Fri·Jan 18, 2019Friday·January 18, 2019

1. 01*

   Gaugino Portal Baryogenesis

   Aaron Pierce🇺🇸 · Bibhushan Shakya🇺🇸

   We study baryogenesis via a gaugino portal, the supersymmetric counterpart to the widely studied kinetic mixing portal, to a hidden sector. CP and baryon number violating decays of a hidden sector gaugino into the visible sector can produce the observed baryon asymmetry of the Universe. The tiny portal coupling is crucial in producing late out-of-equilibrium decays, after washout processes that can erase the asymmetry have gone out of equilibrium. We study this mechanism within various scenarios, including freeze-in or freeze-out of the hidden gaugino, as well as extended frameworks where the hidden sector contains a weakly interacting massive particle (WIMP) dark matter candidate. This mechanism can produce the desired asymmetry over a wide range of mass scales, including for hidden gaugino masses as low as 10 GeV. We also discuss possible related signals with direct collider searches, at low energy experiments, and in dark matter direct and indirect detection.

   hep-phJHEP(2019)·23 citations
2. 02*

   Semileptonic decays of anti-triplet charmed baryons

   Chao-Qiang Geng🇨🇳 · Chia-Wei Liu🇹🇼 · Tien-Hsueh Tsai🇹🇼 · Shu-Wei Yeh🇹🇼

   We study the semileptonic decays ${\mathbf{B}}_{\mathbf{c}}\to {\mathbf{B}}_{\mathbf{n}}{\ell }^{+}{\nu }_{\ell }$ where ${\mathbf{B}}_{\mathbf{c}(\mathbf{n})}$ is the anti-triplet-charmed (octet) baryon with the $SU(3{)}_f$ flavor symmetry and helicity formalism. In particular, we present the decay branching ratios of ${\mathbf{B}}_{\mathbf{c}}\to {\mathbf{B}}_{\mathbf{n}}{\ell }^{+}{\nu }_{\ell }$ in three scenarios: (a) an exact $SU(3{)}_f$ symmetry with equal masses for the anti-triplet-charmed (octet) baryon states of ${\mathbf{B}}_{\mathbf{c}}$ (${\mathbf{B}}_{\mathbf{n}}$), (b) $SU(3{)}_f$ parameters without the baryonic momentum-transfer dependence, and (c) $SU(3{)}_f$ with baryonic transition form factors in the heavy quark limit. We show that our results are all consistent with the existing data. Explicitly, we predict that $\mathcal{B}({\Xi }_c^{+}\to {\Xi }^0{e}^{+}{\nu }_e)=(11.9\pm 1.3,9.8\pm 1.1,10.7\pm 0.9)\times 10^{-2}$ and $\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{e}^{+}{\nu }_e)=(3.0\pm 0.3,2.4\pm 0.3,2.7\pm 0.2)\times 10^{-2}$ in the scenarios (a), (b) and (c) agree with the data of $(14.0_{-8.7}^{+8.3})\times 10^{-2}$ and $(5.6\pm 2.6)\times 10^{-2}$ from the CLEO Collaboration, respectively. In addition, we obtain that $\mathcal{B}({\Lambda }_c^{+}\to n{e}^{+}{\nu }_e)=(2.8\pm 0.4,4.9\pm 0.4,5.1\pm 0.4)\times 10^{-3}$ in (a), (b) and (c). We also examine the longitudinal asymmetry parameters of $\alpha ({\mathbf{B}}_{\mathbf{c}}\to {\mathbf{B}}_{\mathbf{n}}{\ell }^{+}{\nu }_{\ell })$, which are sensitive to the different scenarios with $SU(3{)}_f$. Some of the decay branching ratios and asymmetries can be observed by the ongoing experiments at BESIII and LHCb as well as the future searches by BELLEII.

   hep-phhep-exPLB(2019)·62 citations
3. 03*

   Vector-like Quark Interpretation of Excess in Higgs Signal Strength

   Kingman Cheung🇹🇼 · Wai-Yee Keung🇺🇸 · Jae Sik Lee🇰🇷 · Po-Yan Tseng🇯🇵

   There is a $+2\sigma$ deviation in the average Higgs-signal strength for all the $7+8+13$ TeV data up to Summer 2018. We find that a slight reduction of the bottom-Yukawa coupling can fit the data better than the standard model. We suggest an extension with a vector-like quark doublet, of which the right-handed component of $b^{\prime }$ mixes nonnegligibly with the standard model $b$ quark. We show that the mixing would induce a reduction of the bottom Yukawa coupling. Simultaneously, the coupling of the $Z$ boson to the right-handed $b$ quark increases, which could reduce the forward-backward asymmetry of bottom production at LEP and bring it closer to the experimental value.

   hep-phPLB(2019)·1 citation
4. 04*

   Unveiling CP property of top-Higgs coupling with graph neural networks at the LHC

   Jie Ren🇨🇳 · Lei Wu🇨🇳 · Jin Min Yang🇨🇳

   The top-Higgs coupling plays an important role in particle physics and cosmology. The precision measurements of this coupling can provide an insight to new physics beyond the Standard Model. In this paper, we propose to use Message Passing Neural Network (MPNN) to reveal the CP nature of top-Higgs interaction through semi-leptonic channel $pp\to t(\to b{\ell }^{-}{\nu }_{\ell })\bar{t}(\to \bar{b}jj)h(\to b\bar{b})$. Using the test statistics constructed from the event classification probabilities given by the MPNN, we find that the pure CP-even and CP-odd components can be well distinguished at the LHC, with at most 300 fb${}^{-1}$ experimental data.

   hep-phhep-exPLB(2020)·71 citations
5. 05*

   $\Omega NN$ and $\Omega \Omega N$ states

   H. Garcilazo🇲🇽 · A. Valcarce🇪🇸

   The lattice QCD analysis of the HAL QCD Collaboration has recently derived $\Omega N$ and $\Omega \Omega$ interacting potentials with nearly physical quark masses ($m_{\pi }\simeq$ 146 MeV and $m_K\simeq$ 525 MeV). They found an attractive interaction in the $\Omega N$ ${}^5{S}_2$ channel which supports a bound state with a central binding energy of 1.54 MeV. The $\Omega \Omega$ ${}^1{S}_0$ channel shows an overall attraction with a bound state with a central binding energy of 1.6 MeV. In this paper we looked closely at the $\Omega NN$ and $\Omega \Omega N$ three-body systems making use of the latest HAL QCD Collaboration $\Omega N$ and $\Omega \Omega$ interactions. Our results show that the $\Omega d$ system in the state with maximal spin $(I)J^P=(0)5/2^{+}$ is bound with a binding energy of about 20 MeV. The $(I)J^P=(1)3/2^{+}$ $\Omega nn$ state presents a resonance decaying to $\Lambda \Xi n$ and $\Sigma \Xi n$, with a separation energy of $\sim$ 1 MeV. The $(I)J^P=(1/2)1/2^{+}$ $\Omega \Omega N$ state also exhibits a resonance decaying to $\Lambda \Xi \Omega$ and $\Sigma \Xi \Omega$, with a separation energy of $\sim$ 4.6 MeV. We have calculated the contribution of the Coulomb potential to differentiate among the different charged states.

   hep-phnucl-thPRC(2019)·24 citations
6. 06*

   Spontaneous baryogenesis in spiral inflation

   Gabriela Barenboim🇪🇸 · Wan-Il Park🇰🇷

   We examined the possibility of spontaneous baryogenesis driven by the inflaton in the scenario of \textit{spiral inflation}, and found the parametric dependence of the late-time baryon number asymmetry. As a result, it is shown that, depending on the effective coupling of baryon/lepton number violating operators, it is possible to obtain the right amount of asymmetry even in the presence of a matter-domination era as long as such era is relatively short. In a part of the parameter space, the required expansion rate during inflation is close to the current upper-bound, and hence can be probed in the near future experiments.

   hep-phEPJC(2019)·4 citations
7. 07*

   Dark Matter phenomenology : from simplified WIMP models to refined alternative solutions

   Mathias Pierre🇫🇷

   One of the most puzzling problems of modern physics is the identification of the nature a non-relativistic matter component present in the universe, contributing to more than 25$\%$ of the total energy budget, known as Dark Matter. Weakly Interacting Massive Particles (WIMPs) are among the best motivated dark matter candidates. However, in light of non conclusive detection signals and strong constraints from collider, direct and indirect detection experiments, this thesis presents constraints on several realizations of the WIMP paradigm in the context of simplified dark matter models. More elaborated models considering extended gauge structures are discussed further on, such as constructions involving generalized Chern-Simons couplings and a specific WIMP scenario motivated by recently observed flavour anomalies related to the $R_{K^{(\ast )}}$ observable. The second part of this thesis is devoted to the discussion of an alternative dark matter thermal production mechanism where an explicit realization of the Strongly Interacting Massive Particles (SIMPs) paradigm is discussed in the context of a non-Abelian hidden gauge structure. In a last part, the possibility of producing non-thermally a dark matter component via the "freeze-in" mechanism was investigated and the strong impact of the post-inflationary reaheating stage of the universe on such constructions illustrated by the specific case where dark matter density production is mediated by a heavy spin-2 field in addition to the standard graviton.

   hep-phastro-ph.CO4 citations
8. 08*

   Rapidity dependent transverse momentum spectra of heavy quarkonia produced in small collision systems at the LHC

   Li-Na Gao🇨🇳 · Fu-Hu Liu🇨🇳 · Bao-Chun Li🇨🇳

   The rapidity dependent transverse momentum spectra of heavy quarkonia (J/psi and Upsilon mesons) produced in small collision systems such as proton-proton (pp) and proton-lead (p-Pb) collisions at center-of-mass energy (per nucleon pair) 5-13 TeV are described by a two-component statistical model which is based on the Tsallis statistics and inverse power-law. The experimental data measured by the LHCb Collaboration at the Large Hadron Collider (LHC) are well fitted by the model results. The related parameters are obtained and the dependences of parameters on rapidity are analyzed.

   hep-phhep-exnucl-exnucl-thAdv.High Energy Phys.(2019)·6 citations
9. 09*

   TOTEM data and the real part of the hadron elastic amplitude at 13 TeV

   J.R. Cudell🇧🇪 · O.V. Selyugin🇷🇺

   We analyse the 13 TeV TOTEM data on elastic proton-proton scattering through a thorough statistical analysis, and obtain that $\rho =0.096\pm 0.006$ and ${\sigma }_{tot}=(107.5\pm 1.5)$ mb. Theoretical errors could lower the cross section by about 2 mb and increase $\rho$ by about 0.002. We also show that these results do not imply the existence of an odderon at $t=0$.

   hep-ph15 citations
10. 10*

    Unification, Proton Decay and Topological Defects in non-SUSY GUTs with Thresholds

    Joydeep Chakrabortty🇮🇳 · Stephen F. King🇬🇧 · Rinku Maji🇮🇳

    We calculate the proton lifetime and discuss topological defects in a wide class of non-supersymmetric (non-SUSY) $SO(10)$ and $E(6)$ Grand Unified Theories (GUTs), broken via left-right subgroups with one or two intermediate scales (a total of 9 different scenarios with and without D-parity), including the important effect of threshold corrections. By performing a goodness of fit test for unification using the two-loop renormalisation group evolution equations (RGEs), we find that the inclusion of threshold corrections significantly affects the proton lifetime, allowing several scenarios, which would otherwise be excluded, to survive. Indeed we find that the threshold corrections are a saviour for many non-SUSY GUTs. For each scenario we analyse the homotopy of the vacuum manifold to estimate the possible emergence of topological defects.

    hep-phhep-thPRD(2019)·64 citations
11. 11*

    Electroweak phase transition in the presence of hypermagnetic field and the generation of gravitational waves

    H. Abedi🇮🇷 · M. Ahmadvand🇮🇷 · S. S. Gousheh🇮🇷

    We investigate the effects of a large-scale background hypermagnetic field on the electroweak phase transition. We propose a model in which an effective weak angle varies during the electroweak phase transition and upon its use we show that, although for the majority of the parameter space the phase transition is a crossover, there are tiny regions in which the phase transition occurs in two steps and can be first-order. We obtain all of the important quantities characterizing the details of the first-order phase transition, including the latent heat, transition temperature and duration. We then calculate the gravitational wave energy spectrum generated during the first-order part of the electroweak phase transition and find that, for strong enough background hypermagnetic fields, these signals can be detected by the Ultimate-DECIGO interferometer.

    hep-phgr-qchep-thJ.Phys.G(2022)·6 citations
12. 12*

    Superheavy objects composed of nuclear and dark matter

    Vakhid A. Gani🇷🇺 · Maxim Yu. Khlopov🇷🇺 · Dmitry N. Voskresensky🇷🇺

    We consider a model of $O$He atomic dark matter formed by Coulomb binding of the hypothetical stable double-charged massive $O^{--}$ particles with nuclei of primordial helium. Such a dark matter can be captured by ordinary matter forming superheavy nuclei. We propose a possibility of self-bound by nuclear and electromagnetic interaction $O$-nuclearites as well as more massive gravitating ones and discuss effect of accumulation of $O$He atoms in stars and their effect in stellar evolution.

    hep-phastro-ph.COnucl-thJ.Phys.Conf.Ser.(2019)·0 citations
13. 13*

    MSSM Higgs Benchmark Scenarios for Run 2 and Beyond: the low $\tan \beta$ region

    Henning Bahl🇩🇪 · Stefan Liebler🇩🇪 · Tim Stefaniak🇩🇪

    We propose two new benchmark scenarios for Higgs-boson searches in the Minimal Supersymmetric Standard Model (MSSM). These scenarios are specifically designed for the low $\tan \beta$ region. A light Higgs-boson mass prediction compatible with the observed value of $125$ GeV is ensured in almost the entire parameter space by employing a flexible supersymmetric (SUSY) mass scale, reaching values of up to $10^{16}$ GeV. The MSSM Higgs-sector predictions are evaluated in an effective field theory (EFT) framework that exhibits a Two-Higgs-Doublet-Model at the low scale. In the first scenario all SUSY particles are relatively heavy, whereas the second scenario features light neutralinos and charginos. Both scenarios are largely compatible with the most recent results from Run 2 of the LHC, and we highlight the main phenomenological features relevant for future LHC searches. In particular, we provide a detailed discussion of heavy Higgs-boson decays to neutralinos and charginos in the second scenario, and the arising collider signatures, in order to facilitate the design of dedicated LHC searches in the near future.

    hep-phEPJC(2019)·65 citations
14. 14*

    A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector

    Nathan P. Hartland🇳🇱 · Fabio Maltoni🇧🇪 · Emanuele R. Nocera🇳🇱 · Juan Rojo🇳🇱 · Emma Slade🇬🇧 · Eleni Vryonidou🇨🇭 · Cen Zhang🇨🇳

    We present a novel framework for carrying out global analyses of the Standard Model Effective Field Theory (SMEFT) at dimension-six: SMEFiT. This approach is based on the Monte Carlo replica method for deriving a faithful estimate of the experimental and theoretical uncertainties and enables one to construct the probability distribution in the space of the SMEFT degrees of freedom. As a proof of concept of the SMEFiT methodology, we present a first study of the constraints on the SMEFT provided by top quark production measurements from the LHC. Our analysis includes more than 30 independent measurements from 10 different processes at 8 and 13 TeV such as inclusive top-quark pair and single-top production and the associated production of top quarks with weak vector bosons and the Higgs boson. State-of-the-art theoretical calculations are adopted both for the Standard Model and for the SMEFT contributions, where in the latter case NLO QCD corrections are included for the majority of processes. We derive bounds for the 34 degrees of freedom relevant for the interpretation of the LHC top quark data and compare these bounds with previously reported constraints. Our study illustrates the significant potential of LHC precision measurements to constrain physics beyond the Standard Model in a model-independent way, and paves the way towards a global analysis of the SMEFT.

    hep-phhep-exJHEP(2019)·300 citations
15. 15*

    New Physics in Double Higgs Production at Future $e^{+}{e}^{-}$ Colliders

    Andres Vasquez🇧🇷 · Celine Degrande🇧🇪 · Alberto Tonero🇨🇦 · Rogerio Rosenfeld🇧🇷

    We study the effects of new physics in double Higgs production at future $e^{+}{e}^{-}$ colliders. In the Standard Model the chiral limit ($m_e=0$) plays an important role for this process, being responsible for the smallness of the tree-level diagrams with respect to the 1-loop contributions. In our work, we consider the possibility of an enhancement due to the contribution of Standard Model dimension-six effective operators. We show that there are only two relevant operators for this process that are not yet (strongly) constrained by other data. We perform a sensitivity study on the operator coefficients for several benchmark values of energy and integrated luminosity related to the proposed linear colliders such as CLIC, ILC and FCC-ee and we derive expected 95% CL limits for each benchmark scenario.

    hep-phJHEP(2019)·10 citations
16. 16*

    Direct ellipsoidal fitting of discrete multi-dimensional data

    Rafey Anwar🇺🇸 · Madeline Hamilton🇺🇸 · Pavel Nadolsky🇺🇸

    Multi-dimensional distributions of discrete data that resemble ellipsoids arise in numerous areas of science, statistics, and computational geometry. We describe a complete algebraic algorithm to determine the quadratic form specifying the equation of ellipsoid for the boundary of such multi-dimensional discrete distribution. In this approach, the equation of ellipsoid is reconstructed using a set of matrix equations from low-dimensional projections of the input data. We provide a Mathematica program realizing the full implementation of the ellipsoid reconstruction algorithm in an arbitrary number of dimensions. To demonstrate its many potential uses, the fast reconstruction method is applied to quasi-Gaussian statistical distributions arising in elementary particle production at the Large Hadron Collider.

    ↳ physics.data-anhep-phphysics.comp-phSMU Journal of Undergraduate Research, vo…·0 citations
17. 17*

    Secular evolution of compact binaries revolving around a spinning massive black hole

    Yun Fang🇨🇳 · Qing-Guo Huang🇨🇳

    The leading order effect of the spin of a distant supermassive black hole (SMBH) on the orbit of compact binary revolving around it appears at the 1.5 post Newtonian (PN) expansion through coupling with the inner and outer orbital angular momenta, and makes an oscillating characteristic contribution to the secular evolution of the compact binary eccentricity over a long time scale compared to the Kozai-Lidov dynamics caused by a non-spinning SMBH.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2019)·22 citations
18. 18*

    New self-consistent mean field approximation and its application in strong interaction phase transition

    Fei Wang🇨🇳 · Yakun Cao🇨🇳 · Yonghui Dia · Hongshi Zong🇨🇳

    In this letter, taking the Nambu--Jona--Lasinio model as an example, we propose a new self-consistent mean field approximation method by means of Fierz transformation. This new self-consistent mean field approximation introduces a new free parameter $\alpha$ to be determined by experiments and when $\alpha$ takes 0.5, it reduces to the mean field approximation that was commonly used in the past. Then based on this self-consistent mean field approximation, we study the influence of the undetermined parameter $\alpha$ on the phase diagram of the two-flavor strong interaction matter. It is found that the value of $\alpha$ plays an extremely important role in the study of strong interaction phase diagram. It not only changes the position of the phase transition point of strong interaction matter, but also affects the order of phase transition, for example, when $\alpha$ is greater than the critical value ${\alpha }_c=0.71$, then the strong interaction matter phase diagram no longer exists critical end point. In addition, in the case of zero temperature and finite density, we also found that when $\alpha$ is greater than 1.044, the pseudo-critical chemical potential is about 4$\sim$5 times the saturation density of the nuclear matter, which agrees with the expected results from the image of hadrons degree of freedom. The resulting equations of state of strong interaction matter at low temperatures and high densities will have an important impact on the study of the mass radius relationship of neutron stars and the merging process of binary neutron stars.

    ↳ nucl-thhep-phCPC(2019)·29 citations
19. 19*

    Measurement of directed flow of $D^0$ and $\overline{D^0}$ mesons in 200 GeV Au+Au collisions at RHIC using the STAR detector

    Liang He (for the STAR Collaboration)🇺🇸

    Charm quarks, owing to their large mass, are produced predominantly in the initial hard scatterings in heavy-ion collisions, and therefore can be a valuable tool for studying the early time dynamics of these collisions. The rapidity-odd directed flow at mid-rapidity in heavy-ion collisions originates from a tilt in the reaction plane of the thermalized medium caused by the asymmetry between the number of participants from projectile and target nuclei as a function of rapidity. Recently, it has been predicted that the slope of the directed flow at mid-rapidity for $D^0$ mesons, arising from the transport of charm quarks in the tilted medium, can be several times larger than that of light flavor hadrons. The magnitude of the slope is expected to be sensitive to the magnitude of the tilt and the charm quark drag coefficient in the medium. It has also been predicted that the transient electromagnetic field generated at early time can induce a much larger directed flow for heavy quarks than for light quarks. In these proceedings, we will report on the first measurement of the directed flow for the $D^0$ and ${\bar{D}}^0$ mesons as a function of rapidity in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV using high statistics data collected with the Heavy Flavor Tracker in 2014 and 2016 RHIC runs.

    ↳ nucl-exhep-exhep-phnucl-thPoS(2019)·3 citations
20. 20*

    Double Higgs boson production and Higgs self-coupling extraction at CLIC

    Philipp Roloff🇨🇭 · Ulrike Schnoor🇨🇭 · Rosa Simoniello🇨🇭 · Boruo Xu🇬🇧

    The Compact Linear Collider (CLIC) is a future electron-positron collider that will allow measurement of the trilinear Higgs self-coupling in double Higgs boson events produced at its high-energy stages with collision energies of $\sqrt{s}$ = 1.5 and 3 TeV. The sensitivity to the Higgs self-coupling is driven by the measurements of the cross section and the invariant mass distribution of the Higgs-boson pair in the W-boson fusion process, e${}^{+}$e${}^{-}\to$HH${\nu }_e{\bar{\nu }}_e$. It is enhanced by including the cross-section measurement of ZHH production at 1.5 TeV. The expected sensitivity of CLIC for Higgs pair production through W-boson fusion is studied for the decay channels bbbb and bbWW using full detector simulation including all relevant backgrounds. With an integrated luminosity of $\mathcal{L}$ = 5 ab${}^{-1}$ at $\sqrt{s}$ = 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of $-8\%$ and $+11\%$ at $68\%$ C.L., assuming the Standard Model.

    ↳ hep-exhep-phEPJC(2020)·80 citations
21. 21*

    Axion production in unstable magnetized plasmas: an active source of dark-matter

    J. T. Mendonça🇵🇹 · J. D. Rodrigues🇵🇹 · H. Terças🇵🇹

    Axions, the hypothetical particles restoring the charge-parity symmetry in the strong sector of the Standard Model, and one of the most prone candidates for dark matter, are well-known to interact with plasmas. In a recent publication [Phys. Rev. Lett. {\bf 120}, 181803 (2018)], we have shown that if the plasma dynamically responds to the presence of axions, then a new quasi-particle (the axion plasmon-polariton) can be formed, being at the basis of a new generation of plasma-based detection techniques. In this work, we exploit the axion-plasmon hybridization to actively produce axions in streaming magnetized plasmas. We show that, if we make the plasma unstable via the injection of an energetic electron beam (beam-plasma instability), an appreciable production rate of few axions per minute can be achieved. The produced axions can then be detected by Primakoff decay into photons.

    ↳ physics.plasm-phhep-phhep-thPRD(2020)·43 citations
22. 22*

    Spin of Primordial Black Holes

    Mehrdad Mirbabayi🇮🇹 · Andrei Gruzinov🇺🇸 · Jorge Noreña🇨🇱

    Primordial black holes, formed from rare peaks in the primordial fluctuations $\zeta$, are non-rotating at zeroth order in ${\zeta }_{\mathrm{rms}}$. We show that the spin also vanishes at first order in ${\zeta }_{\mathrm{rms}}$, suggesting the dimensionless spin parameter $a_{\mathrm{rms}}\sim {\zeta }_{\mathrm{rms}}^2$. We identify one quadratic contribution to the spin by calculating (and extrapolating to the formation time) the torque on a black hole due to ambient acoustic waves. For a reasonable density of primordial black holes this implies a percent level spin parameter.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2020)·153 citations
23. 23*

    Charmonia decay widths in magnetized matter using a model for composite hadrons

    Amruta Mishra🇮🇳 · S.P. Misra🇮🇳

    The decay widths of the charmonium states to $D\bar{D}$ in isospin asymmetric nuclear matter in the presence of a magnetic field are studied, using a field theoretical model for composite hadrons with quark/antiquark constituents. The medium modifications of these partial decay widths arise due to the changes in the masses of the decaying charmonium state and the produced $D$ and $\bar{D}$ mesons in the magnetized hadronic matter, calculated within a chiral effective model. The decay widths are computed using the light quark--antiquark pair creation term of the free Dirac Hamiltonian in terms of the constituent quark field operators. The results of the present investigation are compared with the in-medium decay widths obtained within the ${}^3{P}_0$ model. Within the ${}^3{P}_0$ model, the charmonium decay widths are calculated using the creation of a light quark--antiquark pair in the ${}^3{P}_0$ state. In the presence of a magnetic field, the Landau level contributions give rise to positive shifts in the masses of the charged $D$ and $\bar{D}$ mesons. This leads to the decay of charmonium to the charged $D^{+}{D}^{-}$ to be suppressed as compared to the neutral $D\bar{D}$ pair in symmetric nuclear matter, whereas in asymmetric nuclear matter, the larger mass drop of the $D^{+}{D}^{-}$ pair, as compared to the $D^0\overline{D^0}$ pair leads to the production of charged open charm meson pairs to be enhanced as compared to the charmonium decay channel to $D^0\overline{D^0}$.

    ↳ nucl-thhep-ph5 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.