pinecone/core-2020-05-10-deduplication huggingface dataset:
Looking for the WIMP Next Door

We comprehensively study experimental constraints and prospects for a class
of minimal hidden sector dark matter (DM) models, highlighting how the
cosmological history of these models informs the experimental signals. We study
simple "secluded" models, where the DM freezes out into unstable dark mediator
states, and consider the minimal cosmic history of this dark sector, where
coupling of the dark mediator to the SM was sufficient to keep the two sectors
in thermal equilibrium at early times. In the well-motivated case where the
dark mediators couple to the Standard Model (SM) via renormalizable
interactions, the requirement of thermal equilibrium provides a minimal,
UV-insensitive, and predictive cosmology for hidden sector dark matter. We call
DM that freezes out of a dark radiation bath in thermal equilibrium with the SM
a WIMP next door, and demonstrate that the parameter space for such WIMPs next
door is sharply defined, bounded, and in large part potentially accessible.
This parameter space, and the corresponding signals, depend on the leading
interaction between the SM and the dark mediator; we establish it for both
Higgs and vector portal interactions. In particular, there is a cosmological
lower bound on the portal coupling strength necessary to thermalize the two
sectors in the early universe. We determine this thermalization floor as a
function of equilibration temperature for the first time. We demonstrate that
direct detection experiments are currently probing this cosmological lower
bound in some regions of parameter space, while indirect detection signals and
terrestrial searches for the mediator cut further into the viable parameter
space. We present regions of interest for both direct detection and dark
mediator searches, including motivated parameter space for the direct detection
of sub-GeV DM.Comment: 32 pages + Appendix, 14 figure
Leptoquarks meet $\varepsilon'/\varepsilon$ and rare Kaon processes

We analyse for the first time the CP violating ratio
$\varepsilon'/\varepsilon$ in $K\to \pi\pi$ decays in leptoquark (LQ) models.
Assuming a mass gap to the electroweak (EW) scale, the main mechanism for LQs
to contribute to $\varepsilon'/\varepsilon$ is EW gauge-mixing of semi-leptonic
into non-leptonic operators, which we treat in the Standard Model effective
theory (SMEFT). We perform also the one-loop decoupling for scalar LQs, finding
that in all models with both left-handed and right-handed LQ couplings
box-diagrams generate numerically strongly enhanced EW-penguin operators
$Q_{8,8'}$ already at the LQ scale. We then investigate correlations of
$\varepsilon'/\varepsilon$ with rare Kaon processes ($K_L\to\pi^0\nu\bar\nu$,
$K^+\to\pi^+\nu\bar\nu$, $K_L\to\pi^0\ell\bar\ell$, $K_S\to\mu\bar\mu$, $\Delta
M_K$ and $\varepsilon_K$) and find that even imposing only a moderate
enhancement of $(\varepsilon'/\varepsilon)_{\rm NP} = 5 \times 10^{-4}$ to
explain the current anomaly hinted by the Dual QCD approach and RBC-UKQCD
lattice QCD calculations leads to conflicts with experimental upper bounds on
rare Kaon processes. They exclude all LQ models with only a single coupling as
an explanation of the $\varepsilon'/\varepsilon$ anomaly and put
strong-to-serious constraints on parameter spaces of the remaining models.
Future results on $K^+\to\pi^+\nu\bar\nu$ from the NA62 collaboration,
$K_L\to\pi^0\nu\bar\nu$ from the KOTO experiment and $K_S\to\mu\bar\mu$ from
LHCb will even stronger exhibit the difficulty of LQ models in explaining the
measured $\varepsilon'/\varepsilon$, in case the $\varepsilon'/\varepsilon$
anomaly will be confirmed by improved lattice QCD calculations. Hopefully also
improved measurements of $K_L\to\pi^0\ell\bar\ell$ decays will one day help in
this context.Comment: 53 pages, 9 figures; v2: minor extensions, matches published version;
  v3: corrected eq.(B.10) and figure 2 (right plot U_1,L), conclusions not
  affecte
Very light dilaton and naturally light Higgs boson

We study very light dilaton, arising from a scale-invariant ultraviolet
theory of the Higgs sector in the standard model of particle physics. Imposing
the scale symmetry below the ultraviolet scale of the Higgs sector, we
alleviate the fine-tuning problem associated with the Higgs mass. When the
electroweak symmetry is spontaneously broken radiatively \`a la
Coleman-Weinberg, the dilaton develops a vacuum expectation value away from the
origin to give an extra contribution to the Higgs potential so that the Higgs
mass becomes naturally around the electroweak scale. The ultraviolet scale of
the Higgs sector can be therefore much higher than the electroweak scale, as
the dilaton drives the Higgs mass to the electroweak scale. We also show that
the light dilaton in this scenario is a good candidate for dark matter of mass
$m_D\sim 1~{\rm eV}-10~{\rm keV}$, if the ultraviolet scale is about
$10-100~{\rm TeV}$. Finally we propose a dilaton-assisted composite Higgs model
to realize our scenario. In addition to the light dilaton the model predicts a
heavy ${\rm U}(1)$ axial vector boson and two massive, oppositely charged,
pseudo Nambu-Goldstone bosons, which might be accessible at LHC.Comment: 20 pages, 5 figures; v4. an appendix added, to appear in JHE
The ALP miracle revisited

We revisit the ALP miracle scenario where the inflaton and dark matter are
unified by a single axion-like particle (ALP). We first extend our previous
analysis on the inflaton dynamics to identify the whole viable parameter space
consistent with the CMB observation. Then, we evaluate the relic density of the
ALP dark matter by incorporating uncertainties of the model-dependent couplings
to the weak gauge bosons as well as the dissipation effect. The preferred
ranges of the ALP mass and coupling to photons are found to be $0.01\lesssim
m_{\phi} \lesssim 1$ eV and $g_{\phi \gamma \gamma} = {\cal O}(10^{-11})$
GeV$^{-1}$, which slightly depend on these uncertainties. Interestingly, the
preferred regions are within the reach of future solar axion helioscope
experiments IAXO and TASTE and laser-based stimulated photon-photon collider
experiments. We also discuss possible extensions of the ALP miracle scenario by
introducing interactions of the ALP with fermions.Comment: 29 pages, 8 figure
Flavoured Dark Matter Moving Left

We investigate the phenomenology of a simplified model of flavoured Dark
Matter (DM), with a dark fermionic flavour triplet coupling to the left-handed
$SU(2)_L$ quark doublets via a scalar mediator. The DM-quark coupling matrix is
assumed to constitute the only new source of flavour and CP violation,
following the hypothesis of Dark Minimal Flavour Violation. We analyse the
constraints from LHC searches, from meson mixing data in the $K$, $D$, and
$B_{d,s}$ meson systems, from thermal DM freeze-out, and from direct detection
experiments. Our combined analysis shows that while the experimental
constraints are similar to the DMFV models with DM coupling to right-handed
quarks, the multitude of couplings between DM and the SM quark sector resulting
from the $SU(2)_L$ structure implies a richer phenomenology and significantly
alters the resulting impact on the viable parameter space.Comment: 23 pages, 11 figures. v2: some clarifying comments and references
  added, matches published versio
Classifying integrable symmetric space strings via factorized scattering

All symmetric space $AdS_n$ solutions of type II supergravity have recently
been found for $n>2$. For the supersymmetric solutions (and their T-duals) it
is known that the Green-Schwarz string is classically integrable. We complete
the classification by ruling out integrability for the remaining
non-supersymmetric solutions. This is achieved by showing that tree-level
scattering on the worldsheet of a GKP or BMN string fails to factorize for
these cases.Comment: 17 pages; v2: Improvements to sec 1, results now summarized in Tab 1.
  Matches published versio
Simplified TeV leptophilic dark matter in light of DAMPE data

Using a simplified framework, we attempt to explain the recent DAMPE cosmic
$e^+ + e^-$ flux excess by leptophilic Dirac fermion dark matter (LDM). The
scalar ($\Phi_0$) and vector ($\Phi_1$) mediator fields connecting LDM and
Standard Model particles are discussed. Under constraints of DM relic density,
gamma-rays, cosmic-rays and Cosmic Microwave Background (CMB), we find that the
couplings $P \otimes S$, $P \otimes P$, $V \otimes A$ and $V \otimes V$ can
produce the right bump in $e^+ + e^-$ flux for a DM mass around 1.5 TeV with a
natural thermal annihilation cross-section $<\sigma v> \sim 3 \times 10^{-26}
cm^3/s$ today. Among them, $V \otimes V$ coupling is tightly constrained by
PandaX-II data (although LDM-nucleus scattering appears at one-loop level) and
the surviving samples appear in the resonant region, $m_{\Phi_1} \simeq
2m_{\chi}$. We also study the related collider signatures, such as dilepton
production $pp \to \Phi_1 \to \ell^+\ell^-$, and muon $g-2$ anomaly. Finally,
we present a possible $U(1)_X$ realization for such leptophilic dark matter.Comment: discussions added, version accepted by JHE
Momentum-space resummation for transverse observables and the Higgs
  $p_\perp$ at N$^3$LL+NNLO

We present an approach to the momentum-space resummation of global, recursive
infrared and collinear safe observables featuring kinematic zeros away from the
Sudakov limit. In the hadro-production of a generic colour singlet, we consider
the family of inclusive observables which do not depend on the rapidity of the
radiation, prime examples being the transverse momentum of the singlet, and
$\phi^*$ in Drell-Yan pair production. We derive a resummation formula valid up
to next-to-next-to-next-to-leading-logaritmic accuracy for the considered
observables. This formula reduces exactly to the customary resummation
performed in impact-parameter space in the known cases, and it also predicts
the correct power-behaved scaling of the cross section in the limit of small
value of the observable. We show how this formalism is efficiently implemented
by means of Monte Carlo techniques in a fully exclusive generator that allows
one to apply arbitrary cuts on the Born variables for any colour singlet, as
well as to automatically match the resummed results to fixed-order
calculations. As a phenomenological application, we present state-of-the-art
predictions for the Higgs-boson transverse-momentum spectrum at the LHC at
next-to-next-to-next-to-leading-logarithmic accuracy matched to fixed
next-to-next-to-leading order.Comment: Journal versio
Extra Higgs Boson and $Z'$ as Portals to Signatures of Heavy Neutrinos
  at the LHC

In this paper, we discuss the potential of observing heavy neutrino ($\nu_h$)
signatures of a $U(1)_{B-L}$ enlarged Standard Model (SM) encompassing three
heavy Majorana neutrinos alongside the known light neutrino states at the Large
Hadron Collider (LHC). We exploit the theoretical decay via a pair of heavy
(non-SM-like) Higgs boson and $Z'$ production followed by $\nu_h \rightarrow
l^\pm W^{\mp (*)}$ and $\nu_h \rightarrow \nu_l Z^{(*)}$ decays, ultimately
yielding a $3l+2j+E_{T}^{\rm{miss}}$ signature and, depending upon how boosted
the final state objects are, we define different possible selections aimed at
improving the signal to background ratio in LHC Run 2 data for a wide range of
heavy neutrino masses.Comment: 31 pages, 10 figures. arXiv admin note: text overlap with
  arXiv:1612.0597
Some semiclassical structure constants for AdS_4 x CP^3

We compute structure constants in three-point functions of three string
states in AdS_4 x CP^3 in the framework of the semiclassical approach. We
consider HHL correlation functions where two of the states are "heavy" string
states of finite-size giant magnons carrying one or two angular momenta and the
other one corresponds to such "light" states as dilaton operators with non-zero
momentum, primary scalar operators, and singlet scalar operators with higher
string levels.Comment: 19 pages; References added, typos fixe
Electroweak Precision Tests in High-Energy Diboson Processes

A promising avenue to perform precision tests of the SM at the LHC is to
measure differential cross-sections at high invariant mass, exploiting in this
way the growth with the energy of the corrections induced by heavy new physics.
We classify the leading growing-with-energy effects in longitudinal diboson and
in associated Higgs production processes, showing that they can be encapsulated
in four real "high-energy primary" parameters. We assess the reach on these
parameters at the LHC and at future hadronic colliders, focusing in particular
on the fully leptonic $WZ$ channel that appears particularly promising. The
reach is found to be superior to existing constraints by one order of
magnitude, providing a test of the SM electroweak sector at the per-mille
level, in competition with LEP bounds. Unlike LHC Run-1 bounds, which only
apply to new physics effects that are much larger than the SM in the
high-energy tail of the distributions, the probe we study applies to a wider
class of new physics scenarios where such large departures are not expected.Comment: 35 pages, 8 Figures, Fig.7 correcte
On the Scarcity of Weak Coupling in the String Landscape

We study the geometric requirements on a threefold base for the corresponding
F-theory compactification to admit a weakly-coupled type IIB limit. We examine
both the standard Sen limit and a more restrictive limit, and determine
conditions sufficient for their non-existence for both toric bases and more
general algebraic bases. In a large ensemble of geometries generated by base
changing resolutions we derive an upper bound on the frequency with which a
weak-coupling limit may occur, and find that such limits are extremely rare.
Our results sharply quantify the widely held notion that the vast number of
weakly-coupled IIB vacua is but a tiny fraction of the landscape.Comment: 30 pages, 10 figure
$T\bar{T}$-deformations, AdS/CFT and correlation functions

A solvable irrelevant deformation of AdS$_3$/CFT$_2$ correspondence leading
to a theory with Hagedorn spectrum at high energy has been recently proposed.
It consists of a single trace deformation of the boundary theory, which is
inspired by the recent work on solvable $T\bar{T}$ deformations of
two-dimensional CFTs. Thought of as a worldsheet $\sigma $-model, the
interpretation of the deformed theory from the bulk viewpoint is that of string
theory on a background that interpolates between AdS$_3$ in the IR and a linear
dilaton vacuum of little string theory in the UV. The insertion of the operator
that realizes the deformation in the correlation functions produces a
logarithmic divergence, leading to the renormalization of the primary
operators, which thus acquire an anomalous dimension. We compute this anomalous
dimension explicitly, and this provides us with a direct way of determining the
spectrum of the theory. We discuss this and other features of the correlation
functions in presence of the deformation.Comment: 17 pages. v3 references and comments added. Version to appear in JHE
Strong First Order EWPT and Strong Gravitational Waves in
  $Z_3$-symmetric Singlet Scalar Extension

The nature of electroweak (EW) phase transition (PT) is of great importance.
It may give a clue to the origin of baryon asymmetry if EWPT is strong first
order. Although it is second order within the standard model (SM), a great many
extensions of the SM are capable of altering the nature. Thus, gravitational
wave (GW), which is supposed to be relics of strong first order PT, is a good
complementary probe to new physics beyond SM (BSM). We in this paper elaborate
the patterns of strong first order EWPT in the next to simplest extension to
the SM Higgs sector, by introducing a $Z_3$-symmetric singlet scalar. We find
that, in the $Z_3$-symmetric limit, the tree level barrier could lead to strong
first order EWPT either via three or two-step PT. Moreover, they could produce
two sources of GW, despite of the undetectability from the first-step strong
first order PT for the near future GW experiments. But the other source with
significant supercooling which then gives rise to $\alpha\sim{\cal O}(0.1)$
almost can be wholly covered by future space-based GW interferometers such as
eLISA, DECIGO and BBO.Comment: references adde
Dual formulation of covariant nonlinear duality-symmetric action of
  kappa-symmetric D3-brane

We study the construction of covariant nonlinear duality-symmetric actions in
dual formulation. Essentially, the construction is the PST-covariantisation and
nonlinearisation of Zwanziger action. The covariantisation made use of three
auxiliary scalar fields. Apart from these, the construction proceed in a
similar way to that of the standard formulation. For example, the theories can
be extended to include interactions with external fields, and that the theories
possess two local PST symmetries. We then explicitly demonstrate the
construction of covariant nonlinear duality-symmetric actions in dual
formulation of DBI theory, and D3-brane. For each of these theories, the
twisted self-duality condition obtained from duality-symmetric actions are
explicitly shown to match with the duality relation between field strength and
its dual from the one-potential actions. Their on-shell actions between the
duality-symmetric and the one potential versions are also shown to match. We
also explicitly prove kappa-symmetry of the covariant nonlinear
duality-symmetric D3-brane action in dual formulation.Comment: 26 pages, typos corrected, references adde
Fibre Inflation and $\alpha$-attractors

Fibre inflation is a specific string theory construction based on the Large
Volume Scenario that produces an inflationary plateau. We outline its relation
to $\alpha$-attractor models for inflation, with the cosmological sector
originating from certain string theory corrections leading to $\alpha=2$ and
$\alpha=1/2$. Above a certain field range, the steepening effect of
higher-order corrections leads first to the breakdown of single-field slow-roll
and after that to the onset of 2-field dynamics: the overall volume of the
extra dimensions starts to participate in the effective dynamics. Finally, we
propose effective supergravity models of fibre inflation based on an
${\overline {D3}}$ uplift term with a nilpotent superfield. Specific moduli
dependent $\overline {D3}$ induced geometries lead to cosmological fibre models
but have in addition a de Sitter minimum exit. These supergravity models
motivated by fibre inflation are relatively simple, stabilize the axions and
disentangle the Hubble parameter from supersymmetry breaking.Comment: 24pages, 5 figures, v2: discussion on stringy corrections re-ordered
  and correcte
String corrections to circular Wilson loop and anomalies

We study string quantum corrections to the ratio of latitude and circular
Wilson loops in N=4 super-Yang-Mills theory at strong coupling. Conformal gauge
for the corresponding minimal surface in AdS(5)xS(5) is singular and we show
that an IR anomaly associated with the divergence in the conformal factor
removes previously reported discrepancy with the exact field-theory result. We
also carefully check conformal anomaly cancellation and recalculate fluctuation
determinants by directly evaluating phaseshifts for all the fluctuation modes.Comment: 26 pages, 3 figures; v2: minor misprints corrected, no changes in the
  equation
Model-independent analysis of the DAMPE excess

The Dark Matter Particle Explorer (DAMPE) recently released measurements of
the electron spectrum with a hint of a narrow peak at about 1.4 TeV. We
investigate dark matter (DM) models that could produce such a signal by
annihilation in a nearby subhalo whilst simultaneously satisfying constraints
from DM searches. In our model-independent approach, we consider all
renormalizable interactions via a spin 0 or 1 mediator between spin 0 or 1/2 DM
particles and the Standard Model leptons. We find that of the 20 combinations,
10 are ruled out by velocity or helicity suppression of the annihilation cross
section to fermions. The remaining 10 models, though, evade constraints from
the relic density, collider and direct detection searches, and include models
of spin 0 and 1/2 DM coupling to a spin 0 or 1 mediator. We delineate the
regions of mediator mass and couplings that could explain the DAMPE excess. In
all cases the mediator is required to be heaver than about 2 TeV by LEP limits.Comment: 28 pages, 5 figures and 2 tables. v2: references added. v3: minor
  changes, matches published versio
Tidal Stresses and Energy Gaps in Microstate Geometries

We compute energy gaps and study infalling massive geodesic probes in the new
families of scaling, microstate geometries that have been constructed recently
and for which the holographic duals are known. We find that in the deepest
geometries, which have the lowest energy gaps, the geodesic deviation shows
that the stress reaches the Planck scale long before the probe reaches the cap
of the geometry. Such probes must therefore undergo a stringy transition as
they fall into microstate geometry. We discuss the scales associated with this
transition and comment on the implications for scrambling in microstate
geometries.Comment: 22 pages, 1 figur
Perturbative Four-Point Functions from the Analytic Conformal Bootstrap

We apply the analytic conformal bootstrap method to study weakly coupled
conformal gauge theories in four dimensions. We employ twist conformal blocks
to find the most general form of the one-loop four-point correlation function
of identical scalar operators, without any reference to Feynman calculations.
The method relies only on symmetries of the model. In particular, it does not
require introducing any regularisation and it is free from the redundancies
usually associated with the Feynman approach. By supplementing the general
solution with known data for a small number of operators, we recover explicit
forms of one-loop correlation functions of four Konishi operators as well as of
four half-BPS operators $\mathcal{O}_{20'}$ in $\mathcal{N}=4$ super
Yang-Mills.Comment: 35 pages, 1 figur
Quantizing higher-spin gravity in free-field variables

We study the formulation of massless higher-spin gravity on AdS$_3$ in a
gauge in which the fundamental variables satisfy free field Poisson brackets.
This gauge choice leaves a small portion of the gauge freedom unfixed, which
should be further quotiented out. We show that doing so leads to a bulk version
of the Coulomb gas formalism for $W_N$ CFT's: the generators of the residual
gauge symmetries are the classical limits of screening charges, while the
gauge-invariant observables are classical $W_N$ charges. Quantization in these
variables can be carried out using standard techniques and makes manifest a
remnant of the triality symmetry of $W_\infty[\lambda]$. This symmetry can be
used to argue that the theory should be supplemented with additional matter
content which is precisely that of the Prokushkin-Vasiliev theory. As a further
application, we use our formulation to quantize a class of conical surplus
solutions and confirm the conjecture that these are dual to specific degenerate
$W_N$ primaries, to all orders in the large central charge expansion.Comment: 31 pages + appendices. V2: typos corrected, reference adde