We propose a mechanism for stabilizing the size of extra dimension in Randall-Sundrum scenario. The potential modulus field that sets fifth is generated by bulk scalar with quartic interactions localized on two 3-branes. minimum this yields compactification scale solves hierarchy problem without fine-tuning parameters.

We predict the matrix elements and resulting electron spectra for semileptonic meson decays using quark potential model. Particular attention is paid to high-energy end-point region in B decay since it crucial a determination of b\ensuremath{\rightarrow}u weak mixing angle. It argued that this usual inclusive (``quark decay'') calculations are unjustified must be replaced by explicit sums over original into low-mass exclusive hadronic final states.

An effective Lagrangian that describes the low-momentum interactions of mesons containing a heavy quark with pseudo Goldstone bosons $\ensuremath{\pi}$, $K$, and $\ensuremath{\eta}$ is constructed. It invariant under both heavy-quark spin symmetry chiral ${\mathrm{SU}(3)}_{L}\ifmmode\times\else\texttimes\fi{}{\mathrm{SU}(3)}_{R}$ symmetry. Implications for semileptonic $B$ $D$ decays are discussed.

It has recently been shown that hadrons containing a single heavy quark exhibit new flavor-spin symmetry of QCD. We discuss the implications this for masses and strong decay widths such hadrons.

The differential decay spectrum $d\Gamma/dE_e dq^2$ for the semileptonic of an unpolarized hadron containing a b-quark, and dq^2 d\!\cos\theta$ polarized $\Lambda_b$ are computed to second order in $1/m_b$ expansion. Most $1/m_b^2$ corrections have simple physical interpretation, which is discussed detail. implications results determination $V_{ub}$ discussed. spectra hadrons c-quark also given. There subtlety use equations motion at heavy quark expansion explained.

Rotational invariance is a well-established feature of low-energy physics. Violations this symmetry must be extremely small today, but could have been larger in earlier epochs. In paper we examine the consequences breaking rotational during inflationary era when primordial density fluctuations were generated. Assuming that fixed-norm vector picked out preferred-direction era, explore imprint it would leave on cosmic microwave background anisotropy, and provide explicit formulas for expected...

Strong-interaction corrections to the nonleptonic weak-interaction Hamiltonian are calculated in leading-logarithmic approximation using quantum chromodynamics. Starting with a six-quark theory, $W$ boson, $t$ quark, $b$ and $c$ quark successively considered as "heavy" effective calculated. The resulting for strangeness-changing decays involves $u$, $d$, $s$ quarks has possible $\mathrm{CP}$-violating pieces both usual $(V\ensuremath{-}A)\ifmmode\times\else\texttimes\fi{}(V\ensuremath{-}A)$...

view Abstract Citations (362) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Coupling of modes cosmological mass density fluctuations Goroff, M. H. ; Grinstein, B. Rey, S. -J. Wise, Cosmological are described by their connected correlation functions. Assuming an Omega = 1 universe with Gaussian primordial that have a Zeldovich power spectrum, the authors discuss form correlations induced nonlinearities in time evolution. cold dark matter...