pinecone/core-2020-05-10-deduplication huggingface dataset:
Examining leptogenesis with lepton flavor violation and the dark matter
  abundance

Within a supersymmetric (SUSY) type-I seesaw framework with flavor-blind
universal boundary conditions, we study the consequences of requiring that the
observed baryon asymmetry of the Universe be explained by either thermal or
non-thermal leptogenesis. In the former case, we find that the parameter space
is very constrained. In the bulk and stop-coannihilation regions of mSUGRA
parameter space (that are consistent with the measured dark matter abundance),
lepton flavor-violating (LFV) processes are accessible at MEG and future
experiments. However, the very high reheat temperature of the Universe needed
after inflation (of about 10^{12} GeV) leads to a severe gravitino problem,
which disfavors either thermal leptogenesis or neutralino dark matter.
Non-thermal leptogenesis in the preheating phase from SUSY flat directions
relaxes the gravitino problem by lowering the required reheat temperature. The
baryon asymmetry can then be explained while preserving neutralino dark matter,
and for the bulk or stop-coannihilation regions LFV processes should be
observed in current or future experiments.Comment: 20 pages, 5 figures, 1 tabl
Top-Quark Forward-Backward Asymmetry in Randall-Sundrum Models Beyond
  the Leading Order

We calculate the ttbar forward-backward asymmetry, A_FB^t, in Randall-Sundrum
(RS) models taking into account the dominant next-to-leading order (NLO)
corrections in QCD. At Born level we include the exchange of Kaluza-Klein (KK)
gluons and photons, the Z boson and its KK excitations, as well as the Higgs
boson, whereas beyond the leading order (LO) we consider the interference of
tree-level KK-gluon exchange with one-loop QCD box diagrams and the
corresponding bremsstrahlungs corrections. We find that the strong suppression
of LO effects, that arises due to the elementary nature and the mostly
vector-like couplings of light quarks, is lifted at NLO after paying the price
of an additional factor of alpha_s/(4 pi). In spite of this enhancement, the
resulting RS corrections in A_FB^t remain marginal, leaving the predicted
asymmetry SM-like. As our arguments are solely based on the smallness of the
axial-vector couplings of light quarks to the strong sector, our findings are
model-independent and apply to many scenarios of new physics that address the
flavor problem via geometrical sequestering.Comment: 29 pages, 1 table, 5 figures; v2: matches version published in JHE
F-theoretic vs microscopic description of a conformal N=2 SYM theory

The F-theory background of four D7 branes in a type I' orientifold was
conjectured to be described by the Seiberg-Witten curve for the superconformal
SU(2) gauge theory with four flavors. This relation was explained by
considering in this background a probe D3 brane, which supports this theory
with SU(2) realized as Sp(1). Here we explicitly compute the non-perturbative
corrections to the D7/D3 system in type I' due to D-instantons. This
computation provides both the quartic effective action on the D7 branes and the
quadratic effective action on the D3 brane; the latter agrees with the
F-theoretic prediction. The action obtained in this way is related to the one
derived from the usual instanton calculus \`a la Nekrasov (or from its AGT
realization in terms of Liouville conformal blocks) by means of a
non-perturbative redefinition of the coupling constant. We also point out an
intriguing relation between the four-dimensional theory on the probe D3 brane,
which has a SO(8) flavor symmetry, and the eight-dimensional dynamics on the D7
branes. On the latter, SO(8) represents a gauge group and the flavor masses
correspond to the vacuum expectation values of an adjoint scalar field m: what
we find is that the exact effective coupling in four dimensions is obtained
from its perturbative part by taking into account in its mass dependence the
full quantum dynamics of the field m in eight dimensions.Comment: 44 pages, 2 figures, PdfLaTeX. V2: Typos fixed, a few references
  added, Eq. (2.28) corrected, improved discussion in Section 3.4, a couple of
  sentences reformulated in section 7. Version published on JHE
Group Theory of Non-Abelian Vortices

We investigate the structure of the moduli space of multiple BPS non-Abelian
vortices in U(N) gauge theory with N fundamental Higgs fields, focusing our
attention on the action of the exact global (color-flavor diagonal) SU(N)
symmetry on it. The moduli space of a single non-Abelian vortex, CP(N-1), is
spanned by a vector in the fundamental representation of the global SU(N)
symmetry. The moduli space of winding-number k vortices is instead spanned by
vectors in the direct-product representation: they decompose into the sum of
irreducible representations each of which is associated with a Young tableau
made of k boxes, in a way somewhat similar to the standard group composition
rule of SU(N) multiplets. The K\"ahler potential is exactly determined in each
moduli subspace, corresponding to an irreducible SU(N) orbit of the
highest-weight configuration.Comment: LaTeX 46 pages, 4 figure
An associative star-three-product and applications to M two/M five-brane
  theory

The star-product between functions enable us to take the large $N$ limit in a
controlled way. At finite $N$ it serves as a substitute for matrix
multiplications. Non-abelian gauge theory can be deconstructed from lower
dimensional gauge theories using star-products. In this paper we extend the
star-product to a star-three-product. We then apply the star-three-product to
realize hermitian three-algebra of ABJM theory. We define a fuzzy three-torus.
We deconstruct Abelian M five-brane in a constant background three-form
potential on a fuzzy three-torus. We deconstruct non-Abelian extensions which
might be related with multiple M five branes. We also mention the fuzzy
three-sphere case.Comment: 53 page
NLO QCD bottom corrections to Higgs boson production in the MSSM

We present a calculation of the two-loop bottom-sbottom-gluino contributions
to Higgs boson production via gluon fusion in the MSSM. The calculation is
based on an asymptotic expansion in the masses of the supersymmetric particles,
which are assumed to be much heavier than the bottom quark and the Higgs
bosons. We obtain explicit analytic results that allow for a straightforward
identification of the dominant contributions in the NLO bottom corrections. We
emphasize the interplay between the calculations of the masses and the
production cross sections of the Higgs bosons, discussing sensible choices of
renormalization scheme for the parameters in the bottom/sbottom sector.Comment: 25 pages, 4 figures. v2: references and two figures added, version
  published in JHE
Electron-to-Tau Lepton Flavor Violation at the Electron-Ion Collider

We analyze the potential sensitivity of a search for $e\rightarrow\tau$
conversion at a proposed electron-ion collider (EIC) facility. To that end, we
calculate the cross sections for $e\rightarrow\tau$ events in a leptoquark
framework assuming that the leptoquark masses are on the order of several
hundred GeV or more. Given present limits on leptoquarks from direct searches
at HERA and rare decay processes, an EIC sensitive to 0.1 fb $e\rightarrow\tau$
cross sections could probe previously unexplored regions of parameter space for
these lepton flavor violating events (assuming 90 GeV center-of-mass energy and
10 fb$^{-1}$ integrated luminosity). Depending on the species of leptoquark and
flavor structure of the couplings, an EIC search could surpass the HERA and
rare process sensitivity to $e\rightarrow\tau$ conversion amplitudes by as much
as an order of magnitude or more. We also derive updated limits on quark
flavor-diagonal LFV leptoquark interactions using the most recent BaBar
$\tau\rightarrow e\gamma$ search. We find that limits from an EIC
$e\rightarrow\tau$ search could be competitive with the most recent
$\tau\rightarrow e\gamma$ limit for a subset of the quark flavor-diagonal
leptoquark couplings. Using an SU(5) GUT model in which leptoquark couplings
are constrained by the neutrino masses and mixing, we illustrate how observable
leptoquark-induced $e\rightarrow\tau$ conversion can be consistent with
stringent LFV limits imposed by $\mu\rightarrow e\gamma$ and $\mu\rightarrow e$
conversion searches.Comment: 19 pages, 7 figure
Slepton co-NLSPs at the Tevatron

We study the Tevatron signatures of promptly-decaying slepton co-NLSPs in the
context of General Gauge Mediation (GGM). The signatures consist of trileptons
plus MET and same-sign dileptons plus MET. Focusing first on electroweak
production, where the Tevatron has an advantage over the early LHC, we
establish four simple benchmark scenarios within the parameter space of GGM
which qualitatively capture all the relevant phenomenology. We derive limits on
these benchmarks from existing searches, estimate the discovery potential with
10 fb^-1, and discuss ways in which these searches can be optimized for slepton
co-NLSPs. We also analyze the Tevatron constraints on a scenario with light
gluinos that could be discovered at the early LHC. Overall, we find that the
Tevatron still has excellent reach for the discovery of SUSY in multilepton
final states. Finally, we comment on the possible interpretation of a mild
"excess" in the CDF same-sign dilepton search in terms of slepton co-NLSPs.Comment: 31 pages + appendices, published version, references adde
Massive type IIA string theory cannot be strongly coupled

Understanding the strong coupling limit of massive type IIA string theory is
a longstanding problem. We argue that perhaps this problem does not exist;
namely, there may be no strongly coupled solutions of the massive theory. We
show explicitly that massive type IIA string theory can never be strongly
coupled in a weakly curved region of space-time. We illustrate our general
claim with two classes of massive solutions in AdS4xCP3: one, previously known,
with N = 1 supersymmetry, and a new one with N = 2 supersymmetry. Both
solutions are dual to d = 3 Chern-Simons-matter theories. In both these massive
examples, as the rank N of the gauge group is increased, the dilaton initially
increases in the same way as in the corresponding massless case; before it can
reach the M-theory regime, however, it enters a second regime, in which the
dilaton decreases even as N increases. In the N = 2 case, we find
supersymmetry-preserving gauge-invariant monopole operators whose mass is
independent of N. This predicts the existence of branes which stay light even
when the dilaton decreases. We show that, on the gravity side, these states
originate from D2-D0 bound states wrapping the vanishing two-cycle of a
conifold singularity that develops at large N.Comment: 43 pages, 5 figures. v2: added reference
An R-parity conserving radiative neutrino mass model without
  right-handed neutrinos

The model proposed by A. Zee (1986) and K.S. Babu (1988) is a simple
radiative seesaw model, in which tiny neutrino masses are generated at the
two-loop level. We investigate a supersymmetric extension of the Zee-Babu model
under R-parity conservation. The lightest superpartner particle can then be a
dark matter candidate. We find that the neutrino data can be reproduced with
satisfying current data from lepton flavour violation even in the scenario
where not all the superpartner particles are heavy. Phenomenology at the Large
Hadron Collider is also discussed.Comment: 19 pages, 5 figure
NLO QCD corrections to five-jet production at LEP and the extraction of αs(MZ)

The highest exclusive jet multiplicity studied at LEP experiments is five. In this paper we compute the next-to-leading order QCD corrections to e + e ‑ annihilation to five jets, essentially closing the (pure) perturbative QCD studies of exclusive jetty final states at LEP. We compare fixed-order perturbative results with ALEPH data. We estimate hadronization corrections to five-jet observables using the event generator SHERPA, which employs the CKKW procedure to combine a reliable perturbative treatment of high-multiplicity jet final states with parton showers. We show that a competitive value of the strong coupling constant {α_s}left( {{M_Z}} right) = 0.1156_{ - 0.0034}^{ + 0.0041} can be extracted from the distribution of the five-jet resolution parameter and the five-jet rate at LEP1 and LEP2
String-Gauge Dual Description of Deep Inelastic Scattering at Small-$x$

The AdS/CFT correspondence in principle gives a new approach to deep
inelastic scattering as formulated by Polchinski and Strassler. Subsequently
Brower, Polchinski, Strassler and Tan (BPST) computed the strong coupling
kernel for the vacuum (or Pomeron) contribution to total cross sections. By
identifying deep inelastic scattering with virtual photon total cross section,
this allows a self consistent description at small-$x$ where the dominant
contribution is the vacuum exchange process. Here we formulate this
contribution and compare it with HERA small-$x$ DIS scattering data. We find
that the BPST kernel along with a very simple local approximation to the proton
and current "wave functions" gives a remarkably good fit not only at large
$Q^2$ dominated by conformal symmetry but also extends to small $Q^2$,
supplemented by a hard-wall cut-off of the AdS in the IR. We suggest that this
is a useful phenomenological parametrization with implications for other
diffractive processes, such as double diffractive Higgs production.Comment: 31 pages, 9 figures. More references and several few clarifying
  remarks added. Fits to the most recent H1/ZEUS data unchange
Global Symmetries and D-Terms in Supersymmetric Field Theories

We study the role of D-terms in supersymmetry (SUSY) breaking. By carefully
analyzing the SUSY multiplets containing various conserved currents in theories
with global symmetries, we obtain a number of constraints on the
renormalization group flow in supersymmetric field theories. Under broad
assumptions, these results imply that there are no SUSY-breaking vacua, not
even metastable ones, with parametrically large D-terms. This explains the
absence of such D-terms in models of dynamical SUSY-breaking. There is,
however, a rich class of calculable models which generate comparable D-terms
and F-terms through a variety of non-perturbative effects; these D-terms can be
non-abelian. We give several explicit examples of such models, one of which is
a new calculable limit of the 3-2 model.Comment: 34 pages, 2 figures; reference added, minor change
Measuring Black Hole Formations by Entanglement Entropy via
  Coarse-Graining

We argue that the entanglement entropy offers us a useful coarse-grained
entropy in time-dependent AdS/CFT. We show that the total von-Neumann entropy
remains vanishing even when a black hole is created in a gravity dual, being
consistent with the fact that its corresponding CFT is described by a
time-dependent pure state. We analytically calculate the time evolution of
entanglement entropy for a free Dirac fermion on a circle following a quantum
quench. This is interpreted as a toy holographic dual of black hole creations
and annihilations. It is manifestly free from the black hole information
problem.Comment: 25 pages, Latex, 8 figure
One-dimensional holographic superconductor from AdS_3/CFT_2
  correspondence

We obtain a holographical description of a superconductor by using the d=2
case of the AdS_{d+1}/CFT_d correspondence. The gravity system is a
(2+1)-dimensional AdS black hole coupled to a Maxwell field and charged scalar.
The dual (1+1)-dimensional superconductor will be strongly correlated. The
characteristic exponents for vector perturbations at the boundary degenerate,
which implies that d=2 is a critical dimension and the Green's function needs
to be regularized. In the normal phase, the current-current correlation
function and the conductivity can be analytically solved at zero chemical
potential. The dc conductivity can be analytically solved at finite chemical
potential. When we add a scalar hair to the black hole, a charged condensate
happens at low temperatures. We compare our results with higher-dimensional
cases.Comment: 22 pages, 7 figures; v2: minor corrections; v3: published versio
CFT and topological recursion

We study the quasiclassical expansion associated with a complex curve. In a
more specific context this is the 1/N expansion in U(N)-invariant matrix
integrals. We compare two approaches, the CFT approach and the topological
recursion, and show their equivalence. The CFT approach reformulates the
problem in terms of a conformal field theory on a Riemann surface, while the
topological recursion is based on a recurrence equation for the observables
representing symplectic invariants on the complex curve. The two approaches
lead to two different graph expansions, one of which can be obtained as a
partial resummation of the other.Comment: Minor correction
Three-Body Nuclear Forces from a Matrix Model

We compute three-body nuclear forces at short distances by using the nuclear
matrix model of holographic QCD proposed in our previous paper with P. Yi. We
find that the three-body forces at short distances are repulsive for (a)
aligned three neutrons with averaged spins, and (b) aligned
proton-proton-neutron / proton-neutron-neutron. These indicate that in dense
states of neutrons such as cores of neutron stars, or in Helium-3 / tritium
nucleus, the repulsive forces are larger than the ones estimated from two-body
forces only.Comment: 25 pages. v2: references adde
Effects of Large Threshold Corrections in Supersymmetric Type-I Seesaw
  Model

We investigate lepton flavor violating (LFV) radiative processes and the
relic abundance of neutralino dark matter in supersymmetric type-I seesaw
model. We carefully derive threshold corrections to the flavor off-diagonal
elements of slepton mass matrix and up-type Higgs mass squared and find that
they can be large in the case of large $B_N^0$. We examine how the branching
ratios of LFV radiative decays and the relic abundance of neutralino dark
matter can be significantly affected by the large threshold corrections. Soft
scalar mass squared parameter of up-type Higgs scalar is also affected by the
threshold corrections. Since the higgsino mass depends on the mass parameter
for up-type Higgs, the LFV processes and the relic abundance of the neutralino
dark matter are correlated with each other. We show that there are parameter
regions where the predictions of the relic abundance of neutralino dark matter
are consistent with WMAP observation and the branching ratios of LFV radiative
decays are predicted to be testable in future experiments. We find that the
masses of scalar supersymmetric particles are not necessarily small so that the
branching ratios of LFV decays can be testable in future experiment, which is
distinctive feature of this scenario.Comment: 32 pages, 6 figures, references are added, the version to appear in
  JHE
Extremal limits of the Cvetic-Youm black hole and nilpotent orbits of
  G2(2)

We study extremal cohomogeneity one five-dimensional asymptotically flat
black holes of minimal supergravity in terms of the geodesics generated by
nilpotent elements of the Lie algebra g2(2) on the coset manifold
G2(2)/SO(2,2). There are two branches of regular extremal black holes with
these properties: (i) the supersymmetric BMPV branch, and (ii) the
non-supersymmetric extremal branch. We show that both of these branches are
reproduced by nilpotent SO(2,2)-orbits. Furthermore, we show that the partial
ordering of nilpotent orbits of G2(2) is in one-to-one correspondence with the
phase diagram of these extremal black holes.Comment: 17 pages, 2 figures; v2 two minus sign typos in appendix A equation
  (A.3) corrected, no other change
Non Abelian Geometrical Tachyon

We investigate the dynamics of a pair of coincident D5 branes in the
background of $k$ NS5 branes. It has been proposed by Kutasov that the system
with a single probing D-brane moving radially in this background is dual to the
tachyonic DBI action for a non-BPS Dp brane. We extend this proposal to the
non-abelian case and find that the duality still holds provided one promotes
the radial direction to a matrix valued field associated with a non-abelian
geometric tachyon and a particular parametrization for the transverse scalar
fields is chosen. The equations of motion of a pair of coincident D5 branes
moving in the NS5 background are determined. Analytic and numerical solutions
for the pair are found in certain simplified cases in which the U(2) symmetry
is broken to $U(1) \times U(1)$ corresponding to a small transverse separation
of the pair. For certain range of parameters these solutions describe periodic
motion of the centre of mass of the pair 'bouncing off' a finite sized throat
whose minimum size is limited by the D5 branes separation.Comment: 18 pages, 2 figures, PdfLatex: references added.accepted for
  publication in JHE
Stringy effects in black hole decay

We compute the low energy decay rates of near-extremal three(four) charge
black holes in five(four) dimensional N=4 string theory to sub-leading order in
the large charge approximation. This involves studying stringy corrections to
scattering amplitudes of a scalar field off a black hole. We adapt and use
recently developed techniques to compute such amplitudes as near-horizon
quantities. We then compare this with the corresponding calculation in the
microscopic configuration carrying the same charges as the black hole. We find
perfect agreement between the microscopic and macroscopic calculations; in the
cases we study, the zero energy limit of the scattering cross section is equal
to four times the Wald entropy of the black hole.Comment: 32 page
Constraining Scalar Singlet Dark Matter with CDMS, XENON and DAMA and
  Prediction for Direct Detection Rates

We consider a simplest extension of the Standard Model (SM) through the
incorporation of a real scalar singlet and an additional discrete $Z_2$
symmetry. The model admits the neutral scalar singlet to be stable and thus, a
viable component of dark matter. We explore the parameter space of the model
keeping in view the constraints arise from different dark matter direct
detection experiments through WIMP-nucleon scattering. First of all, we have
utilised the data obtained from CDMS, XENON-10 and XENON-100 collaborations. We
further constraint the parameter space from the DAMA collaboration results
(both with and without channelling) and CoGeNT collaboration results.
Throughout our analysis, the constraint arises due to the observed relic
density of dark matter reported by WMAP experiment, is also incorporated.
Utilising all those constraints, on the model parameter space, we calculate the
event rates and the annual variation of event rates in the context of a Liquid
Argon Detector experiment.Comment: 16 pages, 6 figures ; Text modified, figures modifie