bluuebunny/crossref_metadata_2025_split huggingface dataset:
Search for

K+→π+vv¯

at CERN
Authors: Kucerova Z 
Published: September 2020

Abstract
The decay

K
+

→

π
+

v

v
¯

, with a very precisely predicted branching ratio of less than 10−10, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the

K
+

→

π
+

v

v
¯

with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and 2018. Statistics collected in 2016 allows NA62 to reach the Standard Model sensitivity for

K
+

→

π
+

v

v
¯

, entering the domain of 10−10 single event sensitivity and showing the proof of principle of the experiment. The analysis data is reviewed and the preliminary result from the 2016 data set presented.
PT

-symmetric quantum field theory
Authors: Bender C M 
Published: September 2020

Abstract

PT

-symmetric quantum theory began with an analysis of the strange-looking non-Hermitian Hamiltonian H = p
2 + x (ix)ε. This Hamiltonian is

PT

symmetric and the eigenvalues Hamiltonian are discrete, real, and positive when ε ≥ 0. In this talk we describe the properties of the corresponding quantum-field-theoretic Hamiltonian

H
=

1
2

(

∇
ϕ

)

2

+

1
2

ϕ
2

(
i
ϕ
)

ε

in D-dimensional spacetime, where φ is a pseudoscalar field. We show how to calculate all of the Green’s functions as series in powers of ε directly from the Euclidean partition function. We derive exact finite expressions for the vacuum energy density, the renormalized mass, and the connected n-point Green’s functions for all n 0 ≤ D ≤ 2. For D ≥ 2 the one-point Green’s function and the renormalized mass become infinite, but perturbative renormalization can be performed. The beautiful spectral properties of

PT

-symmetric quantum mechanics appear to persist in

PT

-symmetric quantum field theory.
On the systematic construction of basis invariants
Authors: Trautner A 
Published: September 2020

Abstract
We describe a new, generally applicable strategy for the systematic construction of basis invariants (BIs). Our method allows one to count the number of mutually independent BIs and gives controlled access to the interrelations (syzygies) between mutually dependent BIs. Due to the novel use of orthogonal hermitian projection operators, we obtain the shortest possible invariants and their interrelations. The substructure of non-linear BIs is fully resolved in terms of linear, basis-covariant objects. The substructure distinguishes real (CP-even) and purely imaginary (CP-odd) BIs in a simple manner. As an illustrative example, we construct the full ring of BIs of the scalar potential of the general Two-Higgs-Doublet model.
Test of discrete symmetries in transitions with entangled neutral kaons at KLOE-2
Authors: De Santis A 
Published: September 2020

Abstract
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) completed its data-taking at the e
+
e
− DAΦNE collider, which implements an innovative collision scheme based on a crab-waist configuration, and achieved the integrated luminosity of more than 5 fb−1 . KLOE-2 represents the continuation of KLOE with an upgraded detector and an extended physics program which includes, among the main topics, neutral kaon interferometry and test of discrete symmetries . Entangled neutral kaon pairs produced at DAΦNE are a unique tool to test discrete symmetries and quantum coherence at the utmost sensitivity, strongly motivating the experimental searches of possible CPT violating effects, which would constitute an unambiguous signal of New Physics. The status of the test of Time reversal and CPT simmetry in

ϕ
→

K
S

K
L

→
π
v
,
3

π
0

,
(
2
π
)

decays with KLOE and KLOE-2 data will be discussed.
Chiral symmetry-breaking schemes and dynamical generation of masses and field mixing
Authors: Blasone M , Jizba P , Smaldone L 
Published: September 2020

Abstract
In this paper we review dynamical generation of field mixing after chiral symmetry breaking. We also study the explicit form of discrete transformations of flavor states in a two-flavor scalar model with field mixing. We find that CPT symmetry is spontaneously broken on flavor vacuum because of its dynamically generated condensate structure.
Disentangling genuine from matter-induced CP violation in neutrino oscillations
Authors: Segarra A , Bernabeu J 
Published: September 2020

Abstract
We prove [1] that, in any flavor transition, neutrino oscillation CP violating asymmetries in matter have two disentangled components: (a) a CPT-odd T-invariant term, non-vanishing iff there are interactions with matter; (b) a T-odd CPT-invariant term, non-vanishing iff there is genuine CP violation. As function of the baseline, these two terms are distinct L-even and L-odd observables, respectively. In the experimental region of terrestrial accelerator neutrinos, we calculate [2] their approximate expressions from which we prove that, at medium baselines, the CPT-odd component is small and nearly (δ-independent, so it can be subtracted from the experimental CP asymmetry as a theoretical background, provided the hierarchy is known. At long baselines, on the other hand, we find that (i) a Hierarchy-odd term in the CPT-odd component dominates the CP asymmetry for energies above the first oscillation node, and (ii) the CPT-odd term vanishes, independent of the CP phase δ, at E = 0.92 GeV(L/1300 km) near the second oscillation maximum, where the T-odd term is almost maximal and proportional to sin δ. A measurement of the CP asymmetry in these energy regions would thus provide separate information on (i) the neutrino mass ordering, and (ii) direct evidence of genuine CP violation in the lepton sector.
Leptogenesis in CPT violating backgrounds
Authors: Bossingham T 
Published: September 2020

Abstract
In a temperature dependent CPT-Violating (CPTV) axial time-like background (induced by the Kalb-Ramond tensor field of string theory) we discuss leptogenesis by solving the Boltzmann equation. The current work non-trivially modifies the framework of a previous phenomenological approach (where the author was involved) where the CPTV axial background was considered to be a constant. The constant background approximation is shown to capture the main phenomenological features of leptogenesis.
Spontaneous CP Violation and Scalar FCNC
Authors: Nebot M 
Published: September 2020

Abstract
A short overview of general aspects of Spontaneous CP Violation and Scalar Flavour Changing Neutral Couplings is presented. Then, a 2HDM where CP Violation has a spontaneous origin, including the generation of a realistic CKM matrix, and which has Scalar Flavour Changing Neutral Couplings of controlled intensity, is discussed. Phenomenological consequences such as the existence of new scalars with masses below 1 TeV, or the possibility of having flavour changing processes such as t → hc or h → bs within experimental reach, are explored.
High precision test of the Pauli Exclusion Principle for electrons
Authors: Piscicchia K , Amirkhani A , Bartalucci S , Bertolucci S , Bazzi M , Bragadireanu M , Cargnelli M , Clozza A , Curceanu C , Del Grande R , De Paolis L , Egger J , Fiorini C , Guaraldo C , Iliescu M , Laubenstein M , Marton J , Mazzocchi T , Miliucci M , Milotti E , Pichler A , Pietreanu D , Scordo A , Shi H , Laura Sirghi D , Sirghi F , Sperandio L , Vazquez Doce O , Veith M , Zmeskal J 
Published: September 2020

Abstract
The VIP collaboration is performing high precision tests of the Pauli Exclusion Principle for electrons in the extremely low cosmic background environment of the Underground Gran Sasso Laboratories of INFN (Italy). The experimental technique consists in introducing a DC current in a copper conductor, searching for the X-rays emission due to a PEP-forbidden atomic transition from the L shell to the K shell of copper when the K shell is already occupied by two electrons. VIP set un upper limit on the PEP violation probability

1
2

β
2

<
4.7
×

10

−
29

, the aim of the upgraded VIP-2 experiment is to improve this result by two orders of magnitude at least. The experimental setup and the results of preliminary data analyses will be presented.
SUSY discovery prospects with MoEDAL
Authors: Sakurai K , Felea D , Mamuzic J , Mavromatos N E , Mitsou V A , Pinfold J L , Ruiz de Austri R , Santra A , Vives O 
Published: September 2020

Abstract
We present a preliminary study on the possibility to search for massive long-lived electrically charged particles at the MoEDAL detector. MoEDAL is sensitive to highly ionising objects such as magnetic monopoles or massive (meta-)stable electrically charged particles and we focus on the latter in this paper. Requirements on triggering or reducing the cosmic-ray and cavern background, applied in the ATLAS and CMS analyses for long-lived particles, are not necessary at MoEDAL, due to its completely different detector design and extremely low background. On the other hand, MoEDAL requires slow-moving particles, resulting in sensitivity to massive states with typically small production cross sections. Using Monte Carlo simulations, we compare the sensitivities of MoEDAL versus ATLAS/CMS for various long-lived particles in supersymmetric models, and we seek a scenario where MoEDAL can provide discovery reach complementary to ATLAS and CMS.
Flavor mixed sleptons and its consequences at one-loop level
Authors: Espinosa-Castañeda R , Flores-Baez F V , Gómez-Bock M , Mondragón M 
Published: September 2020

Abstract
In this work we explore a lepton flavor violation effect induced at one-loop level in an extended version of the minimal supersymmetric standard model with a flavor structure which mix second and third families in the trilinear terms of the soft supersymmetric Lagrangian. In particular, we find a finite expression for

B
R
(
τ
→
μ
γ
)

and

B
R
(
h
→
μ
τ
)

decay, produced by flavor mixed sleptons running in the loop. We would also calculate the

μ
→
μ
γ

1-loop extra contribution that can lead to a solution of the muon g − 2 problem in some regions of parameter space.
The Inert Doublet Model at current and future colliders
Authors: Kalinowski J , Kotlarski W , Robens T , Sokolowska D , Żarnecki A F 
Published: September 2020

Abstract
We discuss the status of the Inert Doublet Model, a two-Higgs doublet model that obeys a discrete Z
2 symmetry and provides a dark matter candidate. We discuss all current theoretical and experimental constraints on the model as well as discovery prospects at current and future colliders.
Fifth forces and discrete symmetry breaking
Authors: Millington P 
Published: September 2020

Abstract
Modifications of general relativity often involve coupling additional scalar fields to the Ricci scalar, leading to scalar-tensor theories of Brans-Dicke type. If the additional scalar fields are light, they can give rise to long-range fifth forces, which are subject to stringent constraints from local tests of gravity. In this talk, we show that Yukawa-like fifth forces only arise for the Standard Model (SM) due to a mass mixing of the additional scalar with the Higgs field, and we emphasise the pivotal role played by discrete and continuous symmetry breaking. Quite remarkably, if one assumes that sufficiently light, non-minimally coupled scalar fields exist in nature, the non-observation of fifth forces has the potential to tell us about the structure of the SM Higgs sector and the origin of its symmetry breaking. Moreover, with these observations, we argue that certain classes of scalar-tensor theories are, up to and including their dimension-four operators, equivalent to Higgs-portal theories. In this way, ultra-light dark matter models may also exhibit fifth-force phenomenology, and we consider the impact on the dynamics of disk galaxies as an example.
An Inert Scalar In The S3 Symmetric Model.
Authors: Espinoza C , Garcés E A , Mondragón M , Reyes-González H 
Published: September 2020

Abstract
We consider the S3 symmetric extension of the Standard Model in which all the irreducible representations of the permutation group are occupied by SU(2) scalar doublets, one of which is taken as inert. We study the parameter space of the model probing points against physical constraints ranging from unitarity tests to experimental Higgs searches limits. We find that the latter constraints severely restrict the parameter space of the model, and that the relic density of the dark matter candidates lies below the Planck bound for a large portion of the probed regions.
Spinor–vector duality and sterile neutrinos in string derived models
Authors: Faraggi Alon E. 
Published: September 2020

Abstract
The MiniBooNE collaboration found evidence for the existence of sterile neutrinos, at a mass scale comparable to the active left–handed neutrinos. While sterile neutrinos arise naturally in large volume string scenarios, they are more difficult to accommodate in heterotic–string derived models that reproduce the GUT embedding of the Standard Model particles. Sterile neutrinos in heterotic–string models imply the existence of an additional Abelian gauge symmetry at low scales, possibly within reach of contemporary colliders. I discuss the construction of string derived Z′
models that utilise the spinor–vector duality to guarantee that the extra U(1)
Z′
symmetry can remain unbroken down to low scales.
Tests of the electroweak sector with precision measurements and diboson final states at the ATLAS Experiment.
Authors: Fabbri L 
Published: September 2020

Abstract
The electroweak sector of the Standard Model can be tested either via precision measurements of fundamental observables or via direct tests of its underlying gauge structure. The ATLAS collaboration has recently released a measurement of the effective leptonic weak mixing angle using data collected at a centre-of-mass energy of 8 TeV. The result has a precision similar to that of the most precise individual measurements. The high integrated luminosity delivered by the LHC during Run-2 has allowed ATLAS to measure integrated and differential cross-sections for several kinematic observable of W±Z production in pp collisions and to observe vector boson scattering processes with WZ and same-sign WW final states. The results from these milestone analyses as well as their interpretation in the context of the Standard Model are presented in this proceeding.
Nonexistence of locally but not globally supersymmetric orbifolds
Authors: Groot Nibbelink S 
Published: September 2020

AbstractMotivated by the smallness of the cosmological constant we investigate whether it is possible to have vanishing one-loop heterotic string partition functions for six-dimensional non-supersymmetric toroidal orbifolds. A straightforward way to realize this presents itself, when each orbifold sector separately preserves some Killing spinors, but none of them survives in all sectors combined. By applying some representation theory to the abstract finite point groups underlying toroidal orbifolds it turns out, that this is never possible. This leads to a nonexistence proof of locally but not globally supersymmetric orbifolds.
Overview on solar, geo, and reactor neutrino experiments
Authors: Ludhova L 
Published: September 2020

Abstract
Neutrino physics has made a substantial progress in recent years: ranging from the discovery of new phenomena, as neutrino oscillations, up to the development of milestone experimental techniques, going, at the end, hand-in-hand. Today, we are able to do precision neutrino physics, as well as we have succeeded in using neutrinos as new tools to gain information about astrophysical objects. In spite of this enormous progress, many fundamental questions remain unanswered. This contribution concentrates on low-energy MeV neutrinos emitted from our Sun, along the radioactive decays inside the Earth (geoneutrinos), and reactor neutrinos. For each of these three fields, the present-day motivation, open questions, as well as the latest experimental results and future perspectives are discussed.
Quantum stability in open string theory with broken supersymmetry
Authors: Partouche H 
Published: September 2020

Abstract
We consider the 1-loop effective potential in type I string theory compactified on a torus, with supersymmetry broken by the Scherk-Schwarz mechanism. At fixed supersymmetry breaking scale M, and up to exponentially suppressed terms, we show that the potential admits local minima of arbitrary sign, in dimension d ≤ 5. While the open string Wilson lines are massive, the closed string moduli are flat directions. In a T-dual picture, the relevant backgrounds involve isolated ½-branes, whose positions are frozen on orientifold planes, thus decreasing the rank of the gauge group, and introducing massless fermions in fundamental representations.
Gravitational waves from cosmic domain walls: a mini-review
Authors: Saikawa K 
Published: September 2020

Abstract
Domain walls are sheet-like topological defects produced when a discrete symmetry is spontaneously broken in the early universe. Although the existence of stable domain walls is disfavored by cosmological considerations, it is possible to consider unstable domain walls which disappear early enough not to lead cosmological disasters. In this contribution, we discuss the possibility that a significant amount of gravitational waves is produced by annihilation of such unstable domain walls in the early universe. After reviewing cosmological evolution of domain walls, we give an estimate of the expected gravitational wave signal based on the results of numerical simulations. In addition, we briefly review some well-motivated particle physics models that predict the formation of unstable domain walls. The detectability of predicted signals is also discussed in prospect of planned gravitational wave observatories.
Natural supersymmetric Twin Higgs
Authors: Badziak M , Harigaya K 
Published: September 2020

Abstract
A new class of supersymmetric Twin Higgs (TH) models where new gauge symmetry is responsible for the TH mechanism is reviewed. In this class of models the Higgs mass is naturally in agreement with the LHC measurement while the electroweak symmetry breaking is realised without excessive tuning despite of strong lower bounds on masses of supersymmetric particles set by the LHC. Assuming particular non-abelian structure of the new gauge symmetry the model remains perturbative up to the energy scale of gravity, in contrast to all previously proposed UV completions of the TH model.
Impact of new physics on B + L violation at colliders
Authors: Cerdeño D G , Reimitz P , Sakurai K , amarit C T 
Published: September 2020

Abstract
In the Standard Model, chiral electroweak anomalies predict nonperturbative interactions that violate baryon (B) plus lepton number (L). The potential observability of these processes at colliders has been amply discussed in the literature, mostly focusing on the impact of the accompanying boson emission, which contributes to the cross sections through an exponential function of the center-of-mass energy. We focus instead on the impact of exotic fermions charged under SU(2)L, which not only can be emitted in these processes, but also affect the non-exponential contributions to the cross-sections. Estimating the latter using instanton techniques, we find sizable effects that suggest that if B + L-violating processes are ever seen at colliders, they may involve physics beyond the Standard Model.
Jamming effect evaluation method based on radar behavior recognition
Authors: Chu Zhenyong , Xiao Nan , Liang Jun 
Published: September 2020

Abstract
Rapid and accurate evaluation of radar jamming effect is an important link to enhance the effectiveness of cognitive electronic warfare. Based on the correlation between nodes of networked combat systems, this paper proposes a method to judge the jamming effect of radar through behavior recognition. The attacker utilizes its own sensors to perceive the behaviors of victim radar and its cooperative radar, uses support vector machine (SVM) algorithm to identify and classify their behaviors, marks the classification result as jamming effect label, determines the influence of jamming on the working state of radar, and evaluates the jamming effect of the victim radar. The simulation results show that the proposed method has higher accuracy than the traditional method that only considers victim radar’s behaviors, and the kernel function selection and the dimension of behavior parameters are closely related to the accuracy of the evaluation results.
Application of SVM model to environmental resource analysis in tourism development
Authors: Han Jing 
Published: September 2020

Abstract
With the improvement of economic and living standards, the demand for tourism is increasing. However, the development of tourism brings many problems to the environment, such as aggravating the environmental pollution and reducing the available environmental resources. At the same time, good environmental resources can stimulate local tourism development and economic growth. This paper uses support vector machine (SVM) model to establish the nonlinear relation model between tourism market turnover and various influencing factors, analyses the development of present Chengdu’s tourism market, and predicts the market turnover in three years to provide quantitative reference for the analysis of environmental resources in tourism development.
Fruit image recognition and classification method based on improved single shot multi-box detector
Authors: Cai Jinfan , Tao Jiaxin , Ma Yahong , Fan Xiaojiao , Cheng Lin 
Published: September 2020

Abstract
In recent years, pattern recognition has been gradually applied to the field of agriculture, especially fruit classification and rating based on image. However, the target fruit is affected by the interference factors such as light change, uneven brightness, similar background, branches and leaves, shadow coverage, etc. In order to solve the problems of low recognition rate and low generalization of fruits in the natural environment, we proposed an improved SSD (Single Shot Multi-box Detector) to classify apple, persimmon, nectarine and pear. The original network is optimized and the more advanced soft NMS (Non-Maximum Suppression) is used to obtain the anchor boxes, so as to provide a better initial value for the prediction of the bounding box. At the same time, under the premise of keeping good performance independent of the network architecture, batch normalization is used to initialize the de-random training model, which brings stable and predictable gradient of the detector. Through the identification test of four kinds of fruits collected in the natural background, the experiment shows that the improved SSD fruit detection model is effective. The fruit recognition speed is the fastest and the detection accuracy is the highest compared with other methods. The average detection accuracy in various environments has reached 92.4%. It can be concluded that the proposed method will realize the accurate detection of many kinds of fruits, and provide a new scheme for the fruit recognition and detection problems in agricultural automatic picking.
Wrestling performance prediction based on improved RBF neural network
Authors: Zhao Linlin , Liu Runzhi , Wu Jianzhong , Guo Lulu 
Published: September 2020

Abstract
As the earliest competitive sport, wrestling has become a world-class event through continuous development and improvement. Practitioners of competitive sports combine modern science such as life science, nutrition, statistics and so on to study the techniques and methods of improving wrestling performance. In this paper, a quantitative prediction model of wrestling performance is established by improving RBF neural network based on dropout theory. By analyzing the quantitative factors such as hemoglobin, blood urea and the technical factors such as reaction strength, speed and endurance of athletes, data were collected and network training was conducted. The predicted results have a high fitting degree with the real results, which can be used to predict the achievements of wrestlers and provide important reference for relevant practitioners in making training plans, selecting competitors and improving the competitive level.