Wed·Dec 11, 2019Wednesday·December 11, 2019

1. 01*

   Revisiting $X(3872)\to D^0{\bar{D}}^0{\pi }^0$ in XEFT

   Lin Dai🇺🇸 · Feng-Kun Guo🇨🇳 · Thomas Mehen🇺🇸

   The calculation of the decay $X(3872)\to D^0{\bar{D}}^0{\pi }^0$ in effective field theory is revisited to include final state ${\pi }^0{D}^0$, ${\pi }^0{\bar{D}}^0$and $D^0{\bar{D}}^0$ rescattering diagrams. These introduce significant uncertainty into the prediction for the partial width as a function of the binding energy. The differential distribution in the pion energy is also studied for the first time. The normalization of the distribution is again quite uncertain due to higher order effects but the shape of the distribution is unaffected by higher order corrections. Furthermore the shape of the distribution and the location of the peak are sensitive to the binding energy of $X(3872)$. The shape is strongly impacted by the presence of virtual $D^{\ast 0}$ graphs which highlights the molecular nature of the $X(3872)$. Measurement of the pion energy distribution in the decay $X(3872)\to D^0{\bar{D}}^0{\pi }^0$ can reveal interesting information about the binding nature of the $X(3872)$.

   hep-phPRD(2020)·28 citations
2. 02*

   Hyperon resonances and meson-baryon interactions in isospin 1

   K. P. Khemchandani🇧🇷 · A. Martinez Torres🇧🇷 · J. A. Oller🇪🇸

   In this work we extend our formalism to study meson-baryon interactions by including $s$- and $u$-channel diagrams for pseudoscalar-baryon systems. We study the coupled systems with strangeness $-1$ and focus on studying the isospin-1 resonance(s), especially in the energy region around 1400 MeV. By constraining the model parameters to fit the cross section data available on several processes involving relevant channels, we find resonances in the isoscalar as well as the isovector sector in the energy region around 1400 MeV.

   hep-phnucl-th1 citation
3. 03*

   Towards a full solution of relativistic Boltzmann equation for quark-gluon matter on GPUs

   Jun-Jie Zhang🇨🇳 · Hong-Zhong Wu🇨🇳 · Shi Pu🇨🇳 · Guang-You Qin🇨🇳 · Qun Wang🇨🇳

   We have developed a numerical framework for a full solution of the relativistic Boltzmann equations for the quark-gluon matter using the multiple Graphics Processing Units (GPUs) on distributed clusters. Including all the $2\to 2$ scattering processes of 3-flavor quarks and gluons, we compute the time evolution of distribution functions in both coordinate and momentum spaces for the cases of pure gluons, quarks and the mixture of quarks and gluons. By introducing a symmetrical sampling method on GPUs which ensures the particle number conservation, our framework is able to perform the space-time evolution of quark-gluon system towards thermal equilibrium with high performance. We also observe that the gluons naturally accumulate in the soft region at the early time, which may indicate the gluon condensation.

   hep-phhep-exnucl-thphysics.comp-phPRD(2020)·11 citations
4. 04*

   ${\Xi }_{bb}$ and ${\Omega }_{bbb}$ molecular states

   J.M. Dias🇨🇳 · Qi-Xin Yu🇨🇳 · Wei-Hong Liang🇨🇳 · Zhi-Feng Sun🇨🇳 · Ju-Jun Xie🇨🇳 · E. Oset🇪🇸

   Using the vector-exchange interaction in the local hidden gauge approach, which in the light quark sector generates the chiral Lagrangian, and has produced realistic results for ${\Omega }_c,{\Xi }_c,{\Xi }_b$ and the hidden charm pentaquark states, we study the meson-baryon interactions in the coupled channels that lead to the ${\Xi }_{bb}$ and ${\Omega }_{bbb}$ excited states of the molecular type. We obtain seven states of the ${\Xi }_{bb}$ type with energies between $10408$ and $10869$ MeV and one ${\Omega }_{bbb}$ state at $15212$ MeV.

   hep-phCPC(2020)·12 citations
5. 05*

   Heavy $K^{\ast }(4307)$ meson with hidden charm

   X.-L. Ren🇩🇪 · B. B. Malabarba🇧🇷 · L.-S. Geng🇨🇳 · K. P. Khemchandani🇧🇷 · A. Martinez Torres🇧🇷

   We report on a robust prediction of heavy $K^{\ast }$ meson by solving the Faddeev equations with fixed-center approximation for the three-body $KD{\bar{D}}^{\ast }$ system. As the excited Kaon state, $K^{\ast }$ is an exotic hidden charm meson with $M-i\Gamma /2=4307\pm 2-i9\pm 2$ MeV and $I(J^P)=1/2(1^{-})$. We further performed the evaluation of the decay width of $K^{\ast }(4307)$ to the open two-body channels. We expect that the above findings inspire an experimental investigation of this exotic $K^{\ast }$ meson and to study the so far unexplored heavy strange meson sector.

   hep-ph1 citation
6. 06*

   Theoretical status of ${\epsilon }^{\prime }/\epsilon$

   V. Cirigliano🇺🇸 · H. Gisbert🇩🇪 · A. Pich🇪🇸 · A. Rodríguez-Sánchez🇸🇪

   We briefly overview the historical controversy around Standard Model predictions of ${\epsilon }^{\prime }/\epsilon$ and clarify the underlying physics. A full update of this important observable is presented, with all known short- and long-distance contributions, including isospin-breaking corrections. The current Standard Model prediction, $\mathrm{Re}({\epsilon }^{\prime }/\epsilon )=(14\pm 5)\cdot 10^{-4}$, is in excellent agreement with the experimentally measured value.

   hep-phhep-exJ.Phys.Conf.Ser.(2020)·20 citations
7. 07*

   Dynamic Structure of Hadrons in ChPT

   A. Aleksejevs🇨🇦 · S. Barkanova🇨🇦

   The Chiral Perturbation Theory (ChPT) has been very successful in describing low-energy hadronic properties in the non-perturbative regime of Quantum Chromodynamics. The results of ChPT, many of which are currently under active experimental investigation, provide stringent predictions of many fundamental properties of hadrons, including quantities such as electromagnetic polarizabilities. The paper outlines our semi-automated calculations in ChPT, the corresponding results for the electric and magnetic polarizabilities of the proton and our predictions for Compton differential cross sections.

   hep-phnucl-thPoS(2019)·0 citations
8. 08*

   Isospin-breaking contributions to ${\epsilon }^{\prime }/\epsilon$

   V. Cirigliano🇺🇸 · H. Gisbert🇩🇪 · A. Pich🇪🇸 · A. Rodríguez-Sánchez🇸🇪

   We present an updated analysis of isospin-violating corrections to ${\epsilon }^{\prime }/\epsilon$ in the framework of chiral perturbation theory, taking advantage of the currently improved knowledge on quark masses and nonperturbative parameters. The role of the different ingredients entering into the analysis is carefully assessed. Our final result is ${\Omega }_{\mathrm{eff}}=0.110{}_{-0.088}^{+0.090}$.

   hep-phhep-exhep-latJ.Phys.Conf.Ser.(2020)·6 citations
9. 09*

   Radiative contribution to $p_{\perp }$-broadening of fast partons in a quark-gluon plasma

   B.G. Zakharov🇷🇺

   The contribution of radiative processes to $p_{\perp }$-broadening of fast partons in a quark-gluon plasma is investigated. Calculations are performed beyond the soft gluon approximation. It is shown that the radiative correction to $⟨p_{\perp }^2⟩$ for conditions of heavy ion collisions at RHIC and LHC is negative and can be comparable in absolute value with the nonradiative contribution. This prediction differs radically from the essentially positive contribution of radiative processes to $p_{\perp }$-broadening, which was predicted earlier in the literature.

   hep-phnucl-thJ.Exp.Theor.Phys.(2019)·6 citations
10. 10*

    Supersymmetric Proton Decay Revisited

    John Ellis🇨🇭 · Jason L. Evans🇰🇷 · Natsumi Nagata🇯🇵 · Keith A. Olive🇺🇸 · Liliana Velasco-Sevilla🇳🇴

    Encouraged by the advent of a new generation of underground detectors---JUNO, DUNE and Hyper-Kamiokande---that are projected to improve significantly on the present sensitivities to various baryon decay modes, we revisit baryon decay in the minimal supersymmetric SU(5) GUT. We discuss the phenomenological uncertainties associated with hadronic matrix elements and the value of the strong coupling ${\alpha }_s$---which are the most important---the weak mixing angle ${\theta }_W$, quark masses including one-loop renormalization effects, quark mixing and novel GUT phases that are not visible in electroweak interaction processes. We apply our analysis to a variety of CMSSM, super- and sub-GUT scenarios in which soft supersymmetry-breaking parameters are assumed to be universal at, above and below the GUT scale, respectively. In many cases, we find that the next generation of underground detectors should be able to probe models with sparticle masses that are $\mathcal{O}(10)$~TeV, beyond the reach of the LHC.

    hep-phhep-exEPJC(2020)·48 citations
11. 11*

    On-Shell Electroweak Sector and the Higgs Mechanism

    Brad Bachu🇺🇸 · Akshay Yelleshpur🇺🇸

    We take the first steps towards an entirely on-shell description of the bosonic electroweak sector of the Standard Model. We write down on-shell three particle amplitudes consistent with Poincare' invariance and little group covariance. Tree-level, four particle amplitudes are determined by demanding consistent factorization on all poles and correct UV behaviour. We present expressions for these $2\to 2$ scattering amplitudes using massive spinor helicity variables. We show that on-shell consistency conditions suffice to derive relations between the masses of the $W^{\pm },Z$, the Weinberg angle and the couplings. This provides a completely on-shell description of the Higgs mechanism without any reference to the vacuum expectation value of the Higgs field.

    ↳ hep-thhep-phJHEP(2020)·43 citations
12. 12*

    A refined machinery to calculate large moments from coupled systems of linear differential equations

    Johannes Blümlein🇩🇪 · Peter Marquard🇩🇪 · Carsten Schneider🇦🇹

    The large moment method can be used to compute a large number of moments of physical quantities that are described by coupled systems of linear differential equations. Besides these systems the algorithm requires a certain number of initial values as input, that are often hard to derive in a preprocessing step.Thus a major challenge is to keep the number of initial values as small as possible. We present the basic ideas of the underlying large moment method and present refined versions that reduce significantly the number of required initial values.

    ↳ cs.SChep-phphysics.comp-ph6 citations
13. 13*

    Wilson-line Scalar as a Nambu-Goldstone Boson in Flux Compactifications and Higher-loop Corrections

    Masaki Honda🇯🇵 · Toshihide Shibasaki🇯🇵

    We study a scalar zero mode originated from extradimensional components of a gauge field in a six-dimensional theory compactified on a magnetized torus. We confirm it is a Nambu-Goldstone boson of the translational symmetry on the torus which is breaking spontaneously due to magnetic flux. We also show explicitly it is massless up to the two-loop level. Moreover, we discuss full order contributions by considering the effective potential.

    ↳ hep-thhep-phJHEP(2020)·15 citations
14. 14*

    Calculating the static gravitational two-body potential to fifth post-Newtonian order with Feynman diagrams

    Stefano Foffa🇨🇭 · Pierpaolo Mastrolia🇮🇹 · Riccardo Sturani🇧🇷 · Christian Sturm🇩🇪 · William J. Torres Bobadilla🇪🇸

    We discuss the first-time calculation of the static gravitational two-body potential up to fifth post-Newtonian(PN) order. The results are achieved through a manifest factorization property of the odd PN diagrams. The factorization property is illustrated also at first and third PN order.

    ↳ gr-qchep-phPoS(2019)·4 citations
15. 15*

    Two-color phase-of-the-phase spectroscopy applied to nonperturbative electron-positron pair production in strong oscillating electric fields

    J. Braß🇩🇪 · R. Milbradt🇩🇪 · S. Villalba-Chávez🇩🇪 · G. G. Paulus🇩🇪 · C. Müller🇩🇪

    Production of electron-positron pairs from vacuum in strong bichromatic electric fields, oscillating in time with a fundamental frequency and its second harmonic, is studied. Strong-field processes occuring in such field configurations are generally known to be sensitive to the relative phase between the field modes. Phase-of-the-phase spectroscopy has recently been introduced in the context of strong-field photoionization as a systematic means to analyze these coherence effects. We apply this method to field-induced pair production by calculating the phase dependence of the momentum-resolved particle yields. We show that asymmetric checkerboard patterns arise in the phase-of-the-phase spectra, similarly to those found in strong-field photoionization. The physical origin of these characteristic structures, which differ between the created electron and positron, are discussed.

    ↳ physics.atom-phhep-phPRA(2020)·7 citations
16. 16*

    Dispersive Two-Loop Calculations: Methodology and Applications

    A. Aleksejevs🇨🇦 · S. Barkanova🇨🇦

    As the new-generation precision experiments such as MOLLER and P2 look for physics beyond Standard Model, it is becoming increasingly important to evaluate the higher-order electroweak radiative corrections to a sub-percent level of uncertainty. However, due to propagators with different masses and higher-order tensor Feynman integrals, the two-loop calculations involving thousands of Feynman graphs become a demanding task requiring novel computational approaches. In this paper, we describe our dispersive sub-loop insertion approach and develop two-loop integrals using two-point functions basis which is applicable to wide range of processes.

    ↳ hep-thhep-phPoS(2019)·1 citation
17. 17*

    Doublet-Triplet Splitting in Fertile Left-Right Symmetric Heterotic String Vacua

    Alon E. Faraggi🇬🇧 · Glyn Harries🇬🇧 · Benjamin Percival🇬🇧 · John Rizos🇬🇷

    Classification of Left-Right Symmetric (LRS) heterotic-string vacua in the free fermionic formulation, using random generation of generalised GSO (GGSO) projection coefficients, produced phenomenologically viable models with probability $4\times 10^{-11}$. Extracting substantial number of phenomenologically viable models requires modification of the classification method. This is achieved by identifying phenomenologically amenable conditions on the Generalised GSO projection coefficients that are randomly generated at the $SO(10)$ level. Around each of these fertile cores we perform a complete LRS classification, generating viable models with probabilility $1.4\times 10^{-2}$, hence increasing the probability of generating phenomenologically viable models by nine orders of magnitude, and producing some $1.4\times 10^5$ such models. In the process we identify a doublet-triplet selection mechanism that operates in twisted sectors of the string models that break the $SO(10)$ symmetry to the Pati-Salam subgroup. This mechanism therefore operates as well in free fermionic models with Pati-Salam and Standard-like Model $SO(10)$ subgroups.

    ↳ hep-thhep-phNPB(2020)·22 citations
18. 18*

    Can Future Observation of the Living Partner Post-tag the Past Decayed State in Entangled Neutral K-Mesons ?

    Jose Bernabeu🇪🇸 · Antonio Di Domenico🇮🇹

    Entangled neutral K-mesons allow the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation-in-time between the two partners: the past state of the first decayed kaon, when it was entangled before its decay, is post-tagged by the result and the time of the future observation of the second decay channel. This surprising "from future to past" effect is fully observable and leads to the unique experimental tag of the KS-state, an unsolved problem since the discovery of CP violation.

    ↳ quant-phhep-phPRD(2022)·16 citations
19. 19*

    Geometric General Solution to the $U(1)$ Anomaly Equations

    B. C. Allanach🇬🇧 · Ben Gripaios🇬🇧 · Joseph Tooby-Smith🇬🇧

    Costa et al. [Phys. Rev. Lett. 123, 151601 (2019)] recently gave a general solution to the anomaly equations for $n$ charges in a $U(1)$ gauge theory. `Primitive' solutions of chiral fermion charges were parameterised and it was shown how operations performed upon them (concatenation with other primitive solutions and with vector-like solutions) yield the general solution. We show that the ingenious methods used there have a simple geometric interpretation, corresponding to elementary constructions in number theory. Viewing them in this context allows the fully general solution to be written down directly, without the need for further operations. Our geometric method also allows us to show that the only operation Costa et al. require is permutation. It also gives a variety of other, qualitatively similar, parameterisations of the general solution, as well as a qualitatively different (and arguably simpler) form of the general solution for $n$ even.

    ↳ hep-thhep-phmath-phmath.MPJHEP(2020)·25 citations
20. 20*

    Constraining the QCD phase diagram at finite temperature and density

    Owe Philipsen🇩🇪

    Neither the chiral limit nor finite baryon density can be simulated directly in lattice QCD, which severely limits our understanding of the QCD phase diagram. In this review I collect results for the phase structure in an extended parameter space of QCD, with varying numbers of flavours, quark masses, colours, lattice spacings, imaginary and isospin chemical potentials. Such studies help in understanding the underlying symmetries and degrees of freedom, and are beginning to provide a consistent picture constraining the possibilities for the physical phase diagram.

    ↳ hep-lathep-phnucl-thPoS(2019)·60 citations
21. 21*

    Breaking the 2-loop barrier for generalized IBP reduction

    A.A. Radionov🇷🇺 · F.V. Tkachov🇷🇺

    We discuss the problem of constructing differential operators for the generalized IBP reduction algorithms at the 2-loop level. A deeply optimized software allows one to efficiently construct such operators for the first non-degenerate 2-loop cases. The most efficient approach is found to be via the so-called partial operators that are much simpler than the complete ones, and that affect the power of only one of the polynomials in the product.

    ↳ hep-thhep-phPhysics of Particles and Nuclei, 2020, Vo…·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.