 written by Mario Campanelli and published by Springer Science & Business Media. This book was released on 2007-08-17 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of The Hadron Collider Physics Symposia (HCP) 2005, and reviews the state-of-the-art in the key physics directions of experimental hadron collider research. Topics include QCD physics, precision electroweak physics, c-, b-, and t-quark physics, physics beyond the Standard Model, and heavy ion physics. The present volume serves as a reference for everyone working in the field of accelerator-based high-energy physics.
Author :American Physical Society. Division of Particles and Fields. Meeting Publisher : ISBN 13 : Total Pages :976 pages Book Rating :4.:/5 (318 download)
Book Synopsis The Division of Particles and Fields of the American Physical Society by : American Physical Society. Division of Particles and Fields. Meeting
Download or read book The Division of Particles and Fields of the American Physical Society written by American Physical Society. Division of Particles and Fields. Meeting and published by . This book was released on 2001 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards Global Interpretation of LHC Data by : Toni Mäkelä
Download or read book Towards Global Interpretation of LHC Data written by Toni Mäkelä and published by Springer Nature. This book was released on 2023-05-16 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the first global interpretation of measurements of jet and top quark production at the Large Hadron Collider, including a simultaneous extraction of the standard model parameters together with constraints on new physics, unbiased from the assumptions on the standard model parameters. As a long-standing problem, any hadron collider search for new physics depends on parton distribution functions, which cannot be predicted but are extracted experimentally. However, performing the extraction in the same kinematic region where physics beyond the standard model is expected to manifest causes the risk of absorbing the new physics effects into the parton distributions. In this book, the issue is addressed by extending the standard model by effective contributions from quark contact interactions describing new physics and extracting the parton distributions and standard model parameters simultaneously with setting limits on the contact interactions. In the process, the most precise single measurement of the strong coupling constant at the LHC is performed, to date. Furthermore, the book details the first investigation of the mass renormalization scale dependence of the top quark mass, highlighting the importance of a proper scale choice for obtaining robust predictions and improving the precision of experimental analyses. The initial chapters provide the reader with a succinct yet accessible introduction to the relevant theoretical and experimental topics. The presented investigations are at the edge of precision in the phenomenology of high-energy physics and serve to pave the road toward a global interpretation of LHC data.
Book Synopsis Fundamental Interactions by : A. Astbury
Download or read book Fundamental Interactions written by A. Astbury and published by World Scientific. This book was released on 2003 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lake Louise Winter Institute is held annually to explore recent trends in high energy physics in an informal setting. Pedagogical and review lectures are presented by invited experts. A topical workshop is held in conjunction with the Institute, with presentations by participants. Contents: Study of Charmed Particles Production and Decay in Neutrino Interactions (E Barbuto); Measurement of Triple Gauge-Boson Couplings in ALEPH (R Bruneliere); Recent Studies on Sparticles and MSSM Higgses at CMS (M Chiorboli); Measurement of Single Z Production at LEP2 (I Fleck); Open Heavy Flavour Production at HERA (J Kroseberg); Quantum Electrodynamics in Strong Magnetic Fields (D A Leahy); Spectroscopy of Baryons Containing Two Heavy Quarks (D U Matrasulov); Fermion Pair Production at LEPII and Limits on New Physics Processes (A J M Muijs); Recent Results on Jet Fragmentation from CDF (A N Safonov); Single Spin Azimuthal Asymmetries in Semi-Inclusive Electroproduction of Pions and Kaons (R-C Seidl); and other papers.,Readership: Graduate students, academics and researchers in high energy and theoretical physics.
Book Synopsis Proceedings of the 31st International Conference on High Energy Physics ICHEP 2002 by : S. Bentvelsen
Download or read book Proceedings of the 31st International Conference on High Energy Physics ICHEP 2002 written by S. Bentvelsen and published by Elsevier. This book was released on 2012-12-02 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first precision measurements on CP violation in the B system are reported. Both the BELLE and the BABAR collaboration presented, among others, results for sin 2ß with much improved accuracy. Results from the Sudbury Neutrino Observatory, SNO, also deserve to be mentioned. The convincing evidence of solar neutrino oscillations had been presented by SNO prior to the conference; a full presentation was given at the conference. An incredibly precise measurement of the anomalous magnetic moment of the muon is reported, a fresh result from the Brookhaven National Laboratory. Apart from these distinct physics highlights, there are also the first results from the new Tevatron run and from the relativistic heavy ion collider RHIC. Theorists write of our ever better understanding of the Standard Model and of what might lie beyond. Risky as it is to highlight only a couple of exciting subjects, it is merely meantto whet the appetite for further reading.
Book Synopsis Hadronic Multiparticle Production by : Peter A. Carruthers
Download or read book Hadronic Multiparticle Production written by Peter A. Carruthers and published by World Scientific. This book was released on 1988 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt: http://www.worldscientific.com/worldscibooks/10.1142/0492
Book Synopsis Spin 96 - Proceedings Of The 12th International Symposium On High-energy Spin Physics by : J E J Oberski
Download or read book Spin 96 - Proceedings Of The 12th International Symposium On High-energy Spin Physics written by J E J Oberski and published by World Scientific. This book was released on 1997-04-15 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments using highly polarized intense beams and targets, and theoretical studies of spin and polarization phenomena, are now providing us with numerous additional details of the electroweak and strong interactions and the structure of matter. The spin structure of the nucleon has been measured over wide ranges of kinematic variables, and the cross sections have been calculated to several orders in perturbative field theory. At present, the influence of the higher twist contributions, the gluon spin, and the quark orbital angular momentum are under scrutiny. Quantum chromodynamics (QCD) captures a lot of our experimental knowledge of hard polarized scattering processes. Can our understanding of such processes within QCD be further improved?Hyperons produced in high energy reactions show how puzzling strong interactions between hadrons still are. Spin observables in experiments at intermediate energy are used to test parity and charge symmetries. Will they also reveal, at low energy, a violation of time reversal symmetry? We are on the verge of using parity violation measurements at intermediate electron scattering energies to determine the amount of strange quark contributions to the neutral weak form factor of the nucleon. The polarization of the sea quarks is expected to be measured soon in W± decays produced in high energy polarized proton interactions. Will the jets in polarized Z⁰ decays show a definite handedness? These and many other topics are discussed in these proceedings.
