Measurement Of W W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector
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Measurement Of W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Measurement Of W W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector
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Author : Veit Scharf
language : en
Publisher:
Release Date : 2014
Measurement Of W W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector written by Veit Scharf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Measurement Of W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector
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Author : Veit Lorenz Scharf
language : en
Publisher:
Release Date : 2014
Measurement Of W Gamma Gamma Production In Proton Proton Collisions And Limits On Anomalous Quartic Gauge Couplings Using The Atlas Detector written by Veit Lorenz Scharf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Bosons categories.
Hadron Collider Physics
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Author : Harry Weerts
language : en
Publisher: American Institute of Physics
Release Date : 2005-04-07
Hadron Collider Physics written by Harry Weerts and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-04-07 with Science categories.
East Lansing, Michigan, 14-18 June 2004
Measurement Of Di Photon Induced Production Of W Boson Pairs And Limits On Anomalous Quartic Gauge Couplings
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Author : Chav Chhiv Chau
language : en
Publisher:
Release Date : 2017
Measurement Of Di Photon Induced Production Of W Boson Pairs And Limits On Anomalous Quartic Gauge Couplings written by Chav Chhiv Chau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Extension of the Standard model can enhance the interactions between four vector bosons, so the couplings deviate from their predicted value due to new quartic-gauge-boson interactions. Searches for those deviations are model-independent and cover a wide range of possible new physics. This thesis describes the measurement of exclusive production of W-boson pairs and the search for WW\gamma\gamma anomalous quartic gauge couplings at the Large Hadron Collider (LHC) using a data set corresponding to 20.2 fb-1 of proton-proton collisions collected by the ATLAS detector in 2012. This analysis considers the W+W- decay modes leading to e\mu leptons. At the LHC, exclusive interactions are characterized by the absence of additional activity in the vicinity of interaction vertices. A technique based on tracks was developed to select the exclusive event candidates. The technique accepts approximately 60% of the signal, while eliminates most of the background due to suppression by 3--4 orders of magnitude. Additional background reduction is achieved by rejecting the region pT^{e\mu}
Measurement Of W Gamma And Z Gamma Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of W Gamma And Z Gamma Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A measurement of W-gamma and Z-gamma production in proton-proton collisions at sqrt(s) = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 inverse picobarns. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy>10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle>0.7, and with an additional dilepton invariant mass requirement of> 50 GeV for the Z-gamma process. The following cross section times branching fraction values are found: sigma(pp to W-gamma+X) B(W to lepton neutrino) = 56.3 +/- 5.0 (stat.) +/- 5.0 (syst.) +/- 2.3 (lumi.) pb and sigma(pp to Z-gamma+X) B}(Z to lepton lepton) = 9.4 +/- 1.0 (stat.) +/- 0.6 (syst.) +/- 0.4 (lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at sqrt(s) = 7 TeV are set.
Measurement Of The Z Gamma Production Cross Section In Pp Collisions At 8 Tev And Search For Anomalous Triple Gauge Boson Couplings
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Z Gamma Production Cross Section In Pp Collisions At 8 Tev And Search For Anomalous Triple Gauge Boson Couplings written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The cross section for the production of Z[gamma] in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb−1. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZ[gamma] and Z[gamma][gamma] are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.
A Search For Ww Gamma And Wz Gamma Triboson Production And Anomalous Quartic Gauge Couplings At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
A Search For Ww Gamma And Wz Gamma Triboson Production And Anomalous Quartic Gauge Couplings At Sqrt S written by 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.
An analysis probing for the standard model production of three electroweak vector bosons, WV$\gamma$ with V = W or Z gauge boson, is presented. The W boson decays leptonically to an electron or muon, or their respective antiparticle, paired with the appropriate neutrino. The second boson V decays hadronically into two jets, and additionally a photon is required in the event. The data analyzed correspond to an integrated luminosity of 19.6~fb$^{-1}$ and 2.3~fb$^{-1}$ from proton-proton collisions at $\sqrt{s}$ = 8~TeV and 13~TeV, respectively, collected in 2012 and 2015 by the CMS detector at the Large Hadron Collider. The event selection criteria used in these analyses yields 322 and 46 observed events in data in 2012 and 2015, respectively, while the estimated background yield from theoretical predictions is 342.1~$\pm$~22.2 and 54.3~$\pm$~17.7. These observations are consistent with the standard model next-to-leading order QCD predictions. Given the limitation in statistics to measure the cross section for this production process, an upper limit of 3.4 times the standard model predictions is made at a 95\% confidence level for WV$\gamma$ with photon $p_{T}$ greater than 30~GeV and absolute pseudorapidity less than 1.44. Physics beyond the standard model, such as anomalous couplings between the gauge bosons at the quartic vertex, may lead to enhancement in the number of WV$\gamma$ events produced within high energy collisions. Such enhancements can be observed in kinematic distributions, particularly in the higher energy regions. No evidence of anomalous WW$\gamma\gamma$ and WWZ$\gamma$ quartic gauge boson couplings is found, while 95\% confidence level upper limits are obtained for various couplings.
A Search For Ww Gamma And Wz Gamma Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
A Search For Ww Gamma And Wz Gamma Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Evidence For Exclusive Gamma Gamma To W W Production And Constraints On Anomalous Quartic Gauge Couplings At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Evidence For Exclusive Gamma Gamma To W W Production And Constraints On Anomalous Quartic Gauge Couplings At Sqrt S written by 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.
A search for exclusive or quasi-exclusive gamma-gamma to W+W- production, via pp to p(*) W+W- p(*) to p(*) mu+/- e-/+ at sqrt(s)=8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 inverse femtobarns. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pt(mu+/- e-/+>) 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 inverse femtobarns of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 +/- 0.6 (0.84 +/-0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4 sigma over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive gamma-gamma to W+W- production. Upper limits on the anomalous quartic gauge coupling operators a[W;0,C] (dimension-6) and f[M0,1,2,3] (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.