5,898 research outputs found
Heavy Meson Physics: What have we learned in Twenty Years?
I give a personal account of the development of the field of heavy quarks.
After reviewing the experimental discovery of charm and bottom quarks, I
describe how the field's focus shifted towards determination of CKM elements
and how this has matured into a precision science.Comment: This talk was presented during the ceremony awarding the Medalla 2003
of the Division of Particles and Fields of The Mexican Phsyical Society, at
the IX Mexican Workshop on Particles and Fields; submitted for proceedings; 9
pages, 9 figures; replacement: fix multiple typo
Infinite randomness and quantum Griffiths effects in a classical system: the randomly layered Heisenberg magnet
We investigate the phase transition in a three-dimensional classical
Heisenberg magnet with planar defects, i.e., disorder perfectly correlated in
two dimensions. By applying a strong-disorder renormalization group, we show
that the critical point has exotic infinite-randomness character. It is
accompanied by strong power-law Griffiths singularities. We compute various
thermodynamic observables paying particular attention to finite-size effects
relevant for an experimental verification of our theory. We also study the
critical dynamics within a Langevin equation approach and find it extremely
slow. At the critical point, the autocorrelation function decays only
logarithmically with time while it follows a nonuniversal power-law in the
Griffiths phase.Comment: 10 pages, 2 eps figures included, final version as published
Light scalar at LHC: the Higgs or the dilaton?
It is likely that the LHC will observe a color- and charge-neutral scalar
whose decays are consistent with those of the Standard Model (SM) Higgs boson.
The Higgs interpretation of such a discovery is not the only possibility. For
example, electroweak symmetry breaking (EWSB) could be triggered by a
spontaneously broken, nearly conformal sector. The spectrum of states at the
electroweak scale would then contain a narrow scalar resonance, the
pseudo-Goldstone boson of conformal symmetry breaking, with Higgs-like
properties. If the conformal sector is strongly coupled, this pseudo-dilaton
may be the only new state accessible at high energy colliders. We discuss the
prospects for distinguishing this mode from a minimal Higgs boson at the LHC
and ILC. The main discriminants between the two scenarios are (1) cubic
self-interactions and (2) a potential enhancement of couplings to massless SM
gauge bosons. A particularly interesting situation arises when the scale f of
conformal symmetry breaking is approximately the electroweak scale v~246 GeV.
Although in this case the LHC may not be able to tell apart a pseudo-dilaton
from the Higgs boson, the self-interactions differ in a way that depends only
on the scaling dimension of certain operators in the conformal sector. This
opens the possibility of using dilaton pair production at future colliders as a
probe of EWSB induced by nearly conformal new physics.Comment: 7 pages, LaTe
Bulk Observers in Non-Factorizable Geometries
We consider five dimensional non-factorizable geometries where the transverse dimension is bounded and the remaining (parallel) dimensions are not. We study the construction of effective theories at distances much longer than the transverse size. An observer unable to resolve the transverse direction can only measure distances along the parallel dimensions, but the non-factorizable geometry makes the length of a curve along the parallel dimension sensitive to where on the transverse direction the curve lies. We show that long geodesics that differ in their endpoints only by shifts along the transverse direction all have the same length to within the observer's resolution. We argue that this is the correct notion of distance in the effective theory for a bulk observer. This allows us to present a consistent interpretation of what is measured by observers that live either on a brane or in the bulk
Operator Product Expansion for Exclusive Decays: B^+ ->Ds^+ e+e- and B^+ -> Ds^{*+} e+e-
The decays and proceed
through a weak and an electromagnetic interaction. This is a typical ``long
distance'' process, usually difficult to compute systematically. We propose
that over a large fraction of phase space a combination of an operator product
and heavy quark expansions effectively turns this process into one in which the
weak and electromagnetic interactions occur through a local operator. Moreover,
we use heavy quark spin symmetry to relate all the local operators that appear
in leading order of the operator expansion to two basic ones. We use this
operator expansion to estimate the decay rates for .Comment: 4 pages, 1 figure, Latex, published version in PR
Comment on `Note on X(3872) production at hadron colliders and its molecular structure'
We briefly comment on the paper by Albaladejo et al. [arXiv:1709.09101],
rejecting its conclusions.Comment: This paper was prepared at the request of a journal editor. 3 Pages,
no figure
A Mixed Phase of SUSY Gauge Theories from a-Maximization
We study N=1 supersymmetric SU(N) gauge theories with an antisymmetric tensor
and F flavors using the recent proposal of a-maximization by Intriligator and
Wecht. This theory had previously been studied using the method of
"deconfinement", but such an analysis was not conclusive since anomalous
dimensions in the non-perturbative regime could not be calculated. Using
a-maximization we show that for a large range of F the theory is at an
interacting superconformal fixed point. However, we also find evidence that for
a range of F the theory in the IR splits into a free "magnetic" gauge sector
and an interacting superconformal sector.Comment: 18 pages, 3 figure
Dynamical properties of the Landau-Ginzburg model with long-range correlated quenched impurities
We investigate the critical dynamics of the time-dependent Landau-Ginzburg
model with non conserved n-component order parameter (Model A) in the presence
of long-range correlated quenched impurities. We use a special kind of
long-range correlations, previously introduced by Weinrib and Halperin. Using a
double expansion in \epsilon and \delta we calculate the critical exponent z up
to second order on the small parameters. We show that the quenched impurities
of this kind affect the critical dynamics already in first order of \epsilon
and \delta, leading to a relevant correction for the mean field value of the
exponent zComment: 7 pages, REVTEX, to be published in Phys. Rev.
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