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Showing 1 to 20 of 272 for “"Boson"”.
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Measurement of cross section times branching ratio for W boson + photon and Z boson + photon and search for anomalous W boson-photon and Z boson-photon couplings at 1.8 TeV
… search for anomalous couplings between the gauge bosons was also carried out using these results. Assuming only one anomalous coupling to be non-zero at a time, the 95% CL limits on $W\gamma$ anomalous couplings are, $-3.7 < \Delta\kappa\ < 3.7, -1.2 < \lambda < 1.2, -3.8 < \tilde\kappa < 3.8$ and …
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Exclusive search for Higgs boson to gamma-gamma decay via vector boson fusion production mechanism
We perform an exclusive search for the Higgs boson to gamma-gamma decay via vector boson fusion. We utilize the characteristic features of vector boson fusion, such as the di-jet [Delta][eta] and mass, as well as the di-photon [rho][tao], to search for the Higgs boson to gamma-gamma decay via the …
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Semiklassische Beschreibung des Spin-Boson-Modells
The spin coherent state path integral describing the dynamics of a <br>spin-1/2-system in a magnetic field of arbitrary <br>time-dependence is considered. Defining the path integral as the limit <br>of a Wiener regularized expression, the semiclassical approximation <br>leads to a continuous …
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The structure of paired boson superfluids
… considered, ordinary superfluids where single bosons condense to form a strongly correlated system and superfluids where pairs of bosons condense to form a strongly correlated system while the single bosons remain uncondensed. First, the classical minimum energy configuration for an ordinary …
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MICROSCOPIC ASPECTS OF THE INTERACTING BOSON MODEL.
As a phenomenological tool, the Interacting Boson Model (IBM) has been useful and successful in correlating a wide variety of experimental data regarding the collective properties of many nuclei. The original version of the IBM did not distinguish between protons and neutrons and is referred to as …
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Vector boson production with the ALICE detector
… and investigate the production of massive vector bosons (W+ and W−). This a priori mentioned production is not sensitive to hot nuclear matter effects because of the weak coupling nature of these vector bosons. Thus, in heavy ion collisions they provide a good reference for the medium-induced …
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First evidence for vector boson fusion produced Higgs boson in the WW* decay channel and search for extended Higgs sector
The discovery of a new boson state in 2012 shook the field of particle physics. The subsequent measurements of the properties of the newly found particle led to the conclusion that the particle is consistent the Standard Model Higgs boson within the uncertainty of the measurements. Individual …
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Measurement of Electroweak W Boson Production via Vector‐Boson Fusion in Proton–Proton Collisions at √s = 13 TeV with the CMS Detector
… measurement of the electroweak production of a W boson in association with two jets (pp → W jj) at √s = 13 TeV, using the full Run II dataset recorded by the CMS experiment at the CERN Large Hadron Collider (LHC), corresponding to an integrated luminosity of 138 fb−1. The process, characterised by …
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A measurement of W boson-photon and Z boson-photon cross sections in the muon channel in 1.8 TeV proton-antiproton collisions
… sensitive to anomalous couplings of the W and Z bosons. Using the $W\sb{\gamma}$ and $Z\sb{\gamma}$ absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous $WW\sb{\gamma}$, $ZZ\sb{\gamma}$ …
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Measurement of W Boson Polarization in Top Quark Decay
A measurement of the polarization of the W boson from top quark decay is an excellent test of the V-A form of the charged-current weak interaction in the standard model. Since the longitudinal W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives …
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New Aspects of Gauge-Boson Couplings and the Higgs Sector
… of new-physics effects in the gauge-boson sector are studied. In a form-factor approach to three-gauge-boson couplings at linear colliders in the process e+ e- ---> WW ---> 4 fermions the strongest possible bounds on the 28 parameters are determined by means of optimal observables. …
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Measurement of the W boson mass with the ALEPH detector
The W boson mass has been extracted using W-pairs decaying into evqq and mvqq final states. The events were selected from the data collected with the ALEPH detector during the years 1998, 1999 and 2000, corresponding to a total integrated luminosity of about 650 pb-1. A kinematic fit imposing …
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A measurement of the mass of the W vector boson from antiproton proton going to charged W boson going to muon muon neutrino at 1.8 TeV
… presents a measurement of the mass of the W boson using data collected during the 1992-93 collider run at the Fermilab Tevatron with the CDF detector. A fit to the transverse mass spectrum of a sample of 3268 $\rm W\to\mu\nu$ events from 19.7 $\rm pb\sp{-1}$ of data yields a mass of …
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Electroweak symmetry breaking in the era of the Higgs boson discovery
… (LHC). By using both measurements of the Higgs boson couplings, and limits on Higgs-like states at higher masses, we investigate whether the data support the possibility that the SM Higgs is mixed with another scalar. We consider fits to simplified models and we find that mixing angles with sin …
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Search for Higgs to invisible decays in vector boson fusion production
A search for invisibly decaying Higgs bosons is performed using the vector boson fusion production (VBF) mode. This search was conducted using Run 2 data, collected by the CMS detector at the LHC in 2016 at a center of mass energy of 13 TeV, corresponding to an integrated luminosity of 5.9 fb-1. …
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A Novel Statistical Procedure Towards the Discovery of the Higgs Boson
… hypothesized the existence of the Higgs Boson; a fundamental particle in the standard model of physics playing a crucial role in the understanding of the electroweak force. However, it took almost 50 years of technological advancements until its discovery was empirically announced in 2012 …
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SHEDDING LIGHT ON HIGGS BOSON SELF-INTERACTIONS IN THE BBƔƔ CHANNEL. PHOTON AND B-JET CALIBRATIONS, AND SEARCHES FOR HIGGS BOSON PAIRS WITH THE ATLAS EXPERIMENT.
… whose common theme is the study of the Higgs boson self-interactions through the search for Higgs boson pair production in the final state with two photons and two bottom quarks (bbγγ). The first analysis is a search for SM Higgs boson pairs (HH) in the bbγγ final state. No excess of events …
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Das Z^0-Boson und die Protonstrukturfunktion xF_3 in tiefinelastischer ep-Streuung
… kann die Propagatormasse des $Z^0$-Bosons zu $99^{+23 +7.5 +8.9 }_{-16 -29.7 -8.9}$ GeV und der schwache Mischungswinkel zu $sin^2 heta_W = 0.25^{+0.03 +0.026 +0.044}_{-0.025 -0.018 -0.044}$ bestimmt werden. Der Vergleich von Elektron- und Positron-Daten gestattet die Messung der …
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