Tue·Jan 11, 2022Tuesday·January 11, 2022

1. 01*

   SO(10): a Case for Hadron Colliders

   Anca Preda🇩🇪 · Goran Senjanovic🇩🇪 · Michael Zantedeschi🇩🇪

   We study the mass scales in the $SO(10)$ grand unified theory based on the following minimal Higgs representation content: adjoint $45_{\mathrm{H}}$, spinor $16_{\mathrm{H}}$ and complex vector $10_{\mathrm{H}}$, with higher dimensional operators on top of renormalizable interactions. We show that the consistency of the theory requires scalar $W$ and $Z$, scalar quark doublet and scalar gluon to lie below $10\mathrm{TeV}$ energy and potentially accessible even at the LHC. These signatures are intimately connected with the prediction of proton lifetime below $10^{35}\mathrm{yr}$, to be probed in the new generation of proton decay experiments.

   hep-phhep-exPLB(2023)·27 citations
2. 02*

   Hadronic molecule model for the doubly charmed state $T_{cc}^{+}$

   S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · H. Sundu🇹🇷

   The mass, current coupling, and width of the doubly charmed four-quark meson $T_{cc}^{+}$ are explored by treating it as a hadronic molecule $M_{cc}^{+}\equiv D^0{D}^{\ast +}$. The mass and current coupling of this molecule are calculated using the QCD two-point sum rule method by including into analysis contributions of various vacuum condensates up to dimension $10$. The prediction for the mass $m=(4060\pm 130)\mathrm{MeV}$ exceeds the two-meson $D^0{D}^{\ast +}$ threshold $3875.1\mathrm{MeV}$, which makes decay of the molecule $M_{cc}^{+}$ to a pair of conventional mesons $D^0{D}^{\ast +}$ kinematically allowed process. The strong coupling $G$ of particles at the vertex $M_{cc}^{+}{D}^0{D}^{\ast +}$ is found by applying the QCD three-point sum rule approach, and used to evaluate the width of the decay $M_{cc}^{+}\to D^0{D}^{\ast +}$. Obtained result for the width $\Gamma =(3.8\pm 1.7)\mathrm{MeV}$ demonstrates that $M_{cc}^{+}$ is wider than the resonance $T_{cc}^{+}$.

   hep-phhep-exhep-latJHEP(2022)·54 citations
3. 03*

   Extracting the jet transport coefficient from hadron suppressions by confronting current NLO parton fragmentation functions

   Qing-Fei Han🇨🇳 · Man Xie🇨🇳 · Han-Zhong Zhang🇨🇳

   Nuclear modification factors of single hadrons and dihadrons at large transverse momentum ($p_{\mathrm{T}}$) in high-energy heavy-ion collisions are studied in a next-to-leading-order (NLO) perturbative QCD parton model. Parton fragmentation functions (FFs) in $A+A$ collisions are modified due to jet energy loss which is proportional to the jet transport coefficient $\hat{q}$ characterizing the interaction between the parton jet and the produced medium. By confronting 6 current sets of NLO parton FFs for large $p_{\mathrm{T}}$ hadron productions, we extract $\hat{q}$ quantitatively via a global fit to data for both single hadron and dihadron suppressions, and obtain $\hat{q}/T^3=4.74-6.72$ at $T=370$ MeV in central $Au+Au$ collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV, and $\hat{q}/T^3=3.07-3.98$ at $T=480$ MeV in central $Pb+Pb$ collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The numerical results show that the uncertainties for $\hat{q}$ extraction are brought by the different contributions of gluon-to-hadron in the 6 sets of FFs due to gluon energy loss being $9/4$ times of quark energy loss.

   hep-phnucl-exnucl-thEur.Phys.J.Plus(2022)·9 citations
4. 04*

   Chameleon-neutrino conformal coupling and MSW-mediated solar neutrino deficit

   H. Yazdani Ahmadabadi🇮🇷 · H. Mohseni Sadjadi🇮🇷

   A modified version of the MSW effect is studied within the framework of screening models through conformal couplings of a scalar field within matter. Such a coupling leads to a new, unknown interaction between the scalar field and the neutrino. We mainly look for the discrepancy in the total solar electron-neutrinos flux through this interaction. Since the scalar field behavior depends on the local density of matter, we observe an indirect effect of matter on flavor changes, and subsequently, on neutrino flux through neutrino decay. The paper ends by describing various probabilities and comparing the results with observational data.

   hep-phgr-qchep-thPLB(2024)·9 citations
5. 05*

   Fully-heavy hexaquark states via the QCD sum rules

   Zhi-Gang Wang🇨🇳

   We construct the diquark-diquark-diquark type vector six-quark currents to investigate the vector and scalar hexaquark states in the framework of the QCD sum rules in a consistent way, and make predictions for the hexaquark masses. We can search for the fully-heavy hexaquark states in the di-${\Omega }_{ccc}$ and di-${\Omega }_{bbb}$ invariant mass spectra in the future. Combined with our previous works on the fully-heavy tetraquark states and pentaquark states, the present predictions can shed light on the nature of the fully-heavy multiquark states.

   hep-phInt.J.Mod.Phys.A(2022)·20 citations
6. 06*

   CP Phases in 2HDM and Effective Potential: A Geometrical View

   Qing-Hong Cao🇨🇳 · Kun Cheng🇨🇳 · Changlong Xu🇨🇳

   Using a geometric description of 2HDM, we classify CP invariants into three independent sectors such as scalar potential, Yukawa interaction and CKM matrix. Thermal effective potential of 2HDM is calculated in a basis invariant way. It is shown that the CP violation in Yukawa interactions can contribute to effective potential at one loop level but the CP phase in the CKM matrix cannot leak to effective potential at all orders. In the 2HDM with a softly broken Z_2 symmetry, the leading thermal correction tends to restore the CP symmetry at high temperature.

   hep-phhep-exhep-thPRD(2023)·12 citations
7. 07*

   Effects of squared four-fermion operators of the Standard Model Effective Field Theory on meson mixing

   Luiz Vale Silva🇪🇸

   The Standard Model Effective Field Theory (SMEFT) is a universal way of parametrizing New Physics (NP) manifesting as new, heavy particle interactions with the Standard Model (SM) degrees of freedom, that respect the SM gauged symmetries. Higher order terms in the NP interactions possibly lead to sizable effects, mandatory for meaningful phenomenological studies, such as contributions to neutral meson mixing, which typically pushes the scale of NP to energy scales much beyond the reach of direct searches in colliders. I discuss the leading-order renormalization of double-insertions of dimension-6 four-fermion operators that change quark flavor by one unit (i.e., $|\Delta F|=1$, $F=$ strange-, charm-, or bottom-flavor), by dimension-8 operators relevant to meson mixing (i.e., $|\Delta F|=2$) in SMEFT. Then, I consider the phenomenological implications of contributions proportional to large Yukawas, setting bounds on the Wilson coefficients of operators of dimension-6 via the leading logarithmic contributions. Given the underlying interest of SMEFT to encode full-fledged models at low energies, this work stresses the need to consider dimension-8 operators in phenomenological applications of dimension-6 operators of SMEFT.

   hep-phPRD(2024)·13 citations
8. 08*

   Discrete $R$-symmetry, Various Energy Scales and Gravitational Waves

   Gongjun Choi🇨🇭 · Weikang Lin🇨🇳 · Tsutomu T. Yanagida🇨🇳

   We present a supersymmetric model where energy scales of a discrete $R$-symmetry breaking ($Z_{6R}$) and cosmic inflation are commonly attributed to the confinement scale of a hidden $Sp(2)$ strong dynamics. Apart from these, SUSY-breaking scale, the Higgsino mass and the right-handed neutrino masses are all shown to stem from $Z_{6R}$ breaking scale inferred from CMB observables. We will show that the model is characterized by the SUSY-breaking soft mass $m_{\mathrm{soft}}\simeq 100-1000\mathrm{TeV}$ and the reheating temperature $T_{\mathrm{rh}}\simeq 10^9\mathrm{GeV}$. Then we discuss how these predictions of the model can be tested with the help of the spectrum of the gravitational wave induced by the short-lived cosmic string present during the reheating era.

   hep-phastro-ph.COhep-thPRD(2022)·4 citations
9. 09*

   Environment Dependent Electron Mass and the H${}_0$-Tension

   Rance Solomon🇺🇸 · Garvita Agarwal🇺🇸 · Dejan Stojkovic🇺🇸

   A difference in the electron mass at recombination from the measured value today has been shown to relieve the Hubble tension. In this article we propose a simple mechanism that would allow for such a mass difference. Similar in form to the Higgs field, we consider a Yukawa coupling between the symmetron scalar field and the electron. However, the symmetron vacuum expectation value depends on the matter density of its environment which, in principle, would allow its contribution towards the electron mass to differ between recombination and today. We detail the coupling and discuss possible observables.

   hep-phgr-qcPRD(2022)·20 citations
10. 10*

    A General Analysis for Observing Quantum Interference at Colliders

    Andrew J. Larkoski🇺🇸

    Despite their inextricable quantum mechanical nature, events at a high energy particle collider experiment typically have very few unambiguous quantum signatures, due the type of data and the manner in which they are collected. We present a general analysis of one feature of quantum mechanics, interference between two orthogonal states on Hilbert space, projected onto the basis of states that span a collider experiment observable space. Identification of quantum interference can be considered as a binary discrimination between a pure state and a mixed state, and we introduce several statistical measures that quantify the amplitude of interference in a pure state with respect to a mixed state that exhibits no interference. Two explicit examples from particle physics are provided to demonstrate features of the general formalism.

    hep-phhep-exPRD(2022)·24 citations
11. 11*

    A review of the tension between the T2K and NO$\nu$A appearance data and hints to new physics

    Ushak Rahaman🇿🇦 · Soebur Razzaque🇿🇦 · S. Uma Sankar🇮🇳

    In this article, we review the status of the tension between the long-baseline accelerator neutrino experiments T2K and NO$\nu$A. The tension arises mostly due to the mismatch in the appearance data of the two experiments. We explain how this tension arises based on ${\nu }_{\mu }\to {\nu }_e$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ oscillation probabilities. We define the reference point of vacuum oscillation, maximal ${\theta }_{23}$ and ${\delta }_{CP}=0$ and compute the ${\nu }_e/{\bar{\nu }}_e$ appearance events for each experiment. We then study the effects of deviating the unknown parameters from the reference point and the compatibility of any given set of values of unknown parameters with the data from T2K and NO$\nu$A. T2K observes a large excess in the ${\nu }_e$ appearance event sample compared to the expected ${\nu }_e$ events at the reference point, whereas \nova observes a moderate excess. The large excess in T2K dictates that ${\delta }_{CP}$ be anchored at $-90^{\circ }$ and that ${\theta }_{23}>\pi /4$ with a preference for normal hierarchy. The moderate excess at NO$\nu$A leads to two degenerate solutions: A) NH, $0<{\delta }_{CP}<180^{\circ }$, and ${\theta }_{23}>\pi /4$; B) IH, $-180^{\circ }<{\delta }_{CP}<0$, and ${\theta }_{23}>\pi /4$. This is the main cause of the tension between the two experiments. We have reviewed the status of three beyond standard model (BSM) physics scenarios, (a) non-unitary mixing, (b) Lorentz invariance violation and (c) non-standard neutrino interactions, to resolve the tension.

    hep-phhep-exhep-thUniverse(2022)·26 citations
12. 12*

    Updated determinations of |V${}_{us}$| with tau decays using new recent estimates of radiative corrections for light-meson leptonic decay rates

    Alberto Lusiani🇮🇹

    We update the |V${}_{us}$| determinations using the HFLAV 2018 report tau branching fraction results with recent new estimates of the $\pi \ell 2$ and $K\ell 2$ radiative corrections. There are minor changes of the central values and uncertainties.

    hep-phhep-exSciPost Phys.Proc.(2025)·2 citations
13. 13*

    Axial-vector form factor of nucleons at finite temperature from the AdS/QCD soft-wall model

    Shahin Mamedov🇦🇿 · Narmin Nasibova🇦🇿

    The axial-vector form factor of the nucleons is studied at a finite temperature using the holographic soft-wall model with the thermal dilaton field. We use the bulk interaction action known from the zero temperature case and apply the profile functions of fields thermalized by the interaction with the thermal dilaton field. The dependence of the axial form factor on the square of the transferred momentum and the temperature is plotted for the ground and excited states of the nucleons.

    hep-phhep-thInt.J.Mod.Phys.A(2023)·8 citations
14. 14*

    Study of bound states in a thermal gas using the S-matrix formalism

    Subhasis Samanta🇵🇱

    We have studied the formation of bound states in a thermal gas in the context of quantum field theory (QFT). We have considered a scalar QFT with ${\phi }^4$ interaction, where $\phi$ is a scalar particle with mass $m$. We have observed the formation of a bound state of $\phi$-$\phi$ type when the coupling constant is negative and its modulus is larger than a certain critical value. We have calculated the contribution of the bound state to the pressure of the thermal gas of the system by using the S-matrix formalism. Our analysis is based on a unitarized one-loop resumed approach in which the theory is finite and well defined for each value of the coupling constant. We have observed that the total pressure as a function of the coupling constant is continuous also at the critical coupling: the jump in pressure due to the sudden appearance of the bound state is exactly cancelled by an analogous jump (but with opposite sign) of the interaction contribution to the pressure.

    hep-ph0 citations
15. 15*

    SUSY Dark Matter Direct Detection Prospects based on $(g-2{)}_{\mu }$

    Manimala Chakraborti🇵🇱 · Sven Heinemeyer🇪🇸 · Ipsita Saha🇯🇵

    An electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) with masses of a few hundred GeV can account for variety of experimental data, assuming the lightest neutralino to be the lightest supersymmetric (SUSY) particle: the non-observation at the LHC searches owing to their small production cross sections, the results for the (upper limit of the) Dark Matter (DM) relic abundance and the DM Direct Detection (DD) limits. Such a light EW sector can in particular explain the reinforced $4.2\sigma$ discrepancy between the experimental result for $(g-2{)}_{\mu }$, and its Standard Model (SM) prediction. Using the improved limits on $(g-2{)}_{\mu }$, we review the predictions for the future prospects of the DD experiments. This analysis is performed for several different realizations of DM in the MSSM: bino, bino/wino, wino and higgsino DM. We find that higgsino, wino and one type of bino scenario can be covered by future DD experiments. Mixed bino/wino and another type of bino DM can reach DD cross sections below the neutrino floor. In these cases future collider experiments must cover the remaining parameter space.

    hep-phMoscow Univ.Phys.Bull.(2022)·8 citations
16. 16*

    Non-factorisable two-loop contribution to $t$-channel single-top production

    Christian Brønnum-Hansen🇩🇪 · Jérémie Quarroz🇩🇪 · Chen-Yu Wang🇩🇪

    We report on a recent computation of the non-factorisable contribution to the two-loop helicity amplitude for $t$-channel single-top production arXiv:2108.09222. This is the last missing piece of the two-loop virtual corrections to this process. We perform analytic integration-by-parts reduction to master integrals and use the auxiliary mass flow method for their fast numerical evaluation. The impact of the non-factorisable corrections to single-top production on experimentally measured observables is estimated.

    hep-ph1 citation
17. 17*

    Why is Parity Restored?

    Jean-Marie Frère🇧🇪

    While Left-Right symmetry (space parity) breaking historically appeared as a surprise, we argue that the real wonder is its restoration in long-distance interactions (at least until we find electric dipole moments!).

    hep-phphysics.pop-phPoS(2022)·0 citations
18. 18*

    Lessons from the LHCb measurement of CP violation in $B_s\to K^{+}{K}^{-}$

    Yosef Nir🇮🇱 · Inbar Savoray🇮🇱 · Yehonatan Viernik🇮🇱

    The LHCb experiment measured the time-dependent CP asymmetries $C_{KK}$ and $S_{KK}$ in $B_s\to K^{+}{K}^{-}$ decay. Combining with the corresponding CP asymmetries $C_{\pi \pi }$ and $S_{\pi \pi }$ in $B\to {\pi }^{+}{\pi }^{-}$ decay, we find that the size of $U$-spin breaking in this system is of order $20\%$. Moreover, the data suggest that these effects are dominated by factorizable contributions. We further study the constraints on new physics contributions to $b\to u\bar{u}q$ ($q=s,d$). New physics that is minimally flavor violating (MFV) cannot be distinguished from the Standard Model (SM) in these decays. However, new physics that is not MFV can mimic large $U$-spin breaking. Requiring that the $U$-spin breaking parameters remain below the size implied by the data leads to a lower bound of $5-10$ TeV on the scale of generic new physics. If the new physics is subject to the selection rules that follow from the Froggatt-Nielsen (FN) mechanism or from General Minimal Flavor Violation (GMFV), the bound is relaxed to 2 TeV.

    hep-phhep-exJHEP(2022)·8 citations
19. 19*

    Search for Charm-quark Production via Dimuons in Neutrino Telescopes

    ChuanLe Sun🇨🇳 · Fuyudi Zhang🇨🇳 · Fan Hu🇨🇳 · Donglian Xu🇨🇳 · Jun Gao🇨🇳

    Dimuon events induced by charm-quark productions from neutrino deep inelastic scattering (DIS) processes have been studied in traditional DIS experiments for decades. The recent progress in neutrino telescopes makes it possible to search such dimuon events at energies far beyond laboratory scale. In this paper, we construct a simulation framework to calculate yields and distributions of dimuon signals in an IceCube-like km3 scale neutrino telescope. Due to experimental limitation in the resolution of double-track lateral distance, only dimuon produced outside the detector volume are considered. Detailed information about simulation results for ten years exposure is demonstrated. Both an earlier work [1] and our work study a similar situation, we therefore use that paper as a baseline to conduct comparisons. We then estimate the impacts of different calculation methods of muon energy losses, and find that, the average energy loss formula used in that work results in more events by contrast with Monte Carlo simulation. Finally, we study the experimental potential of dimuon searches under the hypothesis of single-muon background-only. Our results based on a simplified double-track reconstruction indicate a moderate sensitivity especially with the ORCA configuration. Further developments on both the reconstruction algorithm and possible detector designs are thus required, and are under investigation.

    hep-phhep-exCPC(2023)·4 citations
20. 20*

    Optimized Two-Baryon Operators in Lattice QCD

    Yan Lyu🇨🇳 · Hui Tong🇨🇳 · Takuya Sugiura🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Tetsuo Hatsuda🇯🇵 · Jie Meng🇨🇳 · Takaya Miyamoto🇯🇵

    A set of optimized interpolating operators which are dominantly coupled to each eigenstate of two baryons on the lattice is constructed by the HAL QCD method. To test its validity, we consider heavy dibaryons ${\Omega }_{3Q}{\Omega }_{3Q}$ ($Q=s,c$) calculated by (2+1)-flavor lattice QCD simulations with nearly physical pion mass. The optimized two-baryon operators are shown to provide effective energies of the ground and excited states separately stable as a function of the Euclidean time. Also they agree to the eigenenergies in a finite lattice box obtained from the leading-order HAL QCD potential $V(\mathbf{r})$ within statistical errors. The overlapping factors between the optimized sink operators and the state created by the wall-type source operator indicate that $V(\mathbf{r})$ can be reliably extracted, no matter whether the spacetime correlation of two baryons is dominated by the ground state or the excited state. It is suggested that the optimized set of operators is useful for variational studies of hadron-hadron interactions.

    ↳ hep-lathep-phnucl-thPRD(2022)·15 citations
21. 21*

    Chiral anomaly in (1+1) dimensions revisited: complementary kinetic perspective and universality

    Wei-Han Hsiao🇺🇸 · Chiao-Hsuan Wang🇺🇸

    We reinvestigate the classic example of the chiral anomaly in (1+1) dimensional spacetime. By reviewing the derivation of charge conservation using the semiclassical Boltzmann equation, we show that chiral anomalies could emerge in (1+1) dimensions without Berry curvature corrections to the kinetic theory. The pivotal step depends only on the asymptotic behavior of the distribution function of the quasiparticle--and thus its dispersion relation--in the limit of $\mathbf{p}\to \pm \infty$ rather than the detailed functional form of the dispersion. We address two subjects motivated by this observation. First, we reformulate (1+1)-dimensional chiral anomaly using kinetic theory with the current algebra approach and the gradient expansion of the Dirac Lagrangian, adding a complementary perspective to existing approaches. Second, we demonstrate the universality of the chiral anomaly across various quasiparticle dispersions. For two-band models linear in the temporal derivative, with Fujikawa's method we show it is sufficient to have a chirality-odd strictly monotonic dispersion in order to exhibit the chiral anomaly.

    ↳ hep-thhep-phquant-phJ.Phys.Soc.Jap.(2024)·0 citations
22. 22*

    Cosmogenic production of ${}^{37}$Ar in the context of the LUX-ZEPLIN experiment

    J. Aalbers🇺🇸 · D.S. Akerib🇺🇸 · A.K. Al Musalhi🇬🇧 · F. Alder🇬🇧 · S.K. Alsum🇺🇸 · C.S. Amarasinghe🇺🇸 · A. Ames🇺🇸 · T.J. Anderson🇺🇸 · N. Angelides🇬🇧 · H.M. Araújo🇬🇧 · J.E. Armstrong🇺🇸 · M. Arthurs🇺🇸 and 196 other authors

    We estimate the amount of ${}^{37}$Ar produced in natural xenon via cosmic ray-induced spallation, an inevitable consequence of the transportation and storage of xenon on the Earth's surface. We then calculate the resulting ${}^{37}$Ar concentration in a 10-tonne payload~(similar to that of the LUX-ZEPLIN experiment) assuming a representative schedule of xenon purification, storage and delivery to the underground facility. Using the spallation model by Silberberg and Tsao, the sea level production rate of ${}^{37}$Ar in natural xenon is estimated to be 0.024~atoms/kg/day. Assuming the xenon is successively purified to remove radioactive contaminants in 1-tonne batches at a rate of 1~tonne/month, the average ${}^{37}$Ar activity after 10~tonnes are purified and transported underground is 0.058--0.090~$\mu$Bq/kg, depending on the degree of argon removal during above-ground purification. Such cosmogenic ${}^{37}$Ar will appear as a noticeable background in the early science data, while decaying with a 35~day half-life. This newly-noticed production mechanism of ${}^{37}$Ar should be considered when planning for future liquid xenon-based experiments.

    ↳ hep-exastro-ph.COastro-ph.IMhep-phPRD(2022)·26 citations
23. 23*

    Quantum statistical fluctuation of energy and its novel pseudo-gauge dependence

    Arpan Das🇵🇱

    We discuss the quantum statistical fluctuations of energy in subsystems of hot relativistic gas for both spin-zero and spin half particles. We explicitly show the system size dependence of the quantum statistical fluctuation of energy. Our results show that with decreasing system size quantum statistical fluctuations increase substantially. As the consistency of the framework, we also argue that the quantum statistical fluctuations give rise to the known result for statistical fluctuation of energy in the canonical ensemble if we consider the size of the subsystem to be sufficiently large. For a spin-half particle quantum fluctuations show some interesting novel features. We show that within a small sub-system quantum statistical fluctuation of energy for spin half particles depends on the various pseudo-gauge choices of the energy-momentum tensor. Interestingly, for sufficiently large subsystems quantum fluctuations obtained for different pseudo-gauge choices converge and we recover the canonical-ensemble formula known for statistical fluctuations of energy. Our calculation is very general and can be applied to any branch of physics whenever one deals with a thermal system. As a practical application, we argue that our results can be used to determine a coarse-graining scale to introduce the concept of classical energy density or fluid element relevant for the strongly interacting matter, in particular for small systems produced in heavy-ion collisions.

    ↳ nucl-thhep-phPhys.Scripta(2022)·0 citations
24. 24*

    MEASUREMENT OF THE HIGGS BRANCHING RATIO BR($H\to \gamma \gamma$) AT 3 TeV CLIC

    G. Kacarevic🇷🇸 · I. Bozovic Jelisavcic🇷🇸 · N. Vukasinovic🇷🇸 · I. Smiljanic🇷🇸 · M. Radulovic🇷🇸 · J. Stevanovic🇷🇸 · T. Agatonovic Jovin🇷🇸 · G. Milutinovic Dumbelovic🇷🇸

    In this paper we address the potential of a 3 TeV centre-of-mass energy Compact Linear Collider (CLIC) to measure the branching fraction of the Higgs boson decay to two photons, BR($H\to \gamma \gamma$). Since photons are massless, the Higgs boson coupling to photons is realized through higher order processes involving heavy particles either from the Standard Model or beyond. Any deviation of the measured BR($H\to \gamma \gamma$), and consequently of the Higgs coupling $g_{H\gamma \gamma }$ from the predictions of the Standard Model, may indicate New Physics. The Higgs decay to two photons is thus an interesting probe of the Higgs sector. This study is performed using simulation of the detector for CLIC and by considering all relevant physics and beam-induced processes in a full reconstruction chain. It is shown that the product of the Higgs production cross-section in $W^{+}{W}^{-}$ fusion and BR($H\to \gamma \gamma$) can be measured with a relative statistical uncertainty of 5.5\%, assuming the integrated luminosity of 5 ab${}^{-1}$ and unpolarized beams.

    ↳ physics.acc-phhep-exhep-phPRD(2022)·5 citations
25. 25*

    The fate of the trace anomaly in a finite formulation of field theory

    Jean-François Mathiot🇫🇷

    Within the framework of the recently proposed Taylor-Lagrange regularization scheme - which leads to finite elementary amplitudes in $4$-dimensional space-time with no additional dimensionful scales - we show that the trace of the energy-momentum tensor does not show any anomalous contribution even though quantum corrections are considered. Moreover, since the only renormalization we can think of within this scheme is a finite renormalization of the bare parameters to give the physical ones, the canonical dimension of quantum fields is also preserved by the use of this regularization scheme.

    ↳ hep-thhep-phInt.J.Mod.Phys.A(2021)·1 citation
26. 26*

    Impact of slow conversions on hybrid stars with sequential QCD phase transitions

    Victor P. Goncalves🇧🇷 · Lucas Lazzari🇧🇷

    In this paper, we investigate the impact of the phase conversion speed on the properties of hybrid stars with sequential sharp QCD phase transitions. We consider that these hybrid stars possess an inner (outer) core of CFL (2SC) quark matter surrounded by hadronic matter. Assuming that the phase conversions can be slow or rapid, we analyze the dynamical stability of these objects. In particular, we present our predictions for the mass-radius profile and the fundamental eigenfrequencies of hybrid stars with sequential QCD first order phase transitions. Our results demonstrate that the usual stability criteria i.e. $\partial M/\partial P_0\ge 0$, is sufficient only if both conversions are rapid. Moreover, we show that if any of the interfaces has a slow conversion speed, the fundamental eigenfrequencies are significantly modified.

    ↳ nucl-thhep-phEPJC(2022)·22 citations
27. 27*

    Good and bad diquark properties and spatial correlations in lattice QCD

    Anthony Francis🇨🇭 · Philippe De Forcrand🇨🇭 · Randy Lewis🇨🇦 · Kim Maltman🇨🇦

    We study good, bad and not-even-bad diquarks on the lattice in a gauge-invariant formalism in full QCD. We establish their spectral masses with short extrapolations to the physical point, observing agreement with phenomenological expectations. We find that only the good diquark has attractive quark-quark spatial correlations, with spherical shape and size $\sim 0.6$ fm. Our results provide quantitative support for modelling the low-lying baryon spectrum using good light diquark effective degrees of freedom.

    ↳ hep-lathep-phRev.Mex.Fis.Suppl.(2022)·7 citations
28. 28*

    Searching for dark-matter waves with PPTA and QUIJOTE pulsar polarimetry

    Andrés Castillo🇪🇸 · Jorge Martin-Camalich🇪🇸 · Jorge Terol-Calvo🇪🇸 · Diego Blas🇪🇸 · Andrea Caputo🇮🇱 · Ricardo Tanausú Génova Santos🇪🇸 · Laura Sberna🇩🇪 · Michael Peel🇪🇸 · Jose Alberto Rubiño-Martín🇪🇸

    The polarization of photons emitted by astrophysical sources might be altered as they travel through a dark matter medium composed of ultra light axion-like particles (ALPs). In particular, the coherent oscillations of the ALP background in the galactic halo induce a periodic change on the polarization of the electromagnetic radiation emitted by local sources such as pulsars. Building up on previous works, we develop a new, more robust, analysis based on the generalised Lomb-Scargle periodogram to search for this periodic signal in the emission of the Crab supernova remnant observed by the QUIJOTE MFI instrument and 20 galactic pulsars from the Parkes Pulsar Timing Array (PPTA) project. We also carefully take into account the stochastic nature of the axion field, an effect often overlooked in previous works. This refined analysis leads to the strongest limits on the axion-photon coupling for a wide range of dark matter masses spanning $10^{-23}\text{ eV}\lesssim m_a\lesssim 10^{-19}\text{ eV}$. Finally, we survey possible optimal targets and the potential sensitivity to axionic dark-matter in this mass range that could be achieved using pulsar polarimetry in the future.

    ↳ astro-ph.COhep-phJCAP(2022)·42 citations
29. 29*

    Scheme dependence of two-loop HTLpt-resummed ${\text{SYM}}_{4,4}$ thermodynamics

    Qianqian Du🇨🇳 · Ubaid Tantary🇺🇸 · Michael Strickland🇺🇸

    The resummed thermodynamics of $\mathcal{N}=4$ supersymmetric Yang-Mills theory in four space-time dimensions (${\text{SYM}}_{4,4}$) has been calculated previously to two loop order within hard thermal loop perturbation theory (HTLpt) using the canonical dimensional regularization (DRG) scheme. Herein, we revisit this calculation using the regularization by dimensional reduction (RDR) scheme. Since the RDR scheme manifestly preserves supersymmetry it is the preferred scheme, however, it is important to assess if and by how much the resummed perturbative results depend on the regularization scheme used. Comparing predictions for the scaled entropy obtained using the DRG and RDR schemes we find that for $\lambda \lesssim 6$ they are numerically very similar. We then compare the results obtained in both schemes with the strict perturbative result, which is accurate up to order ${\lambda }^2$, and a generalized Padé approximant constructed from the known large-$N_c$ weak- and strong-coupling expansions. Comparing the strict perturbative expansion of the two-loop HTLpt result with the perturbative expansion to order ${\lambda }^2$, we find that both the DRG and RDR HTLpt calculations result in the same scheme-independent predictions for the coefficients at order $\lambda$, ${\lambda }^{3/2}$, and ${\lambda }^2\log \lambda$, however, at order ${\lambda }^2$ there is a residual regularization scheme dependence.

    ↳ hep-thhep-phPRD(2022)·1 citation

* 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.