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Search For Bs And B To Dimuon Decays In Pp Collisions At 7 Tev
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Book Synopsis Search for B(s) and B to Dimuon Decays in Pp Collisions at 7 TeV. by :
Download or read book Search for B(s) and B to Dimuon Decays in Pp Collisions at 7 TeV. written by and published by . This book was released on 2011 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the rare decays B(s) to dimuons and B0 to dimuons is performed in pp collisions at sqrt(s)=7 TeV, with a data sample corresponding to an integrated luminosity of 1.14 inverse femtobarns, collected by the CMS experiment at the LHC. In both cases, the number of events observed after all selection requirements is consistent with expectations from background and standard-model signal predictions. The resulting upper limits on the branching fractions are B(B(s) to mu+̂ mu-̂)
Book Synopsis A Search for Z' Bosons in the Dimuon Decay Channel in 8 TeV Proton-proton Collisions by :
Download or read book A Search for Z' Bosons in the Dimuon Decay Channel in 8 TeV Proton-proton Collisions written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of the Rare Decays of $B^0_s$ and $B^0$ Into Muon Pairs from Data Collected During the LHC Run 1 with the ATLAS Detector by :
Download or read book Study of the Rare Decays of $B^0_s$ and $B^0$ Into Muon Pairs from Data Collected During the LHC Run 1 with the ATLAS Detector written by and published by . This book was released on 2016 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, a study of the decays B0s 2![mu]+[mu]- and B0 2![mu]+[mu]- has been performed using data corresponding to an integrated luminosity of 25 fb-1 of 7 and 8 TeV proton-proton collisions collected with the ATLAS detector during the LHC Run 1. For the B0 dimuon decay, an upper limit on the branching fraction is set at B(B0 2![mu]+[mu]- )
Book Synopsis Particle Polarization in High Energy Physics by : Pietro Faccioli
Download or read book Particle Polarization in High Energy Physics written by Pietro Faccioli and published by Springer Nature. This book was released on 2023-01-17 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open-access book addresses the following questions: how does the polarization of a particle, i.e., the angular momentum state in which it is produced, manifest itself in nature? What are the concepts and tools needed to perform rigorous measurements providing complete and unambiguous physical information? Polarization measurements are important because they reflect the nature and coupling properties of a particle and provide unique insights into the underlying fundamental interactions, playing a central role in the study and understanding of the mechanisms of particle production. Besides gradually reviewing many fundamental notions, the book presents several case studies relevant to physics analyses underway at the LHC, including the lepton-antilepton decays of vector states (Drell–Yan, Z and W bosons, quarkonia, etc.). The book also offers a detailed discussion of cascade decays, where the vector particle is a daughter of another particle, as well as a survey of typical angular distributions of particles of any integer or half-integer spin. With a visual approach to the presentation of the concepts and frequent use of pedagogical examples, taken from real measurements, gedankenexperiments, or detailed simulations, the book focuses on aspects of polarization measurements that are sometimes underestimated or left unexplored in experimental analyses, such as the importance of the choice of the reference frame, the existence of frame-independent relations, and the shapes of the physically allowed parameter domains. Several examples are provided of pitfalls introduced when the intrinsic multidimensionality of the problem is neglected in exchange for a simplified analysis. Targeting an audience of graduate students, post-docs, and other researchers involved in analyses of LHC data, this book helps to establish a solid bridge between high precision data, existing or soon to be collected, and accurate measurements, including high-sensitivity tests of the Standard Model.
Book Synopsis Search for Rare Decays of the B Meson at 1.8 TeV Pp̄ Collisions at CDF by : Carol E. Anway-Wiese
Download or read book Search for Rare Decays of the B Meson at 1.8 TeV Pp̄ Collisions at CDF written by Carol E. Anway-Wiese and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Particles Decaying to Diject in 7 TeV Proton-proton Collisions at CMS. by :
Download or read book Search for New Particles Decaying to Diject in 7 TeV Proton-proton Collisions at CMS. written by and published by . This book was released on 2011 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the dijet invariant mass spectrum and search for new particles decaying to dijets at CMS in 7 TeV pp collisions using data corresponding to an integrated luminosity of 2.875 pb-1. The measured dijet mass distribution is compared to QCD prediction from PYTHIA . It is required the pseudorapidity separation of the two jets to satisfy.
Book Synopsis Search for a W' Boson Decaying to a Muon and a Neutrino in Pp Collisions at Sqrt(s) by :
Download or read book Search for a W' Boson Decaying to a Muon and a Neutrino in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new heavy gauge boson, W', decaying to a muon and a neutrino, is searched for in pp collisions at a centre-of-mass of 7 TeV. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 36 inverse picobarns. No significant excess of events above the standard model expectation is found in the transverse mass distribution of the muon-neutrino system. Masses below 1.40 TeV are excluded at the 95% confidence level for a sequential standard-model-like W'. The W' mass lower limit increases to 1.58 TeV when the present analysis is combined with the CMS result for the electron channel.
Book Synopsis Search for Bs --] Mu+mu- and Bd --] Mu+mu- Decays with 2fb-1 of Ppbar Collisions by :
Download or read book Search for Bs --] Mu+mu- and Bd --] Mu+mu- Decays with 2fb-1 of Ppbar Collisions written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have performed a search for B{sub s}° →??− and B° →?+?− decays in p{bar p} collisions at √s = 1.96 TeV using 2 fb−1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of B{sub s}° and B° candidates is consistent with background expectations. The resulting upper limits on the branching fractions are?(B{sub s}° →?+?−)
Book Synopsis Search for Bs, D -] Mu Mu− Decays with 10/FB of Pp̄ Collisions by : Walter Hopkins
Download or read book Search for Bs, D -] Mu Mu− Decays with 10/FB of Pp̄ Collisions written by Walter Hopkins and published by . This book was released on 2013 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the rare decays of B0 [RIGHTWARDS ARROW] [MICRO SIGN]+ [MICRO SIGN][-] and B0 [RIGHTWARDS ARROW] [MICRO SIGN]+ [MICRO SIGN][-] is presented in p p collis d [SQUARE ROOT] sions at s=1.96 TeV corresponding to 10 fb[-]1 of integrated luminosity collected by the CDF II detector. The observed number of B0 candidates is consistent with d background-only expectations and yields an upper limit on the branching fraction B(B0 [RIGHTWARDS ARROW] [MICRO SIGN]+ [MICRO SIGN][-]) of 4.2 x 10[-]9 at 95% confidence level. An excess is observed d for the B0 signal region. The probability that background processes alone could s produce such an excess or larger is 0.94%. The probability that the combination of background and the expected standard model rate B0 [RIGHTWARDS ARROW] [MICRO SIGN]+ [MICRO SIGN][-] could produce s such an excess or larger is 6.8%. These data are used to determine a central value of B(B0 [RIGHTWARDS ARROW] [MICRO SIGN]+ [MICRO SIGN][-]) = (1.3+0.9) x 10[-]8 as well as a two sided limit at 90% C.L. s [-]0 7 of 2.2 x 10[-]9
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-12 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS by : Weifeng Ji
Download or read book Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS written by Weifeng Ji and published by . This book was released on 2018 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, I present the searches looking for decays of stopped massive long-lived exotic particles, which are pair produced in the proton-proton collisions at 13 TeV and come to rest afterwards in the CMS detector at the CERN LHC. The decays are most likely to be observed when there are no collisions. Two specific decay scenarios are studied: a long-lived particle (LLP) decaying hadronically or semi- leptonically in the calorimeter, and a LLP decaying semi-leptonically or leptonically to a pair of muons in the muon detector. The calorimeter-based search is performed using 2.7 fb-1 of 13 TeV collision run data collected in 2015 and 35.9 fb-1 of 13 TeV collision run data collected in 2016, corresponding to a total trigger livetime of 721 hours. The muon search is performed using 2.8 fb-1 of 13 TeV collision run data collected in 2015 and 36.2 fb-1 of 13 TeV collision run data collected in 2016, corresponding to a total trigger livetime of 744 hours. Search results are interpreted in a couple of simplified models. The limits on the production cross sections and masses of LLPs are calculated as a function of particle lifetimes, which vary from 100 ns to 10 days, assuming the corresponding decaying branching fractions to be 100%. The results are the most stringent ones on the stopped LLPs so far.
Book Synopsis Search for a Heavy Gauge Boson Decaying to a Charged Lepton and a Neutrino in 1 Fb-1 of pp Collisions at {u221A}s by :
Download or read book Search for a Heavy Gauge Boson Decaying to a Charged Lepton and a Neutrino in 1 Fb-1 of pp Collisions at {u221A}s written by and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS detector at the LHC is used to search for heavy charged gauge bosons (W'), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 1.04 fb−1. No excess beyond Standard Model expectations is observed. A W' with Sequential Standard Model couplings is excluded at the 95% confidence level for masses up to 2.15 TeV.
Book Synopsis Study of the B+c {u2192} J/?D+s and B+c{u2192} J/? D*+s Decays with the ATLAS Detector by :
Download or read book Study of the B+c {u2192} J/?D+s and B+c{u2192} J/? D*+s Decays with the ATLAS Detector written by and published by . This book was released on 2016 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the decays B+c → J/?D+s and B+c → J/? D*+s are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb–1 of pp collisions collected at centre-of-mass energies √s=7 TeV and 8 TeV, respectively. Signal candidates are identified through J/? → ?+?– and D(*)+s → ??+(?/?0) decays. With a two-dimensional likelihood fit involving the B+c reconstructed invariant mass and an angle between the ?+ and D+s candidate momenta in the muon pair rest frame, the yields of B+c → J/?D+s and B+c → J/? D*+s, and the transverse polarisation fraction in B+c → J/? D*+s decay are measured.
Book Synopsis Study of the B+c 2!J/[psi]D+s and B+c2!J/[psi] D*+s Decays with the ATLAS Detector by :
Download or read book Study of the B+c 2!J/[psi]D+s and B+c2!J/[psi] D*+s Decays with the ATLAS Detector written by and published by . This book was released on 2016 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the decays B+c → J/[psi]D+s and B+c → J/[psi] D*+s are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb-1 of pp collisions collected at centre-of-mass energies √s=7 TeV and 8 TeV, respectively. Signal candidates are identified through J/[psi] → [mu]+[mu]- and D(*)+s → [Phi][pi]+([gamma]/[pi]0) decays. With a two-dimensional likelihood fit involving the B+c reconstructed invariant mass and an angle between the [mu]+ and D+s candidate momenta in the muon pair rest frame, the yields of B+c → J/[psi]D+s and B+c → J/[psi] D*+s, and the transverse polarisation fraction in B+c → J/[psi] D*+s decay are measured.
Book Synopsis Particle Physics in the LHC Era by : Giles Barr
Download or read book Particle Physics in the LHC Era written by Giles Barr and published by Oxford University Press. This book was released on 2016-01-15 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text gives an introduction to particle physics at a level accessible to advanced undergraduate students. It is based on lectures given to 4th year physics students over a number of years, and reflects the feedback from the students. The aim is to explain the theoretical and experimental basis of the Standard Model (SM) of Particle Physics with the simplest mathematical treatment possible. All the experimental discoveries that led to the understanding of the SM relied on particle detectors and most of them required advanced particle accelerators. A unique feature of this book is that it gives a serious introduction to the fundamental accelerator and detector physics, which is currently only available in advanced graduate textbooks. The mathematical tools that are required such as group theory are covered in one chapter. A modern treatment of the Dirac equation is given in which the free particle Dirac equation is seen as being equivalent to the Lorentz transformation. The idea of generating the SM interactions from fundamental gauge symmetries is explained. The core of the book covers the SM. The tools developed are used to explain its theoretical basis and a clear discussion is given of the critical experimental evidence which underpins it. A thorough account is given of quark flavour and neutrino oscillations based on published experimental results, including some from running experiments. A simple introduction to the Higgs sector of the SM is given. This explains the key idea of how spontaneous symmetry breaking can generate particle masses without violating the underlying gauge symmetry. A key feature of this book is that it gives an accessible explanation of the discovery of the Higgs boson, including the advanced statistical techniques required. The final chapter gives an introduction to LHC physics beyond the standard model and the techniques used in searches for new physics. There is an outline of the shortcomings of the SM and a discussion of possible solutions and future experiments to resolve these outstanding questions. For updates, new results, useful links as well as corrections to errata in this book, please see the book website maintained by the authors: https://pplhcera.physics.ox.ac.uk/
Book Synopsis Suppression of Non-prompt J/psi, Prompt J/psi, and Y(1S) in PbPb Collisions at Sqrt(sNN) by :
Download or read book Suppression of Non-prompt J/psi, Prompt J/psi, and Y(1S) in PbPb Collisions at Sqrt(sNN) written by and published by . This book was released on 2012 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yields of prompt and non-prompt J/psi, as well as Y(1S) mesons, are measured by the CMS experiment via their dimuon decays in PbPb and pp collisions at sqrt(sNN) = 2.76 TeV for quarkonium rapidity.
Book Synopsis Study of the B+c 2!J/[Psi]D+s and B+c 2!J/[Psi]D*s+ Decays with the ATLAS Detector by :
Download or read book Study of the B+c 2!J/[Psi]D+s and B+c 2!J/[Psi]D*s+ Decays with the ATLAS Detector written by and published by . This book was released on 2016 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decays B+c → J/[Psi]D+s and B+c → J/[Psi]D*s+ are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb-1 of pp collisions collected at centre-of-mass energies √s = 7 TeV and 8 TeV, respectively. Furthermore, signal candidates are identified through J/[psi] → [mu]+[mu]- and D(*)+s → [Phi][pi]+([gamma]/[pi]0) decays.
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