نتایج جستجو برای: lambda baryon
تعداد نتایج: 35308 فیلتر نتایج به سال:
The yield for the multistrange Xi(-) hyperon has been measured in 6A GeV Au+Au collisions via reconstruction of its decay products pi(-) and Lambda, the latter also being reconstructed from its daughter tracks of pi(-) and p. The measurement is rather close to the threshold for Xi(-) production and therefore provides an important test of model predictions. The measured yield for Xi(-) and Lambd...
A new mechanism has been proposed to simultaneously explain the presence of dark matter and matter-antimatter asymmetry in universe. This scenario predicts exotic $B$ meson decays into a baryon sector anti-baryon ($\psi_D$) with branching fractions accessible at factories. We present search for $B \rightarrow \Lambda \psi_D$ using data collected by $BABAR$ experiment SLAC. reaction is identifie...
We study the baryon-baryon interactions with strangeness $S = -2$ and corresponding momentum correlation functions in leading order covariant chiral effective field theory. The relevant low energy constants are determined by fitting to latest HAL QCD simulations, taking into account all coupled channels. Extrapolating so-obtained strong physical point considering both quantum statistical effect...
The strong electronic absorption systems of the B1 Sigma u+-X1 Sigma g+ Lyman and the C1Pi u-X1 Sigma g+ Werner bands can be used to probe possible mass-variation effects on a cosmological time scale from spectra observed at high redshift, not only in H2 but also in the second most abundant hydrogen isotopomer HD. High resolution laboratory determination of the most prominent HD lines at extrem...
We present a systematic study of $\Lambda_c^+ \to {\cal B}_q \ell^+ \nu_\ell $ with ${\cal = (\Lambda, n)$ and $\ell =( e, \mu)$, examining all the possible decay observables based on homogeneous bag model (HBM) lattice QCD (LQCD). With HBM, we find that branching fractions polarization asymmetries daughter baryon $\Lambda$ are B}(\Lambda_c^+ \Lambda e^+ \nu_e, \mu^+ \nu_\mu, n \ell ^+ ) (3.78 ...
We report the observation and measurement of the mass of the bottom, strange baryon Xi(b)- through the decay chain Xi(b)- -->J/psiXi-, where J/psi-->mu+mu-, Xi- -->Lambdapi-, and Lambda-->ppi-. A signal is observed whose probability of arising from a background fluctuation is 6.6 x 10(-15), or 7.7 Gaussian standard deviations. The Xi(b)- mass is measured to be 5792.9+/-2.5(stat) +/- 1.7(syst) M...
The electromagnetic form factors of the $\Lambda$ hyperon in time-like region are determined precisely through a dispersion-theoretical analysis world data for cross section annihilation process $e^+e^-\to \bar{\Lambda}{\Lambda}$. spectral function is represented by superposition narrow and broad vector meson poles. We test different scenarios obtain good description region. uncertainties extra...
In this paper, we study Friedmann cosmology with time-varying vacuum energy density in the context of Brans-Dicke theory. We consider an isotropic and homogeneous flat space, filled a matter-dominated perfect fluid dynamical cosmological term $\Lambda(t) $, obeying equation state vacuum. As exact nature possible is yet to be found, explore $\Lambda(t)$ given by phenomenological law $\Lambda(t)=...
Motivated by great progresses in experiments searching for the heavy baryons, we systematically analyze mass spectra and root mean square radius of single baryons $\Lambda_{Q}$, $\Sigma_{Q}$ $\Omega_{Q}$. The calculations are carried out frame work Godfrey-Isgur (GI) relativized quark model, where baryon is regarded as a three-body system quarks. Our results show that with $\lambda$-mode lower ...
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