pinecone/core-2020-05-10-deduplication huggingface dataset:
Recursion relations from soft theorems

We establish a set of new on-shell recursion relations for amplitudes
satisfying soft theorems. The recursion relations can apply to those amplitudes
whose additional physical inputs from soft theorems are enough to overcome the
bad large-z behaviour. This work is a generalization of the recursion relations
recently obtained by Cheung et al for amplitudes in scalar effective field
theories with enhanced vanishing soft behaviours, which can be regarded as a
special case of those with non-vanishing soft limits. We apply the recursion
relations to tree-level amplitudes in various theories, including amplitudes in
the Akulov-Volkov theory, amplitudes containing dilatons of
spontaneously-broken conformal symmetry.Comment: 21 pages, typos and some statements modified, references adde
Sensitivities of Prospective Future e+e- Colliders to Decoupled New
  Physics

We explore the indirect sensitivities to decoupled new physics of prospective
precision electroweak measurements, triple-gauge-coupling measurements and
Higgs physics at future $e^+e^-$ colliders, with emphasis on the ILC250 and
FCC-ee. The Standard Model effective field theory (SM EFT) is adopted as a
model-independent approach for relating experimental precision projections to
the scale of new physics, and we present prospective constraints on the Wilson
coefficients of dimension-6 operators. We find that in a marginalised fit
ILC250 EWPT measurements may be sensitive to new physics scales $\Lambda =
\mathcal{O}(10)$~TeV, and FCC-ee EWPT measurements may be sensitive to $\Lambda
= \mathcal{O}(30)$~TeV. The prospective sensitivities of Higgs and TGC
measurements at the ILC250 (FCC-ee) are to $\Lambda = \mathcal{O}(1)$~TeV
($\Lambda = \mathcal{O}(2)$~TeV).Comment: 19 page
Non-linear gauge transformations in $D=10$ SYM theory and the BCJ
  duality

Recent progress on scattering amplitudes in super Yang--Mills and superstring
theory benefitted from the use of multiparticle superfields. They universally
capture tree-level subdiagrams, and their generating series solve the
non-linear equations of ten-dimensional super Yang--Mills. We provide
simplified recursions for multiparticle superfields and relate them to earlier
representations through non-linear gauge transformations of their generating
series. In this work we discuss the gauge transformations which enforce their
Lie symmetries as suggested by the Bern-Carrasco-Johansson duality between
color and kinematics. Another gauge transformation due to Harnad and Shnider is
shown to streamline the theta-expansion of multiparticle superfields, bypassing
the need to use their recursion relations beyond the lowest components. The
findings of this work tremendously simplify the component extraction from
kinematic factors in pure spinor superspace.Comment: harvmac TeX, 35 pages, v2: published versio
A Composite Model for the 750 GeV Diphoton Excess

We study a simple model in which the recently reported 750 GeV diphoton
excess arises from a composite pseudo Nambu-Goldstone boson---hidden
pion---produced by gluon fusion and decaying into two photons. The model only
introduces an extra hidden gauge group at the TeV scale with a vectorlike quark
in the bifundamental representation of the hidden and standard model gauge
groups. We calculate the masses of all the hidden pions and analyze their
experimental signatures and constraints. We find that two colored hidden pions
must be near the current experimental limits, and hence are probed in the near
future. We study physics of would-be stable particles---the composite states
that do not decay purely by the hidden and standard model gauge dynamics---in
detail, including constraints from cosmology. We discuss possible theoretical
structures above the TeV scale, e.g. conformal dynamics and supersymmetry, and
their phenomenological implications. We also discuss an extension of the
minimal model in which there is an extra hidden quark that is singlet under the
standard model and has a mass smaller than the hidden dynamical scale. This
provides two standard model singlet hidden pions that can both be viewed as
diphoton/diboson resonances produced by gluon fusion. We discuss several
scenarios in which these (and other) resonances can be used to explain various
excesses seen in the LHC data.Comment: 22 pages, 10 figures; factors in eqs. (10) and (20) correcte
Nilpotent chiral superfield in N=2 supergravity and partial rigid
  supersymmetry breaking

In the framework of N=2 conformal supergravity in four dimensions, we
introduce a nilpotent chiral superfield suitable for the description of partial
supersymmetry breaking in maximally supersymmetric spacetimes. As an
application, we construct Maxwell-Goldstone multiplet actions for partial N=2
--> N=1 supersymmetry breaking on R x S^3, AdS_3 x S^1 (or its covering AdS_3 x
R), and a pp-wave spacetime. In each of these cases, the action coincides with
a unique curved-superspace extension of the N=1 supersymmetric Born-Infeld
action, which is singled out by the requirement of U(1) duality invariance.Comment: 21 pages; V2: comments, references, and a new appendix added (28
  pages); V3: published versio
Semicontinuity of 4d N=2 spectrum under renormalization group flow

We study renormalization group flow of four dimensional N=2 SCFTs defined by
isolated hypersurface three-fold singularities. We define the spectrum of N=2
theory as the set of scaling dimensions of the parameters on the Coulomb
branch, which include Coulomb branch moduli, mass parameters and coupling
constants. We prove that the spectrum of those theories is semicontinous under
the RG flow on the Coulomb branch using the mathematical result about the
singularity spectra under deformation. The semicontinuity behavior of N=2
spectrum implies a theorem under relevant and Coulomb branch moduli
deformation, the absence of dangerous irrelevant deformations and can be taken
as the necessary condition for the ending point of a RG flow. This behavior is
also true for (c,c) ring deformation of two dimensional Landau-Ginzburg model
with (2,2) supersymmetry.Comment: 12 page
Sudakov Resummations in Mueller-Navelet Dijet Production

In high energy hadron-hadron collisions, dijet production with large rapidity
separation proposed by Mueller and Navelet, is one of the most interesting
processes which can help us to directly access the well-known
Balitsky-Fadin-Kuraev-Lipatov evolution dynamics. The objective of this work is
to study the Sudakov resummation of Mueller-Navelet jets. Through the one-loop
calculation, Sudakov type logarithms are obtained for this process when the
produced dijets are almost back-to-back. These results could play an important
role in the phenomenological study of dijet correlations with large rapidity
separation at the LHC.Comment: 20 pages, 5 figures; v2, refs adde
Berends-Giele recursions and the BCJ duality in superspace and
  components

The recursive method of Berends and Giele to compute tree-level gluon
amplitudes is revisited using the framework of ten-dimensional super
Yang-Mills. First we prove that the pure spinor formula to compute SYM tree
amplitudes derived in 2010 reduces to the standard Berends-Giele formula from
the 80s when restricted to gluon amplitudes and additionally determine the
fermionic completion. Second, using BRST cohomology manipulations in
superspace, alternative representations of the component amplitudes are
explored and the Bern-Carrasco-Johansson relations among partial tree
amplitudes are derived in a novel way. Finally, it is shown how the
supersymmetric components of manifestly local BCJ-satisfying tree-level
numerators can be computed in a recursive fashion.Comment: harvmac TeX, 24 pages, v2: published version with an additional typo
  fix in equation (4.21
Same-Sign Dilepton Excesses and Vector-like Quarks

Multiple analyses from ATLAS and CMS collaborations, including searches for
ttH production, supersymmetric particles and vector-like quarks, observed
excesses in the same-sign dilepton channel containing b-jets and missing
transverse energy in the LHC Run 1 data. In the context of little Higgs
theories with T parity, we explain these excesses using vector-like T-odd
quarks decaying into a top quark, a W boson and the lightest T-odd particle
(LTP). For heavy vector-like quarks, decay topologies containing the LTP have
not been searched for at the LHC. The bounds on the masses of the T-odd quarks
can be estimated in a simplified model approach by adapting the search limits
for top/bottom squarks in supersymmetry. Assuming a realistic decay branching
fraction, a benchmark with a 750 GeV T-odd b-prime quark is proposed. We also
comment on the possibility to fit excesses in different analyses in a common
framework.Comment: 1+17 pages and 11 figure
Probing the top-quark width through ratios of resonance contributions of
  $e^+e^-\rightarrow W^+W^-b\bar{b}$

We exploit offshell regions in the process $e^+e^-\rightarrow W^+W^-b\bar{b}$
to gain access to the top-quark width. Working at next-to-leading order in QCD
we show that carefully selected ratios of offshell regions to onshell regions
in the reconstructed top and antitop invariant mass spectra are,
\emph{independently} of the coupling $g_{tbW}$, sensitive to the top-quark
width. We explore this approach for different centre of mass energies and
initial-state beam polarisations at $e^+e^-$ colliders and briefly comment on
the applicability of this method for a measurement of the top-quark width at
the LHC.Comment: 31 pages, 10 figures, 2 table
Equation of state for cold and dense heavy QCD

A previously derived three-dimensional effective lattice theory describing
the thermodynamics of QCD with heavy quarks in the cold and dense region is
extended through order $\sim u^5\kappa^8$ in the combined character and hopping
expansion of the original four-dimensional Wilson action. The systematics of
the effective theory is investigated to determine its range of validity in
parameter space. We demonstrate the severe cut-off effects due to lattice
saturation, which afflict any lattice results at finite baryon density
independent of the sign problem or the quality of effective theories, and which
have to be removed by continuum extrapolation. We then show how the effective
theory can be solved analytically by means of a linked cluster expansion, which
is completely unaffected by the sign problem, in quantitative agreement with
numerical simulations. As an application, we compute the cold nuclear equation
of state of heavy QCD. Our continuum extrapolated result is consistent with a
polytropic equation of state for non-relativistic fermions.Comment: 30 pages, 16 figure; figures updated for readability, caption fig 10
  update
TBA-like integral equations from quantized mirror curves

Quantizing the mirror curve of certain toric Calabi-Yau (CY) three-folds
leads to a family of trace class operators. The resolvent function of these
operators is known to encode topological data of the CY. In this paper, we show
that in certain cases, this resolvent function satisfies a system of non-linear
integral equations whose structure is very similar to the Thermodynamic Bethe
Ansatz (TBA) systems. This can be used to compute spectral traces, both exactly
and as a semiclassical expansion. As a main example, we consider the system
related to the quantized mirror curve of local $\mathbb P^2$. According to a
recent proposal, the traces of this operator are determined by the refined BPS
indices of the underlying CY. We use our non-linear integral equations to test
that proposal.Comment: 30 pages, 1 figure, 1 table; v2: minor correction
Decoupling of gravity on non-susy D$p$ branes

We study the graviton scattering in the background of non-susy D$p$ branes of
type II string theories consisting of a metric, a dilaton and a $(p+1)$ form
gauge field. We show numerically that in these backgrounds graviton experiences
a scattering potential which takes the form of an infinite barrier in the low
energy (near brane) limit for $p\leq 5$ and therefore is never able to reach
the branes. This shows, contrary to what is known in the literature, that
gravity indeed decouples from the non-susy D$p$ branes for $p \leq 5$. For
non-susy D6 brane, gravity couples as there is no such barrier for the
potential. To give further credence to our claim we solve the scattering
equation in some situation analytically and calculate the graviton absorption
cross-sections on the non-susy branes and show that they vanish for $p \leq 4$
in the low energy limit. This shows, as in the case of BPS branes, that gravity
does decouple for non-susy D$p$ branes for $p\leq 4$ but it does not decouple
for D6 brane as the potential here is always attractive. We argue for the
non-susy D5 brane that depending on one of the parameters of the solution
gravity either always decouples (unlike the BPS D5 brane) or it decouples when
the energy of the graviton is below certain critical value, otherwise it
couples, very similar to BPS D5 brane.Comment: 20 pages, 3 figures; v2: revised for more clarity and more refs.
  added; v3: first part is thoroughly revised and a section added, more
  clarifications and refs added, main results unchanged, version to appear in
  JHE
Gauge Mediated Mini-Split

We propose a simple model of split supersymmetry from gauge mediation. This
model features gauginos that are parametrically a loop factor lighter than
scalars, accommodates a Higgs boson mass of 125 GeV, and incorporates a simple
solution to the $\mu-b_\mu$ problem. The gaugino mass suppression can be
understood as resulting from collective symmetry breaking. Imposing collider
bounds on $\mu$ and requiring viable electroweak symmetry breaking implies
small $a$-terms and small $\tan \beta$ -- the stop mass ranges from $10^5$ to
$10^8 \mbox{ GeV}$. In contrast with models with anomaly + gravity mediation
(which also predict a one-loop loop suppression for gaugino masses), our gauge
mediated scenario predicts aligned squark masses and a gravitino LSP. Gluinos,
electroweakinos and Higgsinos can be accessible at the LHC and/or future
colliders for a wide region of the allowed parameter space.Comment: 16 pages, 1 figure. Journal version, references adde
On the Hamiltonian integrability of the bi-Yang-Baxter sigma-model

The bi-Yang-Baxter sigma-model is a certain two-parameter deformation of the
principal chiral model on a real Lie group G for which the left and right
G-symmetries of the latter are both replaced by Poisson-Lie symmetries. It was
introduced by C. Klimcik who also recently showed it admits a Lax pair, thereby
proving it is integrable at the Lagrangian level. By working in the Hamiltonian
formalism and starting from an equivalent description of the model as a
two-parameter deformation of the coset sigma-model on G x G / G_diag, we show
that it also admits a Lax matrix whose Poisson bracket is of the standard
r/s-form characterised by a twist function which we determine. A number of
results immediately follow from this, including the identification of certain
complex Poisson commuting Kac-Moody currents as well as an explicit description
of the q-deformed symmetries of the model. Moreover, the model is also shown to
fit naturally in the general scheme recently developed for constructing
integrable deformations of sigma-models. Finally, we show that although the
Poisson bracket of the Lax matrix still takes the r/s-form after fixing the
G_diag gauge symmetry, it is no longer characterised by a twist function.Comment: 26 pages, 1 figur
Multipole Expansion in the Quantum Hall Effect

The effective action for low-energy excitations of Laughlin's states is
obtained by systematic expansion in inverse powers of the magnetic field. It is
based on the W-infinity symmetry of quantum incompressible fluids and the
associated higher-spin fields. Besides reproducing the Wen and Wen-Zee actions
and the Hall viscosity, this approach further indicates that the low-energy
excitations are extended objects with dipolar and multipolar moments.Comment: 29 pages, 5 figures; v2: comments and references adde
Naturally Large Radiative Lepton Flavor Violating Higgs Decay Mediated
  by Lepton-flavored Dark Matter

In the standard model (SM), lepton flavor violating (LFV) Higgs decay is
absent at renormalizable level and thus it is a good probe to new physics. In
this article we study a type of new physics that could lead to large LFV Higgs
decay, i.e., a lepton-flavored dark matter (DM) model which is specified by a
Majorana DM and scalar lepton mediators. Different from other similar models
with similar setup, we introduce both left-handed and right-handed scalar
leptons. They allow large LFV Higgs decay and thus may explain the tentative
Br$(h\ra\tau\mu)\sim1\%$ experimental results from the LHC. In particular, we
find that the stringent bound from $\tau\ra\mu\gamma$ can be naturally evaded.
One reason, among others, is a large chirality violation in the mediator
sector. Aspects of relic density and especially radiative direct detection of
the leptonic DM are also investigated, stressing the difference from previous
lepton-flavored DM models.Comment: 23 pages. JHEP version, fixing typos and now using a consistent
  notatio
On conformal supergravity and harmonic superspace

This paper describes a fully covariant approach to harmonic superspace. It is
based on the conformal superspace description of conformal supergravity and
involves extending the supermanifold M^{4|8} by the tangent bundle of CP^1. The
resulting superspace M^{4|8} x TCP^1 can be identified in a certain gauge with
the conventional harmonic superspace M^{4|8} x S^2. This approach not only
makes the connection to projective superspace transparent, but simplifies
calculations in harmonic superspace significantly by eliminating the need to
deal directly with supergravity prepotentials. As an application of the
covariant approach, we derive from harmonic superspace the full component
action for the sigma model of a hyperkahler cone coupled to conformal
supergravity. Further applications are also sketched.Comment: 61 pages; v2: reference added, minor changes; v3: references added,
  minor additional comments, published versio
A pseudoscalar decaying to photon pairs in the early LHC Run 2 data

In this paper we explore the possibility of a pseudoscalar resonance to
account for the 750 GeV diphoton excess observed both at ATLAS and at CMS. We
analyze the ingredients needed from the low energy perspective to obtain a
sufficiently large diphoton rate to explain the signal while avoiding
constraints from other channels. Additionally, we point out composite Higgs
models in which one can naturally obtain a pseudoscalar at the 750 GeV mass
scale and we estimate the pseudoscalar couplings to standard model particles
that one would have in such models. A generic feature of models that can
explain the excess is the presence of new particles in addition to the 750 GeV
state. Finally, we note that due to the origin of the coupling of the resonance
to photons, one expects to see comparable signals in the $Z\gamma$, $ZZ$, and
$WW$ channels.Comment: 26 pages, 7 figures, 3 tables; v2: updated tables, added 1 figure,
  fixed typos, added comment
Brane webs and $O5$-planes

We explore the properties of five-dimensional supersymmetric gauge theories
living on $5$-brane webs in orientifold $5$-plane backgrounds. This allows
constructing quiver gauge theories with alternating $USp(2N)$ and $SO(N)$ gauge
groups with fundamental matter, and thus leads to the existence of new $5d$
fixed point theories. The web description can be further used to study
non-perturbative phenomena such as enhancement of symmetry and duality. We
further suggest that one can use these systems to engineer $5d$ $SO$ group with
spinor matter. We present evidence for this claim.Comment: 40 pages, 34 figure
Scaling dimensions of monopole operators in the $\mathbb{CP}^{N_b - 1}$
  theory in $2+1$ dimensions

We study monopole operators at the conformal critical point of the
$\mathbb{CP}^{N_b - 1}$ theory in $2+1$ spacetime dimensions. Using the
state-operator correspondence and a saddle point approximation, we compute the
scaling dimensions of these operators to next-to-leading order in $1/N_b$. We
find remarkable agreement between our results and numerical studies of quantum
antiferromagnets on two-dimensional lattices with SU($N_b$) global symmetry,
using the mapping of the monopole operators to valence bond solid order
parameters of the lattice antiferromagnet.Comment: 29 pages + Appendices, 3 figures; v2 corrected an important minus
  sign error and made various improvement
Non-Abelian, supersymmetric black holes and strings in 5 dimensions

We construct and study the first supersymmetric black-hole and black-string
solutions of non-Abelian-gauged N=1,d=5 supergravity (N=1,d=5
Super-Einstein-Yang-Mills theory) with non-trivial SU(2) gauge fields: BPST
instantons for black holes and BPS monopoles of different kinds
('t~Hooft-Polyakov, Wu-Yang and Protogenov) for black strings and also for
certain black holes that are well defined solutions only for very specific
values of all the moduli. Instantons, as well as colored monopoles do not
contribute to the masses and tensions but do contribute to the entropies.
  The construction is based on the characterization of the supersymmetric
solutions of gauged N=1,d=5 supergravity coupled to vector multiplets achieved
in Ref. Bellorin:2007yp which we elaborate upon by finding the rules to
construct supersymmetric solutions with one additional isometry, both for the
timelike and null classes. These rules automatically connect the timelike and
null non-Abelian supersymmetric solutions of N=1,d=5 SEYM theory with the
timelike ones of N=2,d=4 SEYM theory by dimensional reduction and oxidation. In
the timelike-to-timelike case the singular Kronheimer reduction recently
studied in Ref. Bueno:2015wva plays a crucial role.Comment: 37 pages, no figure
D6-branes and axion monodromy inflation

We develop new scenarios of large field inflation in type IIA string
compactifications in which the key ingredient is a D6-brane that creates a
potential for a B-field axion. The potential has the multi-branched structure
typical of F-term axion monodromy models and, near its supersymmetric minima,
it is described by a 4d supergravity model of chaotic inflation with a
stabiliser field. The same statement applies to the D6-brane Wilson line, which
can also be considered as an inflaton candidate. We analyse both cases in the
context of type IIA moduli stabilisation, finding an effective potential for
the inflaton system and a simple mechanism to lower the inflaton mass with
respect to closed string moduli stabilised by fluxes. Finally, we compute the
B-field potential for trans-Planckian field values by means of the DBI action.
The effect of Planck suppressed corrections is a flattened potential which, in
terms of the compactification parameters, interpolates between linear and
quadratic inflation. This renders the cosmological parameters of these models
compatible with current experimental bounds, with the tensor-to-scalar ratio
ranging as 0.08 < r < 0.12Comment: typos corrected and refs. adde