HEP Phenomenology·hep-ph

Fri·Apr 15, 2022Friday·April 15, 2022

24 papers—18 primary·6 cross-listed·reconstructed*

01*
Classical and relavistic simple wave problems solved with Smoothed Particle Hydrodynamics
J V O Caetano🇧🇷 · L S Nowacki🇧🇷 · V S Franção🇧🇷 · R Hirayama🇩🇪 · K P Pala🇧🇷 · J O Sola🇧🇷 · F Grassi🇧🇷
To simulate the expansion of the matter created in relativistic nuclear collisions, codes in 3+1 dimensions are used and we are developing a new one. To benchmark such codes, the Sod's shock tube is often used. A closely related problem is the one-dimensional expansion of a gas into vacuum. In this paper, we study this problem classically and relativistically with the Smoothed Particle Method and test various techniques to improve the precision and speed of the solution.
hep-phnucl-thJ.Phys.Conf.Ser.(2022)·0 citations
02*
Feasibility of the experimental study of $D_{s}^{*}$ $\to$ $ϕ π$ decay
Yueling Yang🇨🇳 · Kang Li🇨🇳 · Zhenglin Li🇨🇳 · Jinshu Huang🇨🇳 · Junfeng Sun🇨🇳
The current knowledge on the $D_{s}^{*}$ meson are very limited. Besides the dominant electromagnetic decays, the $D_{s}^{*}$ weak decays are legal and offer the valuable opportunities to explore the wanted $D_{s}^{*}$ meson. In this paper, the $D_{s}^{*}$ $\to$ $ϕ π$ decay was studied with the factorization approach. It is found that the branching ratio $B (D_{s}^{*} \to ϕ π)$ $\sim$ $O (1 0^{- 7})$ , which corresponds to several thousands of events at the $e^{+} e^{-}$ collider experiments including STCF, SuperKEKB, CEPC and FCC-ee, and several millions of events at the hadron collider experiments, such as LHCb@HL-LHC. It is feasible to experimentally study the $D_{s}^{*}$ $\to$ $ϕ π$ weak decay in the future, even considering the identification efficiency.
hep-phhep-exEPJC(2022)·1 citation
03*
Pion parton distribution functions with the nonrelativistic constituent quark model
Qian Wu🇨🇳 · Chengdong Han🇨🇳 · Di Qing🇨🇦 · Wei Kou🇨🇳 · JuJun Xie🇨🇳 · Fan Wang🇨🇳 · Xurong Chen🇨🇳
We calculate the valence quark distribution functions of the $π$ meson using the non-relativistic chiral constituent quark model. The $π$ wave function is obtained by solving the two-body Schrödinger equation within the framework of constituent quark model. We transform the $π$ wave function from the rest frame to the light cone or infinite momentum frame based on the Lorentz boost. The valence quark distributions at the initial evolution scale are obtained. The QCD evolution are given with the DGLAP equations with parton-parton recombination corrections. With tuning the valence up (down) quark mass to 70 MeV, the calculated valence up quark distributions at $Q^{2} = 20$ GeV $^{2}$ are in good agreement with the E615 experimental data. The structure functions $F_{2}^{π} (x, Q^{2})$ of pion are also calculated which consist with the H1 experimental data. The proposed mechanisms here could be also used to study other hadrons.
hep-phNPB(2023)·5 citations
04*
Unbinned Angular Analysis of $B \to D^{*} (D π) ℓ ν_{ℓ}$ and $C_{V_{R}}$
Zhuo-Ran Huang🇰🇷 · Emi Kou🇫🇷 · Cai-Dian Lü🇨🇳 · Ru-Ying Tang🇨🇳
A sensitivity study of the unbinned angular analysis of the $B \to D^{*} (D π) ℓ ν_{ℓ}$ decay is presented. In the analysis, it is shown that the Wilson coefficient of the right-handed vector current, $C_{V_{R}}$ , can be measured to precision of 2-4 $%$ using either the full set of normalised angular observables or the forward-backward asymmetry $A_{F B}$ of the charged lepton in 10 $w$ bins. Such angular measurements are independent of the $V_{c b}$ puzzle.
hep-ph1 citation
05*
Sivers function of sea quarks in the light-cone model
Xiaoyan Luan🇨🇳 · Zhun Lu🇨🇳
We calculate the Sivers function of $u ˉ$ and $d ˉ$ quarks using the overlap representation within the light-cone formalism. The light-cone wave functions of the proton is obtained in terms of the $∣ q ˉ q B ⟩$ Fock states motivated by the meson-baryon fluctuation model. We consider the final-state interaction at the level of one gluon exchange. In a simplified scenario, the Sivers function of $u ˉ$ and $d ˉ$ can be expressed as the convolution of the Sivers function of the pion inside the proton and the unpolarized distribution of $q ˉ$ inside the pion. The model parameters are fixed by fitting the unpolarized sea quark distributions to the known parameterizations. We present the numerical results for $f_{1}^{⊥ u ˉ / p} (x, k_{T}^{2})$ and $f_{1}^{⊥ d ˉ / p} (x, k_{T}^{2})$ . The first transverse moment of the sea quark Sivers functions in our model are find to be negative and the magnitude is about 0.004 at most.
hep-phPLB(2022)·10 citations
06*
New calculations of neutron and kaon decays
Chien-Yeah Seng🇩🇪
We describe two recent developments of the radiative correction theory in semileptonic beta decays. For neutron, a novel dispersive analysis of the $γ W$ -box diagram making use of neutrino scattering data leads to an improved precision and a shifted central value of $V_{u d}$ ; for kaon, an appropriate combination of meson form factors, lattice QCD inputs and chiral perturbation theory gives a much-improved determination of the radiative corrections in semileptonic kaon decays. These new calculations help to unveil/sharpen a series of anomalies in the measurements of $V_{u d}$ and $V_{u s}$ that may point towards the existence of new physics.
hep-phhep-exhep-latnucl-ex+10 citations
07*
Restricting $q^{2} l^{2}$ operators from $π^{0} \to μ e$
Mathew Thomas Arun🇮🇳 · Priyanka Lamba🇵🇱 · Sudhir K. Vempati🇮🇳
In this paper we consider semileptonic lepton flavor violating operators of the type $q^{2} l^{2}$ in low energy effective theory (LEFT). At the chiral scale, we match these operators to chiral perturbation theory ( $χ$ PT) and place constraints from the process $π^{0} \to μ^{+} e^{-}$ . These bounds are shown to depend on the chiral nature of the operators. The scalar operators are significantly more constrained compared to the vector operators. We then compare the limits from $μ \to e$ conversion in Nuclei and show that the limits on scalar operators are within an order of magnitude of the corresponding limits from $μ \to e$ conversion in Ti. On the other hand, the limits on vector operators are however much weaker. Towards the end, we evolve the LEFT operators to W-boson mass scale using RGE, and match them to the Standard Model effective field theory (SMEFT) operators. We, then, derive the constraints on the parameter space of Leptoquark models that could generate these SMEFT operators at tree level.
hep-ph3 citations
08*
Colour Evolution and Infrared Physics
Simon Plätzer🇦🇹
We give a complete account of how soft gluon, massless quark, evolution equations in colour space originate, from a factorization into a hard cross section density operator and a soft function encoding measurements and the projection on definite colours. We detail this formalism up to the two loop level and we demonstrate how the evolution kernels relate to infrared subtractions, and how the resolution of infrared singular regions conspires with the structure of observables the algorithm should be able to predict. The latter allows us to address evolution in different kinematic variables, including energy ordering and angular cutoffs in non-global observables. The soft factor and its evolution resembles a hadronization model including effects such as colour reconnection, and could give insight into the structure of power corrections in observables which require soft gluon evolution.
hep-phJHEP(2023)·23 citations
09*
Two Higgs doublets, Effective Interactions and a Strong First-Order Electroweak Phase Transition
Anisha🇮🇳 · Lisa Biermann🇩🇪 · Christoph Englert🇬🇧 · Margarete Mühlleitner🇩🇪
It is well-known that type II two Higgs doublet models (2HDMs) can struggle to facilitate a strong first-order electroweak phase transition in the early universe whilst remaining theoretically appealing scenarios for many reasons. We analyse this apparent shortfall from the perspective of additional new physics. Starting from a consistent dimension-6 effective field theory Higgs potential extension, we identify the Higgs potential extensions that provide the necessary additional contributions required to achieve a strong first-order electroweak phase transition and trace their phenomenological implications for the Large Hadron Collider. In passing, we critically assess the reliability of the dimension-6 approximation depending on the expected 2HDM phenomenology. In particular, we focus on the role of Higgs pair production (resonant and non-resonant) and interference effects expected in top final states, which are the prime candidates of 2HDM exotics discoveries.
hep-phJHEP(2022)·35 citations
10*
Cutting rules on a cylinder and simplified diagrammatic approach to $C P$ violation in quantum kinetic theory
Peter Maták🇸🇰 · Tomáš Blažek🇸🇰
We briefly explain a novel diagrammatic method for including thermal corrections in $C P$ asymmetric reaction rates entering the quantum Boltzmann equation. In thermal equilibrium, the asymmetries have to cancel precisely due to the $S$ -matrix unitarity and $C P T$ invariance. Such cancelations are easy to track in zero-temperature leading-order calculations. However, accounting for medium effects requires modification of the on-shell part of propagators and, consequently, the $C P$ violating rates. In the literature, the correct form of the statistical factors in the asymmetry source term has been obtained employing the real-time-formalism of non-equilibrium field theory in a certain approximation. We demonstrate that the same results can be obtained by summing an infinite sequence of zero-temperature asymmetries. Those are derived from cuttings of forward diagrams drawn on a cylindrical surface, while thermal corrections come from windings of their propagators. The procedure is entirely diagrammatic, and the $C P T$ and unitarity cancelations are formulated for thermally corrected reaction rate asymmetries. The simplification achieved is the primary focus of our work. The aspect of infrared finiteness in higher-order corrections will also be discussed.
hep-phPoS(2022)·0 citations
11*
QCD Phase Boundary and the Hadrochemical Horizon
Berndt Müller🇺🇸
I review the physics of the phase boundary between hadronic matter and quark matter from several different points of view. These include thermodynamics, statistical physics, and chemical kinetics. In particular, the review focuses on the role of the chemical freeze-out line and its relation to the concept of valence quark percolation. The review ends with some recollections of Jean Cleymans.
hep-phnucl-thMDPI Physics(2022)·2 citations
12*
$W$ boson mass and muon $g - 2$ in a lepton portal dark matter model
Junichiro Kawamura🇰🇷 · Shohei Okawa🇪🇸 · Yuji Omura🇯🇵
We study a lepton portal dark matter model, motivated by the deviation of the $W$ boson mass reported by the CDF collaboration. We introduce vector-like leptons and a scalar dark matter (DM) which exclusively couples to the extra leptons and muon. The one-loop corrections induced by the new particles can shift the $W$ boson mass. Besides, the discrepancy in the muon anomalous magnetic moment and the DM density can simultaneously be explained by this setup, if the vector-like lepton is lighter than 200 GeV and nearly degenerate with the DM particle. We also see that the constraints on such a light extra lepton from the collider experiments can be evaded due to the existence of the DM particle.
hep-phhep-exPRD(2022)·85 citations
13*
Impact of dark matter self-scattering on its relic abundance
Andrzej Hryczuk🇵🇱 · Maxim Laletin🇵🇱
Elastic self-scatterings do not change the number of dark matter particles and as such have been neglected in the calculation of its relic abundance. In this work we highlight the scenarios where the presence of self-scatterings has a significant impact on the effectiveness of annihilation processes through the modification of dark matter momentum distribution. We study a few example freeze-out scenarios involving resonant and sub-threshold annihilations, as well as a model with an additional source of dark matter particles from the decays of a heavier mediator state. Interestingly, when the calculation is performed at the level of dark matter momentum distribution function, we find that the injection of additional energetic dark matter particles onto the thermal population can lead to a $decrease$ of its final relic abundance.
hep-phastro-ph.COPRD(2022)·22 citations
14*
Form Factors in Higgs Couplings from Physics Beyond the Standard Model
Pedro Bittar🇧🇷 · Gustavo Burdman🇧🇷
We consider the momentum-dependent effects in Higgs couplings generated by physics beyond the standard model. We take a model-dependent approach, in which we can fully compute the non-local effects from physics not directly reachable by the LHC energy. We consider several scenarios, including composite Higgs models, additional scalars, and the continuum contributions of a quasi-conformal sector, as examples. For each specific model, we are able to obtain the form factor, with which it is then possible to fully simulate the effects in kinematics distributions. The momentum-dependent effects appear as a consequence of off-shellness in the process. We show how the sensitivity of different channels to the various models depends on how the flow of off-shellness appears in the Higgs couplings.
hep-phhep-exJHEP(2022)·15 citations
15*
Vacuum stability and scalar masses in the superweak extension of the standard model
Zoltán Péli🇭🇺 · Zoltán Trócsányi🇭🇺
We study the allowed parameter space of the scalar sector in the superweak extension of the standard model (SM). The allowed region is defined by the conditions of (i) stability of the vacuum and (ii) perturbativity up to the Planck scale, (iii) the pole mass of the Higgs boson falls into its experimentally measured range. We employ renormalization group equations and quantum corrections at two-loop accuracy. We study the dependence on the Yukawa couplings of the sterile neutrinos at selected values. We also check the exclusion limit set by the precise measurement of the mass of the W boson. Our method for constraining the parameter space using two-loop predictions can also be applied to simpler models such as the singlet scalar extension of the SM in a straightforward way.
hep-phhep-thPRD(2022)·34 citations
16*
Type III seesaw with R-parity violation in light of $m_{W}$ (CDF)
Anish Ghoshal🇵🇱 · Nobuchika Okada🇺🇸 · Satomi Okada🇺🇸 · Digesh Raut🇺🇸 · Qaisar Shafi🇺🇸 · Anil Thapa🇺🇸
Motivated by the recently reported measurement of the $W$ boson mass $M_{W} = 80.4335 \pm 0.0094$ GeV by the CDF collaboration, we propose a type III seesaw extension of the minimal supersymmetric standard model (MSSM) which also includes an R-parity violating term. Without taking potential SUSY radiative corrections into account, we show that the CDF measurement of $M_{W}$ and the LEP measurement of the $ρ$ parameter can be simultaneously accommodated at the $2 σ$ level. A long-lived gravitino in a few GeV mass range is a unique viable dark matter candidate in this framework.
hep-phNPB(2023)·65 citations
17*
On the $W$ -mass and New Higgs Bosons
Pavel Fileviez Perez🇺🇸 · Hiren H. Patel🇺🇸 · Alexis D. Plascencia🇮🇹
We discuss the prediction of the $W$ boson mass in a simple extension of the Standard Model ( $Σ SM$ ) with a real scalar triplet. A shift in the $W$ mass as reported by the CDF II collaboration can naturally be accommodated by the model without modifying the Standard Model value for the $Z$ mass. We discuss the main implications and the properties of the new Higgs bosons. Namely, the partial decay widths of the new charged Higgs are predicted. Furthermore, the neutral Higgs has suppressed couplings to fermions and decays predominantly into a pair of $W$ gauge bosons.
hep-phhep-exPLB(2022)·88 citations
18*
Explaining the 96 GeV Di-photon Anomaly in a Generic 2HDM Type-III
Rachid Benbrik (1)🇲🇦 · Mohammed Boukidi (1)🇲🇦 · Stefano Moretti (2) (3)🇬🇧 · Souad Semlali (2) ((1) Polydisciplinary Faculty, Laboratory of Fundamental and Applied Physics, Cadi Ayyad University, Sidi Bouzid, Safi, Morocco, (2) School of Physics and Astronomy, University of Southampton, United Kingdom, (3) Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)🇬🇧
Motivated by results recently reported by the CMS Collaboration about an excess in the di-photon spectrum at about 96 GeV, especially when combined with another long-standing anomaly at the same value in the $b b ˉ$ invariant mass spectrum in four-jet events collected at LEP, we show that a possible explanation to both phenomena can be found at 1 $σ$ level in a generic 2-Higgs Doublet Model (2HDM) of Type-III in presence of a specific Yukawa texture, wherein Lepton Flavour Violating (LFV) (neutral) currents are induced at tree level. Bounds from Higgs data play a major role in limiting the parameter space of this scenario, yet we find solutions with $m_{H} = 125$ GeV and $m_{h} = 96$ GeV consistent with current theoretical and experimental bounds.
hep-phPLB(2022)·50 citations
19*
Anatomy of a top-down approach to discrete and modular flavor symmetry
Andreas Trautner🇩🇪
The framework of compactified heterotic string theory offers consistent ultraviolet (UV) completions of the Standard Model (SM) of particle physics. In this approach, the existence of flavor symmetries beyond the SM is imperative and the flavor symmetries can be derived from the top-down. Such a derivation uncovers a unified origin of traditional discrete flavor symmetries, discrete modular flavor symmetries, discrete R symmetries of supersymmetry, as well as CP symmetry - altogether called the eclectic flavor symmetry. I will show a specific example of such a top-down derived eclectic flavor symmetry, discuss the different sources of breaking of the eclectic flavor symmetry, as well as the possible lessons for bottom-up flavor model building.
↳ hep-thhep-phPoS(2022)·0 citations
20*
Precision cosmology from large-scale structure of the Universe
A. Chudaykin🇨🇦
Large scale structure of the Universe becomes a leading source of precision cosmological information. We present two particular tools that can be used in cosmological analyses of the redshift space galaxy clustering data: a new open-source code CLASS-PT and the theoretical error approach. CLASS-PT computes one-loop power auto- and cross-power spectra for matter fields and biased tracers in real and redshift spaces. We show that the code meets the precision standards set by the upcoming high-precision large-scale structure surveys. The theoretical error likelihood approach allows one to analyze galaxy clustering data without having to measure the scale cut $k_{max}$ . This approach takes into account that theoretical uncertainties affect parameter estimation gradually, which helps optimize data analysis and ensures that all available cosmological information is extracted.
↳ astro-ph.COhep-ph1 citation
21*
Exploring new states of matter with a photonic emulator
Felix Karbstein🇩🇪 · Simon Stützer🇩🇪 · Holger Gies🇩🇪 · Alexander Szameit🇩🇪
We implement the equation of motion of the large-N Gross-Neveu model from strong interaction physics in photonic waveguide arrays and study one of its paradigmatic multi-fermion bound state solutions in an optical experiment. The present study constitutes an important first step towards waveguide-based simulations of phenomena relevant for high-energy physics.
↳ physics.opticshep-phquant-phPRResearch(2023)·2 citations
22*
Independent determination of the Earth's orbital parameters with solar neutrinos in Borexino
S. Appel🇩🇪 · Z. Bagdasarian🇩🇪 · D. Basilico🇮🇹 · G. Bellini🇮🇹 · J. Benziger🇺🇸 · R. Biondi🇮🇹 · B. Caccianiga🇮🇹 · F. Calaprice🇺🇸 · A. Caminata🇮🇹 · A. Chepurnov🇷🇺 · D. D'Angelo🇮🇹 · A. Derbin🇷🇺 and 67 other authors
Since the beginning of 2012, the Borexino collaboration has been reporting precision measurements of the solar neutrino fluxes, emitted in the proton-proton chain and in the Carbon-Nitrogen-Oxygen cycle. The experimental sensitivity achieved in Phase-II and Phase-III of the Borexino data taking made it possible to detect the annual modulation of the solar neutrino interaction rate due to the eccentricity of Earth's orbit, with a statistical significance greater than 5 $σ$ . This is the first precise measurement of the Earth's orbital parameters based solely on solar neutrinos and an additional signature of the solar origin of the Borexino signal. The complete periodogram of the time series of the Borexino solar neutrino detection rate is also reported, exploring frequencies between one cycle/year and one cycle/day. No other significant modulation frequencies are found. The present results were uniquely made possible by Borexino's decade-long high-precision solar neutrino detection.
↳ hep-exastro-ph.EPastro-ph.IMastro-ph.SR+1Astropart.Phys.(2023)·16 citations
23*
Non-perturbative Double Copy in Flatland
Clifford Cheung🇺🇸 · James Mangan🇺🇸 · Julio Parra-Martinez🇺🇸 · Nabha Shah🇺🇸
We derive a non-perturbative, Lagrangian-level formulation of the double copy in two spacetime dimensions. Our results elucidate the field theoretic underpinnings of the double copy in a broad class of scalar theories which can include masses and higher-dimension operators. An immediate corollary is the amplitudes-level double copy at all orders in perturbation theory. Applied to certain integrable models, the double copy defines an isomorphism between Lax connections, Wilson lines, and infinite towers of conserved currents. We also implement the double copy at the level of non-perturbative classical solutions, both analytically and numerically, and present a generalization of the double copy map that includes a fixed tower of higher-dimension corrections given by the Moyal algebra.
↳ hep-thhep-phPRL(2022)·43 citations
24*
Enhanced Gravitational Waves from Inflaton Oscillons
Kaloian D. Lozanov🇺🇸 · Volodymyr Takhistov🇯🇵
In broad classes of inflationary models the period of accelerated expansion is followed by fragmentation of the inflaton scalar field into localized, long-lived and massive oscillon excitations. We demonstrate that matter-dominance of oscillons, followed by their rapid decay, significantly enhances the primordial gravitational wave (GW) spectrum. These oscillon-induced GWs, sourced by second-order perturbations, are distinct and could be orders of magnitude lower in frequency than the previously considered GWs associated with oscillon formation. We show that detectable oscillon-induced GW signatures establish direct tests independent from cosmic microwave background radiation (CMB) for regions of parameter space of monodromy, logarithmic and pure natural (plateau) potential classes of inflationary models, among others. We demonstrate that oscillon-induced GWs in a model based on pure natural inflation could be directly observable with the Einstein Telescope, Cosmic Explorer and DECIGO. These signatures offer a new route for probing the underlying inflationary physics.
↳ astro-ph.COastro-ph.HEhep-phhep-thPRL(2023)·53 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.