pinecone/core-2020-05-10-deduplication huggingface dataset:
Non-custodial warped extra dimensions at the LHC?

With the prospect of improved Higgs measurements at the LHC and at proposed future colliders such as ILC, CLIC and TLEP we study the non-custodial Randall-Sundrum model with bulk SM fields and compare brane and bulk Higgs scenarios. The latter bear resemblance to the well studied type III two-Higgs-doublet models. We compute the electroweak precision observables and argue that incalculable contributions to these, in the form of higher dimensional operators, could have an impact on the T -parameter. This could potentially reduce the bound on the lowest Kaluza-Klein gauge boson masses to the 5 TeV range, making them detectable at the LHC. In a second part, we compute the misalignment between fermion masses and Yukawa couplings caused by vector-like Kaluza-Klein fermions in this setup. The misalignment of the top Yukawa can easily reach 10%, making it observable at the high-luminosity LHC. Corrections to the bottom and tau Yukawa couplings can be at the percent level and detectable at ILC, CLIC or TLEP
Inviolable energy conditions from entanglement inequalities

Via the AdS/CFT correspondence, fundamental constraints on the entanglement structure of quantum systems translate to constraints on spacetime geometries that must be satisfied in any consistent theory of quantum gravity. In this paper, we investigate such constraints arising from strong subadditivity and from the positivity and monotonicity of relative entropy in examples with highly-symmetric spacetimes. Our results may be interpreted as a set of energy conditions restricting the possible form of the stress-energy tensor in consistent theories of Einstein gravity coupled to matter
First moment of the flavour octet nucleon parton distribution function using lattice QCD

We perform a lattice computation of the flavour octet contribution to the average quark momentum in the nucleon, x μ 2 = 4 GeV 2 8 $$ {\left\langle x\right\rangle}_{\mu^2=4\kern0.5em {\mathrm{GeV}}^2}^{\left((8)\right.} $$ . In particular, we fully take the disconnected contributions into account in our analysis for which we use a generalization of the technique developed in [1]. We investigate systematic effects with particular emphasis on the excited states contamination. We find that in the renormalization free ratio x 3 x 8 $$ \frac{{\left\langle x\right\rangle}^{(3)}}{{\left\langle x\right\rangle}^{(8)}} $$ (with 〈x〉 (3) the non-singlet moment) the excited state contributions cancel to a large extent making this ratio a promising candidate for a comparison to phenomenological analyses. Our final result for this ratio is in agreement with the phenomenological value and we find, including systematic errors, x 3 x 8 = 0.39 1 4 $$ \frac{{\left\langle x\right\rangle}^{(3)}}{{\left\langle x\right\rangle}^{(8)}}=0.39(1)(4) $$
Limits on muon-neutrino to tau-neutrino oscillations induced by a
  sterile neutrino state obtained by OPERA at the CNGS beam

The OPERA experiment, exposed to the CERN to Gran Sasso $\nu_\mu$ beam,
collected data from 2008 to 2012. Four oscillated $\nu_\tau$ Charged Current
interaction candidates have been detected in appearance mode, which are
consistent with $\nu_\mu \to \nu_\tau$ oscillations at the atmospheric $\Delta
m^2$ within the "standard" three-neutrino framework. In this paper, the OPERA
$\nu_\tau$ appearance results are used to derive limits on the mixing
parameters of a massive sterile neutrino.Comment: 11 pages, 4 figures; reference to Planck result updated in the
  Introduction. Submitted to JHE
Simultaneous B and L violation: new signatures from RPV-SUSY

Studies of R-parity violating (RPV) supersymmetry typically assume that nucleon stability is protected by approximate baryon number (B) or lepton number (L) conservation. We present a new class of RPV models that violate B and L simultaneously (BLRPV), without inducing rapid nucleon decay. These models feature an approximate Z 2 × Z 2 × Z 2 flavorsymmetry,whichforbids2-bodynucleondecayandensuresthatflavor antisymmetric LLE c couplings are the only non-negligible L-violating operators. Nucleons are predicted to decay through N → Keμν and n → eμ ν; the resulting bounds on RPV couplings are rather mild. Novel collider phenomenology arises because the superpartners can decay through both L-violating and B-violating couplings. This can lead to, for example, final states with high jet multiplicity and multiple leptons of different flavor, or a spectrum in which depending on the superpartner, either B or L violating decays dominate. BLRPV can also provide a natural setting for displaced ν → μe decays, which evade many existing collider searches for RPV supersymmetry
Lessons from crossing symmetry at large N

We consider the four-point correlator of the stress tensor multiplet in N = 4 $$ \mathcal{N}=4 $$ SYM. We construct all solutions consistent with crossing symmetry in the limit of large central charge c ∼ N 2 and large g 2 N . While we find an infinite tower of solutions, we argue most of them are suppressed by an extra scale Δ gap and are consistent with the upper bounds for the scaling dimension of unprotected operators observed in the numerical superconformal bootstrap at large central charge. These solutions organize as a double expansion in 1/ c and 1/Δ gap . Our solutions are valid to leading order in 1/ c and to all orders in 1/Δ gap and reproduce, in particular, instanton corrections previously found. Furthermore, we find a connection between such upper bounds and positivity constraints arising from causality in flat space. Finally, we show that certain relations derived from causality constraints for scattering in AdS follow from crossing symmetry
Worldsheet geometries of ambitwistor string

Mason and Skinner proposed the ambitwistor string theory which directly reproduces the formulas for the amplitudes of massless particles proposed by Cachazo, He and Yuan. In this paper we discuss geometries of the moduli space of worldsheets associated to the bosonic or the RNS ambitwistor string. Further, we investigate the factorization properties of the amplitudes when an internal momentum is near on-shell in the abstract CFT language. Along the way, we propose the existence of the ambitwistor strings with three or four fermionic worldsheet currents
Soft theorems from effective field theory

The singular limits of massless gauge theory amplitudes are described by an effective theory, called soft-collinear effective theory (SCET), which has been applied most successfully to make all-orders predictions for observables in collider physics and weak decays. At tree-level, the emission of a soft gauge boson at subleading order in its energy is given by the Low-Burnett-Kroll theorem, with the angular momentum operator acting on a lower-point amplitude. For well separated particles at tree-level, we prove the Low-Burnett-Kroll theorem using matrix elements of subleading SCET Lagrangian and operator insertions which are individually gauge invariant. These contributions are uniquely determined by gauge invariance and the reparametrization invariance (RPI) symmetry of SCET. RPI in SCET is connected to the infinite-dimensional asymptotic symmetries of the S-matrix. The Low-Burnett-Kroll theorem is generically spoiled by on-shell corrections, including collinear loops and collinear emissions. We demonstrate this explicitly both at tree-level and at one-loop. The effective theory correctly describes these configurations, and we generalize the Low-Burnett-Kroll theorem into a new one-loop subleading soft theorem for amplitudes . Our analysis is presented in a manner that illustrates the wider utility of using effective theory techniques to understand the perturbative S-matrix
5d E n Seiberg-Witten curve via toric-like diagram

We consider 5d Sp(1) gauge theory with E N f + 1 $$ {E}_N{{}_{{}_f}}_{{}_{+1}} $$ global symmetries based on toric(-like) diagram constructed from ( p, q )-web with 7-branes. We propose a systematic procedure to compute the Seiberg-Witten curve for generic toric-like diagram. For N f = 6 , 7 flavors, we explicitly compute the Seiberg-Witten curves for 5d Sp(1) gauge theory, and show that these Seiberg-Witten curves agree with already known E 7 , 8 results. We also discuss a generalization of the Seiberg-Witten curve to rank- N cases
Method for an unbinned measurement of the $q^2$ dependent decay
  amplitudes of $\bar{B}^{0}\to \bar{K}^{*0}\mu^+\mu^-$ decays

A method for determining the $q^2$ dependent $\bar{K}^{*0}$ spin amplitudes
of $\bar{B}^{0}\to \bar{K}^{*0}\mu^+\mu^-$ decays through a maximum likelihood
fit to data is presented. While current experimental techniques extract a
limited set of observables in bins of $q^2$, our approach allows for the
determination of all observable quantities as continuous distributions in
$q^2$. By doing this, the method eliminates the need to correct theory
predictions of these observables for $q^2$ averaging effects, thus increasing
the sensitivity to the effects of physics beyond the Standard Model. Accounting
for the symmetries of the angular distribution and using a three parameter
ansatz for the $q^2$ dependence of the amplitudes, the precision of the angular
observables and the sensitivity to new physics is estimated using simulated
events. These studies are based on the sample sizes collected by the LHCb
experiment during Run-I and expected for Run-II.Comment: 24 pages, 9 figure
Exceptional field theory: $SO(5,5)$

We construct Exceptional Field Theory for the group $SO(5,5)$ based on the
extended (6+16)-dimensional spacetime, which after reduction gives the maximal
$D=6$ supergravity. We present both a true action and a duality-invariant
pseudo-action formulations. All the fields of the theory depend on the complete
extended spacetime. The U-duality group $SO(5,5)$ is made a geometric symmetry
of the theory by virtue of introducing the generalised Lie derivative that
incorporates a local duality transformation. Tensor hierarchy appears as a
natural consequence of the algebra of generalised Lie derivatives that are
viewed as gauge transformations. Upon truncating different subsets of the extra
coordinates, maximal supergravities in $D=11$ and $D=10$ (type IIB) can be
recovered from this theory.Comment: 33 pages + Appendi
Non-commutativity and non-associativity of the doubled string in
  non-geometric backgrounds

We use a T-duality invariant action to investigate the behaviour of a string
in non-geometric backgrounds, where there is a non-trivial global $O(D,D)$
patching or monodromy. This action leads to a set of Dirac brackets describing
the dynamics of the doubled string, with these brackets determined only by the
monodromy. This allows for a simple derivation of non-commutativity and
non-associativity in backgrounds which are (even locally) non-geometric. We
focus here on the example of the three-torus with H-flux, finding
non-commutativity but not non-associativity, and also comment on the relation
to the exotic $5^2_2$ brane, which shares the same monodromy.Comment: 31 pages, v2: refs added, corrections to sec 5, results updated, v3:
  published version with additional discussion in sec
Off-shell effects in Higgs processes at a linear collider and
  implications for the LHC

The importance of off-shell contributions is discussed for $H\to VV^{(*)}$
with $V\in\{Z,W\}$ for large invariant masses $m_{VV}$ involving a standard
model (SM)-like Higgs boson with $m_H=125$GeV at a linear collider (LC). Both
dominant production processes $e^+e^-\to ZH\to ZVV^{(*)}$ and
$e^+e^-\to\nu\bar\nu H\to\nu\bar\nu VV^{(*)}$ are taken into account, and the
signal processes are compared with background yielding the same final state.
The relative size of the off-shell contributions is strongly dependent on the
centre-of-mass energy. These contributions can have an important impact on the
determination of cross sections and branching ratios. However, the combination
of on- and off-shell contributions can also be utilised to lift degeneracies
allowing to test higher-dimensional operators, unitarity and light and heavy
Higgs interferences in extended Higgs sectors. The latter is demonstrated in
the context of a 2-Higgs-Doublet model. We also discuss the impact of these
aspects for the Large Hadron Collider (LHC) where they are relevant. The
importance of a precise measurement of the Higgs mass for on-shell
contributions in $H\to VV^{(*)}$ is emphasized. A particular focus is put on
methods for extracting the Higgs width at a LC. Off-shell contributions are
shown to have a negligible impact on the width determination at low $\sqrt{s}$
when applying the $Z$ recoil method to extract branching ratios in combination
with an appropriate determination of a partial width. On the other hand,
off-shell contributions can be exploited to constrain the Higgs width in a
similar fashion as in recent analyses at the LHC. It is demonstrated that this
approach, besides relying heavily on theoretical assumptions, is affected by
the negative interference of Higgs and background contributions that may limit
the sensitivity that is achievable with the highest foreseeable statistics at
the LHC and a LC.Comment: 33 pages, 15 figures; minor clarifications, updated references,
  matches published versio
Vacua and correlators in hyperbolic de Sitter space

We study the power - and bi -spectrum of vacuum fluctuations in a hyperbolic
section of de Sitter space, comparing two states of physical interest: the
Bunch-Davies and hyperbolic vacuum. We introduce a one -parameter family of de
Sitter hyperbolic sections and their natural vacua, and identify a limit in
which it reduces to the planar section and the corresponding Bunch -Davies
vacuum state. Selecting the Bunch -Davies vacuum for a massless scalar field
implies a mixed reduced density matrix in a hyperbolic section of de Sitter
space. We stress that in the Bunch -Davies state the hyperbolic de Sitter
$n$-point correlation functions have to match the planar de Sitter $n$-point
correlation functions. The expressions for the planar and hyperbolic Bunch
-Davies correlation functions only appear different because of the
transformation from planar to hyperbolic coordinates. Initial state induced
deviations from the standard inflationary predictions are instead obtained by
considering the pure hyperbolic vacuum, as we verify explicitly by computing
the power - and bi -spectrum. For the bi -spectrum in the hyperbolic vacuum we
find that the corrections as compared to the standard Bunch -Davies result are
not enhanced in specific momentum configurations and strongly suppressed for
momenta large compared to the hyperbolic curvature scale. We close with some
final remarks, in particular regarding the implications of these results for
more realistic inflationary bubble scenarios.Comment: Added references, removed typos, added author, extensions in first
  section and conclusions. 34 pages, 4 figure
Ultraspinning limits and super-entropic black holes

By employing the new ultraspinning limit we construct novel classes of black
holes with non-compact event horizons and finite horizon area and study their
thermodynamics. Our ultraspinning limit can be understood as a simple
generating technique that consists of three steps: i) transforming the known
rotating AdS black hole solution to a special coordinate system that rotates
(in a given 2-plane) at infinity ii) boosting this rotation to the speed of
light iii) compactifying the corresponding azimuthal direction. In so doing we
qualitatively change the structure of the spacetime since it is no longer
possible to return to a frame that does not rotate at infinity. The obtained
black holes have non-compact horizons with topology of a sphere with two
punctures. The entropy of some of these exceeds the maximal bound implied by
the reverse isoperimetric inequality, such black holes are super-entropic.Comment: 19 pages, 6 figures; minor corrections as in published version,
  updated reference
Gaugino Condensation and the Cosmological Constant

The existence of de Sitter solutions in string theory is strongly constrained
by no-go theorems. We continue our investigation of corrections to the
heterotic effective action, with the aim of either strengthening or evading the
these constraints. We consider the combined effects of H-flux, gauge bundles,
higher derivative corrections and gaugino condensation. The only consistent
solutions we find with maximal symmetry in four dimensions are Minkowski
spacetimes, ruling out both de Sitter and anti-de Sitter solutions constructed
from these ingredients alone.Comment: 21 pages; minor clarifications and references adde
A surprising relation for the effective coupling constants of N = 2 super Yang-Mills theories

We show that the effective coupling constants τ of supersymmetric gauge theories described by hyperelliptic curves do not distinguish between the lattices of the two kinds of heterotic string. In particular, the following relation Θ D 16 + τ = Θ E 8 2 τ $$ {\varTheta}_{D_{16}^{+}}\left(\tau \right)={\varTheta}_{E_8}^2\left(\tau \right) $$ holds. This is reminiscent of the relation, by T -duality, of the two heterotic strings. We suggest that such a relation extends to all curves describing effective supersymmetric gauge theories
Perturbative charm production and the prompt atmospheric neutrino flux
  in light of RHIC and LHC

We re-evaluate the prompt atmospheric neutrino flux, using the measured charm
cross sections at RHIC and the Large Hadron Collider to constrain perturbative
QCD parameters such as the factorization and renormalization scales, as well as
modern parton distribution functions and recent estimates of the cosmic-ray
spectra. We find that our result for the prompt neutrino flux is lower than
previous perturbative QCD estimates and, consequently, alters the
signal-to-background statistics of the recent IceCube measurements at high
energies.Comment: 19 pages, 8 figures, Published versio
Towards unity of families: anti-SU(7) from Z(12-I) orbifold
  compactification

The problem of families, "Why are there three families of fermions?", is a
long awaited question to be answered within a reasonable framework. We propose
anti-SU($N$) groups for the unification of families in grand unification (GUT)
groups, where the separation of color and weak gauge groups in the GUT is
achieved by antisymmetric tensor Brout-Englert-Higgs boson instead of an
adjoint representation. Theories of anti-SU($N$)'s are proposed for the
unification of families. The minimal model is found as \antiSD \, GUT with the
fermion representation [3]+2[2]+8[\bar-1]. We present an example in a Z(12-I)
orbifold compactification, where the missing partner mechanism is also
realized.Comment: 24 page
Differential branching fraction and angular analysis of $\Lambda^{0}_{b} \rightarrow \Lambda \mu^+\mu^-$ decays

The differential branching fraction of the rare decay $\Lambda^{0}_{b} \rightarrow \Lambda \mu^+\mu^-$ is measured as a function of $q^{2}$, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of $3.0 \mbox{ fb}^{-1}$, collected by the LHCb experiment. Evidence of signal is observed in the $q^2$ region below the square of the $J/\psi$ mass. Integrating over $15 < q^{2} < 20 \mbox{ GeV}^2/c^4$ the branching fraction is measured as $d\mathcal{B}(\Lambda^{0}_{b} \rightarrow \Lambda \mu^+\mu^-)/dq^2 = (1.18 ^{+0.09} _{-0.08} \pm 0.03 \pm 0.27) \times 10^{-7} ( \mbox{GeV}^{2}/c^{4})^{-1}$, where the uncertainties are statistical, systematic and due to the normalisation mode, $\Lambda^{0}_{b} \rightarrow J/\psi \Lambda$, respectively. In the $q^2$ intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon ($A^{l}_{\rm FB}$) and hadron ($A^{h}_{\rm FB}$) systems are measured for the first time. In the range $15 < q^2 < 20 \mbox{ GeV}^2/c^4$ they are found to be $A^{l}_{\rm FB} = -0.05 \pm 0.09 \mbox{ (stat)} \pm 0.03 \mbox{ (syst)}$ and $A^{h}_{\rm FB} = -0.29 \pm 0.07 \mbox{ (stat)} \pm 0.03 \mbox{ (syst)}$
Radiative PQ Breaking and the Higgs Boson Mass

The small and negative value of the Standard Model Higgs quartic coupling at
high scales can be understood in terms of anthropic selection on a landscape
where large and negative values are favored: most universes have a very
short-lived electroweak vacuum and typical observers are in universes close to
the corresponding metastability boundary. We provide a simple example of such a
landscape with a Peccei-Quinn symmetry breaking scale generated through
dimensional transmutation and supersymmetry softly broken at an intermediate
scale. Large and negative contributions to the Higgs quartic are typically
generated on integrating out the saxion field. Cancellations among these
contributions are forced by the anthropic requirement of a sufficiently
long-lived electroweak vacuum, determining the multiverse distribution for the
Higgs quartic in a similar way to that of the cosmological constant. This leads
to a statistical prediction of the Higgs boson mass that, for a wide range of
parameters, yields the observed value within the 1$\sigma$ statistical
uncertainty of $\sim$ 5 GeV originating from the multiverse distribution. The
strong CP problem is solved and single-component axion dark matter is
predicted, with an abundance that can be understood from environmental
selection. A more general setting for the Higgs mass prediction is discussed.Comment: 30 pages, 10 figures; v2, JHEP versio
Simple Recursion Relations for General Field Theories

On-shell methods offer an alternative definition of quantum field theory at
tree-level, replacing Feynman diagrams with recursion relations and interaction
vertices with a handful of seed scattering amplitudes. In this paper we
determine the simplest recursion relations needed to construct a general
four-dimensional quantum field theory of massless particles. For this purpose
we define a covering space of recursion relations which naturally generalizes
all existing constructions, including those of BCFW and Risager. The validity
of each recursion relation hinges on the large momentum behavior of an n-point
scattering amplitude under an m-line momentum shift, which we determine solely
from dimensional analysis, Lorentz invariance, and locality. We show that all
amplitudes in a renormalizable theory are 5-line constructible. Amplitudes are
3-line constructible if an external particle carries spin or if the scalars in
the theory carry equal charge under a global or gauge symmetry. Remarkably,
this implies the 3-line constructibility of all gauge theories with fermions
and complex scalars in arbitrary representations, all supersymmetric theories,
and the standard model. Moreover, all amplitudes in non-renormalizable theories
without derivative interactions are constructible; with derivative
interactions, a subset of amplitudes is constructible. We illustrate our
results with examples from both renormalizable and non-renormalizable theories.
Our study demonstrates both the power and limitations of recursion relations as
a self-contained formulation of quantum field theory.Comment: 27 pages and 2 figures; v2: typos corrected to match journal versio
Type-II super-Backlund transformation and integrable defects for the N=1
  super sinh-Gordon model

A new super-Backlund transformation for the N=1 supersymmetric sinh-Gordon
equation is constructed. Based on this construction we propose a type-II
integrable defect for the supersymmetric sinh-Gordon model consistent with this
new transformation through the Lagrangian formalism. Explicit expressions for
the modified conserved energy, momentum and supercharges are also computed. In
addition, we show for the model that the type-II defect can also been regarded
as a pair of fused defects of a previously introduced type. The explicit
derivation of the associated defect matrices is also presented as a necessary
condition for the integrability of the model.Comment: Latex 31 pages. Version accepted for publicatio