نتایج جستجو برای: b quark
تعداد نتایج: 924777 فیلتر نتایج به سال:
Recent lattice studies of hadron properties, in particular of exotic states and charmonia are reviewed. Sea quark and quark mass effects are discussed as well as decays and mixing. PACS. 12.39.Mk Glueball and nonstandard multi-quark/gluon states – 14.40.Cs Mesons with S = C = 0 – 14.40.Gx Mesons with S = C = B = 0 – 12.38.Gc Lattice QCD calculations
The separation of b-quark initiated jets from those coming from lighter quark flavors (b-tagging) is a fundamental tool for the ATLAS physics program at the CERN Large Hadron Collider. The most powerful b-tagging algorithms combine information from low-level taggers, exploiting reconstructed track and vertex information, into machine learning classifiers. The potential of modern deep learning t...
Experimental results on c-and b-quark fragmentation are reviewed. The discussion is concentrated on measurements of heavy-quark fragmentation functions and fragmentation fractions. Measurements of various heavy-quark fragmentation ratios are also discussed. The experimental results are compared with theoretical expectations and model predictions.
The distributions of the bottom quark in process $e^+ e^- \to t \, \bar{t} b W^+ \bar{t}$ are considered at e^-$ energy corresponding to first construction stage Compact Linear Collider. cross sections \ldots$, as functions $b$-quark and angle with respect direction electron beam, derived calculated. effects physics beyond Standard Model included via modified $\gamma $Z couplings which naturall...
We describe possible scenarios of quark deconfinement in compact stars and we analyze their astrophysical implications. The quark deconfinement process can proceed rapidly, as a strong deflagration, releasing a huge amount of energy in a short time and generating an extra neutrino burst. If energy is transferred efficiently to the surface, like e.g. in the presence of convective instabilities, ...
We measured the ratios of electroproduction cross sections from a proton target for three exclusive meson-baryon final states: ΛK(+), pπ(0), and nπ(+), with the CLAS detector at Jefferson Lab. Using a simple model of quark hadronization, we extract qq creation probabilities for the first time in exclusive two-body production, in which only a single qq pair is created. We observe a sizable suppr...
We study reported deviations between observations and theoretical predictions associated with the production of a pair dileptonically decaying top quarks at LHC, we examine possibility that they reflect signal toponium formation. investigate by gluon fusion color-singlet spin-0 ${\ensuremath{\eta}}_{t}$ bound state antitop quark, then decays ($gg\ensuremath{\rightarrow}{\ensuremath{\eta}}_{t}\e...
We analyze the electromagnetic amplitude for the leptonic decays of pseudoscalar mesons in the quark model, with particular emphasis on η → l+l− (l = e, μ). We evaluate the electromagnetic box diagram for a quark-antiquark pair with an arbitrary distribution of relative three-momentum p: the amplitude is obtained to all orders in p/mq, where mq is the quark mass. We compute BP ≡ Γ(η → l+l−)/Γ(η...
This report summarizes the flavor tagging techniques developed at the CDF and DØ experiments. Flavor tagging involves identification of the B meson flavor at production, whether its constituent is a quark or an anti-quark. It is crucial for measuring the oscillation frequency of neutral B mesons, both in the B 0 and B 0 s system. The two experiments have developed their unique approaches to fla...
Using data collected during the 1992-1993 collider run at Fermilab, CDF has made measurements of correlated b quark cross section where one b is detected from the lepton from semileptonic decay and the second b is detected with secondary vertex techniques. We report on measurements of the cross section as a function of the momentum of the second b and as a function of the azimuthal separation o...
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