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Showing 1 to 20 of 160 for “"lepton"”.
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Event generation at lepton colliders
The Monte-Carlo simulation package APACIC++/AMEGIC++ is able to describe current and future electron-positron annihilation experiments, namely the LEP collider at CERN and the TESLA collider at DESY. APACIC++ is responsible for the complete generation of one event and AMEGIC++ deals with the exact …
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Studies of lepton and quark interactions
… for c and b quarks, but s quark as well. The leptonic decay constants of various (Qq̅) mesons together with their masses are predicted. The topponium states are also discussed.
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Testing Lepton Nonuniversality In Tau Neutrino Scattering
Recently hints of lepton flavor non-universality emerged in the BaBar and LHCb experiments. In this paper we propose tests of lepton universality in scattering. To parametrize the new physics we adopt an effective Lagrangian approach and consider the neutrino deep inelastic scattering processes tau …
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Lepton-Nucleus Constraints for Neutrino Interactions and Oscillations
… the charge-parity violating phase in the lepton sector and the possible existence of physics Beyond the Standard Model. To have an understanding of all the effects necessary for the success of these experiments, lepton-nucleus interactions must be modeled in unprecedented detail. With this …
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Polarisierte Photon- und geflavourte Lepton-Quantenboltzmanngleichungen im frühen Universum
Polarisation and Nongaussianity are expected to play a central role in future studies of the cosmic microwave background radiation. Polarisation can be split into a divergence-like E-mode and a curl-like B-mode, of which the later can only be induced by primordial gravitational waves (tensor …
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Field Theoretic Models of Deep Inelastic Lepton-Nucleon Scattering
<p>We investigate the asymptotic behavior of the inelastic electron-nucleon structure functions within the framework of ladder models of the virtual Compton amplitude in the limit |q<sup>2</sup>|→ ∞ with w=2q·p/|q<sup>2</sup>| large and fixed. (q is the electron four-momentum transfer and p the …
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Probing Lepton Flavour Universality With $\bz \to \kstarz \taup \taum$
… \tau \nu$ data has hinted at the violation of lepton flavour universality. Effective field theories which attempt to find an explanation for these anomalies predict sizeable enhancements to the rate of $\bquark \to \squark \taup \taum$ currents. We use $pp$ collision data collected by the LHCb …
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The contribution of two-photon exchange in elastic lepton-proton scattering
… exchange correction term entering into elastic lepton-proton scattering and existent empirical data is not sufficiently precise to settle the matter. OLYMPUS is one of several new experiments designed to evaluate R2[gamma], the ratio of the elastic cross sections for positron-proton and …
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Measuring the lepton sign asymmetry in elastic electron-proton scattering with OLYMPUS
… gaseous, hydrogen target, and the scattered lepton and recoiling proton were detected in coincidence using a large acceptance magnetic spectrometer. Determining the relative integrated luminosity between the electron and positron data sets was critical, and a new technique, involving …
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A Measurement of the Jet Multiplicity in Di-lepton Final States of ttbar Events
A measurement of the jet multiplicity in di-leptonically decaying ttbar events (i.e. ttbar → (ee, μμ, eμ) + missing transverse momentum + jets) is presented, using 4.66 fb -1 of data collected from √ s = 7 TeV pp collisions at the CERN Large Hadron Collider. In order to mitigate the effects of …
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Observation and examination of a Higgs boson in the ZZ to four lepton channel
… (SM) Higgs boson to two Z bosons to four charged leptons. We observe a single excess above background expectation with a significance of 7.4 standard deviations at a mass of 125.6 ±0.4(stat) ±0.2(syst) GeV. This excess has a signal strength parameter ... We examine the transverse momentum spectrum …
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Search for anomalous couplings in the decay of polarized Z bosons to tau lepton pairs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Study of the sensitivity of CMS to the lepton flavour violating neutrinoless tau decay tau mymymy
… its operation in summer 2009. The total tau lepton production cross-section for the CMS experiment, at a center-of-mass energy of 14 TeV, is about 140 µb. Assuming an integrated luminosity of 10 fb^-1 per year, which is expected to be reached in the low luminosity phase of L = 2*10^33 …
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Top quark mass measurement in the Lepton+Jets channel using full simulation of the CMS detector
… all events one of the top quarks decays into a lepton and neutrino while the other one decays into two light quarks (semileptonic decay chain). This channel therefore provides a good selection purity (lepton tagging) and the possibility for the complete reconstruction of the hadronically …
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Suppression of the fake lepton background in same-sign W-boson scattering with the ATLAS experiment
… Run 2. The two scattered W-bosons decay leptonically leaving a distinctive experimental signature of two same-sign leptons, two forward jets, and missing transverse energy carried away by two neutrinos. Non-prompt leptons are defined as leptons coming from the decay of hadrons. Such …
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A search for displaced lepton and track triggers at the ATLAS experiment at the Large Hadron Collider
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Direct Measurements of Two Photon Exchange on Lepton-Proton Elastic Scattering Using Simultaneous Electron-Positron Beams in CLAS
… with a recent measurement at the VEPP-3 lepton storage ring in Novosibirsk and with the hadronic calculation by Blunders, Melnitchouk and Tjon. The hadronic calculation resolves the disagreement between the Rosenbluth separation and polarization transfer extractions of <em>GE/GM</em> at …
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