Evidence For Exclusive Gamma Gamma To W W Production And Constraints On Anomalous Quartic Gauge Couplings At Sqrt S
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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.
A Search For Ww Gamma And Wz Gamma Triboson Production And Anomalous Quartic Gauge Couplings At Sqrt S
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language : en
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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.
Evidence For Exclusive U2192 W W U2013 Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Evidence For Exclusive U2192 W W U2013 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 2016 with categories.
A search for exclusive or quasi-exclusive ?? → W${̂+}$ W${̂–}$ production, via pp → p${̂(*)}$ W${̂+}$ W${̂–}$ p${̂(*)}$ → p${̂(*)}$ ?${̂±}$e${̂∓}$ p${̂(*)}$ at $ sqrt{s}=8 $ TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb${̂–1}$. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p$_{T}$(?${̂±}$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 fb${̂–1}$ 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? over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive ?? → W${̂+}$ W${̂–}$ production. Here, upper limits on the anomalous quartic gauge coupling operators a$_{0,C}{̂W}$ (dimension-6) and f$_{M0,1,2,3}$ (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.
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 Ow W Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2016
Evidence For Exclusive Ow W Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At 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.
Measurement Of The W W Production Cross Section And Search For Anomalous Ww Gamma And Wwz Couplings In P Bar P Collisions At Sqrt S
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Author :
language : en
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Release Date : 2009
Measurement Of The W W Production Cross Section And Search For Anomalous Ww Gamma And Wwz Couplings In P Bar P 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 2009 with categories.
This Letter describes the current most precise measurement of the W boson pair production cross section and most sensitive test of anomalous WW[gamma] and WWZ couplings in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The WW candidates are reconstructed from decays containing two charged leptons and two neutrinos, where the charged leptons are either electrons or muons. Using data collected by the CDF II detector from 3.6 fb−1 of integrated luminosity, a total of 654 candidate events are observed with an expected background contribution of 320 ± 47 events. The measured total cross section is [sigma](p{bar p} 2!WW− + X) = 12.1 ± 0.9 (stat){sub -1.4}{sup +1.6} (syst) pb, which is in good agreement with the standard model prediction. The same data sample is used to place constraints on anomalous WW[gamma] and WWZ couplings.
Limits On Anomalous Trilinear Gauge Couplings In Z Gamma Events From P Bar P Collisions At Sqrt S
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language : en
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Release Date : 2011
Limits On Anomalous Trilinear Gauge Couplings In Z Gamma Events From P Bar P 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.
Using Z[gamma] candidate events collected by the CDF detector at the Tevatron Collider, we search for potential anomalous (non-standard-model) couplings between the Z boson and the photon. At the hard scatter energies typical of the Tevatron, standard model Z[gamma] couplings are too weak to be detected by current experiments; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1 in the Z → [nu]{bar {nu}} decay channel and 5.1 fb−1 in the Z → l+l− (l = [mu], e) decay channels. The combination of these measurements provides the most stringent limits to date on Z[gamma] trilinear gauge couplings. Using an energy scale of [Lambda] = 1.5 TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Z[gamma] couplings to be
Search For Anomalous Quartic Ww Gamma Gamma Couplings In Dielectron And Missing Energy Final States In Ppbar Collisions At Sqrt S
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language : en
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Release Date : 2013
Search For Anomalous Quartic Ww Gamma Gamma Couplings In Dielectron And Missing Energy Final States In Ppbar 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 2013 with categories.
Measurement Of Electroweak Induced Production Of W Gamma With Two Jets In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2016
Measurement Of Electroweak Induced Production Of W Gamma With Two Jets 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 2016 with categories.
A measurement of electroweak-induced production of W gamma and two jets is performed, where the W boson decays leptonically. The data used in the analysis correspond to an integrated luminosity of 19.7 inverse femtobarns collected by the CMS experiment in sqrt(s)=8 TeV proton-proton collisions produced at the LHC. Candidate events are selected with exactly one muon or electron, missing transverse momentum, one photon, and two jets with large rapidity separation. An excess over the hypothesis of the standard model without electroweak production of W gamma with two jets is observed with a significance of 2.7 standard deviations, corresponding to an upper limit on the electroweak signal strength of 4.3 times the standard model expectation at 95% confidence level. The cross section measured in the fiducial region is 10.8 +/- 4.1 (stat) +/- 3.4 (syst) +/- 0.3 (lum) fb, which is consistent with the standard model electroweak prediction. The total cross section for W gamma in association with two jets in the same fiducial region is measured to be 23.2 +/- 4.3 (stat) +/- 1.7 (syst) +/- 0.6 (lum) fb, which is consistent with the standard model prediction from the combination of electroweak- and quantum chromodynamics-induced processes. No deviations are observed from the standard model predictions and experimental limits on anomalous quartic gauge couplings f[M,0-7]/\Lambda^4, f[T,0-2]/\Lambda^4, and f[T,5-7]/\Lambda^4 are set at 95% confidence level.
The Study Of Wgamma Production At D0
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language : en
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Release Date : 2007
The Study Of Wgamma Production At D0 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
W[gamma] production is analyzed in the electron and muon decay channels with approximately 1 fb−1 of data from p{bar p} collisions that were produced at a center-of-mass energy of √s = 1.96 TeV and that were collected by the D0 detector at the Fermilab Tevatron collider. The inclusive p{bar p} → l[nu][gamma] cross section is measured in both channels and is found to be consistent with the Standard Model expectation of 2.08 ± 0.05{sub PDF} pb for events with a photon E{sub T} > 11 GeV, [Delta]R{sub l{sub [gamma]}} > 0.7, and {ell}[nu][gamma] transverse mass greater than 90 GeV . The observed cross section is measured to be 2.05 ± 0.18{sub stat} ± 0.10{sub sys} ± 0.13{sub lumi} pb and a.72 ± 0.19{sub stat} ± 0.15{sub sys} ± 0.10{sub lumi} pb for the electron and muon channels respectively. The photon E{sub T} spectrum is examined for indications of anomalous WW{gamma} couplings. No evidence is found, and the following one-dimensional limits are set at a 95% confidence level: -0.18