266 research outputs found
Associative production of B_c and D mesons at LHC
It is shown that the study of correlations in the associative production of
B_c and D mesons at LHC allows to obtain the essential information about the
B_c production mechanism.Comment: 14 pages, 10 figures. Some misprints have been removed in the last
version. The reference to CTEQ pdf has been adde
Doubly heavy baryon production at polarized photon collider
We study the inclusive production of doubly heavy baryon at
polarized photon collider. Our results show that proper choice of the initial
beam polarizations may increase the production rate of approximately
10%.Comment: 9 pages, 5 figure
Gold-plated Mode of CP-Violation in Decays of B_c Meson from QCD Sum Rules
The model-independent method based on the triangle ideology is implemented to
extract the CKM-matrix angle gamma in the decays of doubly heavy long-lived
meson B_c. We analyze a color structure of diagrams and conditions to
reconstruct two reference-triangles by tagging the flavor and CP eigenstates of
D^0 meson in the fixed exclusive channels. The characteristic branching ratios
are evaluated in the framework of QCD sum rules.Comment: 11 pages, RevTeX4 file, 4 eps-figure
Anomalous Capacitive Sheath with Deep Radio Frequency Electric Field Penetration
A novel nonlinear effect of anomalously deep penetration of an external radio
frequency electric field into a plasma is discribed. A self-consistent kinetic
treatment reveals a transition region between the sheath and the plasma.
Because of the electron velocity modulation in the sheath, bunches in the
energetic electron density are formed in the transition region adjusted to the
sheath. The width of the region is of order , where V_{T} is the
electron thermal velocity, and is frequency of the electric field. The
presence of the electric field in the transition region results in a cooling of
the energetic electrons and an additional heating of the cold electrons in
comparison with the case when the transition region is neglected.Comment: 14,4 figure
Experimental determination of interdiffusion coefficients in vapor-gas binary systems
New interdiffusion coefficient values have been determined experimentally for four vapor-gas binary systems. The experimental results are accurate to 5%. The experimental data on interdiffusion coefficients obtained by a modified entropy method are generalized
Effect of Electron Energy Distribution Function on Power Deposition and Plasma Density in an Inductively Coupled Discharge at Very Low Pressures
A self-consistent 1-D model was developed to study the effect of the electron
energy distribution function (EEDF) on power deposition and plasma density
profiles in a planar inductively coupled plasma (ICP) in the non-local regime
(pressure < 10 mTorr). The model consisted of three modules: (1) an electron
energy distribution function (EEDF) module to compute the non-Maxwellian EEDF,
(2) a non-local electron kinetics module to predict the non-local electron
conductivity, RF current, electric field and power deposition profiles in the
non-uniform plasma, and (3) a heavy species transport module to solve for the
ion density and velocity profiles as well as the metastable density. Results
using the non-Maxwellian EEDF model were compared with predictions using a
Maxwellian EEDF, under otherwise identical conditions. The RF electric field,
current, and power deposition profiles were different, especially at 1mTorr,
for which the electron effective mean free path was larger than the skin depth.
The plasma density predicted by the Maxwellian EEDF was up to 93% larger for
the conditions examined. Thus, the non-Maxwellian EEDF must be accounted for in
modeling ICPs at very low pressures.Comment: 19 pages submitted to Plasma Sources Sci. Techno
Calculation of the B_{c}leptonic decay constant using the shifted N-expansion method
We give a review and present a comprehensive calculation for the leptonic
constant B_{c} of the low-lying pseudoscalar and vector states of B_{c}-meson
in the framework of static and QCD-motivated nonrelativistic potential models
taking into account the one-loop and two-loop QCD corrections in the short
distance coefficient that governs the leptonic constant of quarkonium
system. Further, we use the scaling relation to predict the leptonic constant
of the nS-states of the (b_bar)c system. Our results are compared with other
models to gauge the reliability of the predictions and point out differences.Comment: 26 page
Mass spectra of doubly heavy Omega_QQ' baryons
We evaluate the masses of baryons composed of two heavy quarks and a strange
quark with account for spin-dependent splittings in the framework of potential
model with the KKO potential motivated by QCD with a three-loop beta-function
for the effective charge consistent with both the perturbative limit at short
distances and linear confinement term at long distances between the quarks. The
factorization of dynamics is supposed and explored in the nonrelativistic
Schroedinger equation for the motion in the system of two heavy quarks
constituting the doubly heavy diquark and the strange quark interaction with
the diquark. The limits of approach, its justification and uncertainties are
discussed. Excited quasistable states are classified by the quantum numbers of
heavy diquark composed by the heavy quarks of the same flavor.Comment: 14 pages, revtex4-file, 3 eps-figures, 5 tables, typos correcte
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