The Nonperturbative Wave Functions, Transverse Momentum Distribution and QCD Vacuum Structure

It is shown that there is one-to-one correspondence between two, apparently different problems: \\ 1. The determination of the meanvalues of transverse moments \la \vec{k}_{\perp}^{2n} \ra for the nonperturbative pion wave function \psi(\k, x) and \\ 2. The evaluation of the mixed vacuum condensates \la \bar{q}G_{\mu\nu}^n q\ra . eneral properties of the theory. We define and model \psi(\k, x), satisfying all these constraints.Comment: 14pages, Cut down to meet Phys. Lett. space requirement and some additional references include

Practice Issues for Evaluation and Management of the Suicidal Left Ventricular Assist Device Patient

There is a high prevalence of depression among left ventricular assist device patients, who present with an increased risk of suicidality given access to means via the device either with nonadherence or disconnection. Suicidality via device nonadherence/disconnection is an underresearched clinical issue, as paradoxically this life-saving procedure can also provide a method of lethal means to patients with significant mental health concerns. A case study is used to highlight the course of an attempted suicide by ventricular assistive device nonadherence. Clinical implications and recommendations for practice include a thorough psychological evaluation presurgery, monitoring quality of life and coping styles before and after placement, psychological testing, outlining specific suicide protocols, psychiatric care considerations for patients with highly specialized medical devices, and related ethical concerns

Symmetry Relations for Trajectories of a Brownian Motor

A Brownian Motor is a nanoscale or molecular device that combines the effects of thermal noise, spatial or temporal asymmetry, and directionless input energy to drive directed motion. Because of the input energy, Brownian motors function away from thermodynamic equilibrium and concepts such as linear response theory, fluctuation dissipation relations, and detailed balance do not apply. The {\em generalized} fluctuation-dissipation relation, however, states that even under strongly thermodynamically non-equilibrium conditions the ratio of the probability of a transition to the probability of the time-reverse of that transition is the exponent of the change in the internal energy of the system due to the transition. Here, we derive an extension of the generalized fluctuation dissipation theorem for a Brownian motor for the ratio between the probability for the motor to take a forward step and the probability to take a backward step

What do heavy-light (Qqˉ Q\bar{q} ) quark systems tell us about QCD vacuum properties?

Arguments in favor of a large magnitude ( at least two- three times bigger than its factorized value) of the mixed vacuum condensate \la \bar{q}G_{\mu\nu}^a G_{\mu\nu}^a q \ra are given. The analysis is based on the strict inequalities which follow from the QCD sum rules method and on very plausible phenomenological assumptions like $m_{B_s} > m_{B_u}$ for the few lowest exited $Q\bar{q}$ states in a heavy quark limit $m_Q\rightarrow\infty$. The same arguments show the suppression of the $SU(3)$ symmetry breaking effects for vacuum condensates when the additional gluon fields are included.Comment: SMU-HEP-PH-9323, 18pages, LATE

QCD Calculation of the B→π,KB \rightarrow \pi,K Form Factors

We calculate the form factors for the heavy-to-light transitions $B\rightarrow \pi,K$ by means of QCD sum rules using $\pi$ and $K$ light-cone wave functions. Higher twist contributions as well as gluonic corrections are taken into account. The sensitivity to the shape of the leading-twist wave functions and effects of SU(3)-breaking are discussed. The results are compared with quark model predictions and with the results from QCD sum rules for three-point correlators.Comment: 13 pages +5 figures available upon request , LaTeX , CERN-TH.6880/93, MPI-Ph/93-32, LMU-07/9