259 research outputs found

### CP Violation Highlights: Circa 2005

Recent highlights in CP violation phenomena are reviewed. B-factory results
imply that CP-violation phase in the CKM matrix is the dominant contributor to
the observed CP violation in K and B-physics. Deviations from the predictions
of the CKM-paradigm due to beyond the Standard Model CP-odd phase are likely to
be a small perturbation. Therefore, large data sample of clean B's will be
needed. Precise determination of the unitarity triangle, along with time
dependent CP in penguin dominated hadronic and radiative modes are discussed.
Null tests in B, K and top-physics and separate determination of the
K-unitarity triangle are also emphasized.Comment: Invited talk at "Results and Perspectives in Particle Physics", La
Thuile, Acosta Valley, Feb27-Mar3, 200

### Hadronic matrix elements from the lattice

Lattice matrix elements are briefly reviewed. In the quenched approximation
$f_B$, $B_B$ and $B_K$ are now under good control. Experimental hints for
$f^{\rm expt}_{D_S}> f^{\rm QQCD}_{D_S}$ are noted; precise determination of
$f_{D_S}$ from experiment as well as from the lattice is strongly advocated.
Lattice calculations of the form factor for $B\to\pi\ell\nu$ at relatively
large value of $q^2$ have made good progress and should be useful in
conjunction with precise measurement of the differential spectra expected from
$B$-factories. Recent attempt at $K\to \pi\pi$ using staggered quarks is
briefly discussed; use of non-perturbative renormalization, improved actions
and operators with staggered quarks is emphasized. Due to the good chiral
behavior of domain wall quarks it would be useful to study $K\to \pi\pi$ with
this discretization.Comment: 8 pages, Invited talk given at the Third International Conference on
B Physics and CP Violation, Taipei, Dec. 3-7, 9

### Towards establishing the spin of warped gravitons

We study the possibility of experimental verification of the spin=2 nature of
the Kaluza-Klein (KK) graviton which is predicted to exist in the
extra-dimensional Randal-Sundrum (RS) warped models. The couplings of these
gravitons to the particles located on or near the TeV brane is the strongest as
the overlap integral of their profiles in the extra-dimension is large. Among
them are unphysical Higgses ($W^{\pm}_L$ and $Z_L$) and KK excitations of the
Standard Model (SM) gauge bosons. We consider the possibility to confirm the
spin-2 nature of the first KK mode of the warped graviton ($G_1$) based on the
angular distribution of the Z bozon in the graviton rest frame in the gg$\to
G_1 \to W^{KK} (Z^{KK}) W (Z)\to WWZ$, gg$\to G_1\to ZZ$ and gg$\to G_1 \to
Z^{KK} Z\to ZZH$ decay channels. Using Wigner D-matrix properties, we derive
the relationship between the graviton spin, signal angular distribution peak
value, and other theoretically calculable quantities. We then study the LHC
signals for these decay modes and find that with 1000 fb$^{-1}$ of data, spin
of the RS graviton up to $\sim$ 2 TeV may be confirmed in the $pp \to W^{KK}
(Z^{KK}) W (Z) \to WWZ \to$ 3 leptons + jet + \slashed{E}_T and $pp \to ZZ
\to$ 4 leptons decay modes.Comment: 19 pages, 6 figure

### Gravitational Waves From SU(N) Glueball Dark Matter

A hidden sector with pure non-abelian gauge symmetry is an elegant and just
about the simplest model of dark matter. In this model the dark matter
candidate is the lightest bound state made of the confined gauge fields, the
dark glueball. In spite of its simplicity, the model has been shown to have
several interesting non-standard implications in cosmology. In this work, we
explore the gravitational waves from binary boson stars made of
self-gravitating dark glueball fields as a natural and important consequence.
We derive the dark SU($N$) star mass and radius as functions of the only two
fundamental parameters in the model, the glueball mass $m$ and the number of
colors $N$, and identify the regions that could be probed by the LIGO and
future gravitational wave observatories.Comment: 10 pages, 3 figures. v2: Couple of refs added with very minor
changes. v3: Published versio

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