Mon·Jan 17, 2022Monday·January 17, 2022

1. 01*

   The Structure of Flavor Mixing and Reconstruction of the Mass Matrix

   Guojun Xu🇨🇳 · Jingjun Zhang🇨🇳 · Chenzi Liao🇨🇳 · Ying Zhang🇨🇳

   The Fermion flavor structure is investigated by bilinear decomposition of the mass matrix after EW symmetry breaking, and the roles of factorized matrices in flavor mixing and mass generation are explored. It is shown that flavor mixing can be addressed as an independent issue. On a new Yukawa basis, the minimal parameterization of flavor mixing is realized containing two relative phases and two free $SO(2{)}_L$ rotation angles. The validity of the flavor mixing structure is checked in both the lepton and quark sectors. Under the decomposition of flavor mixing, fermion mass matrices are reconstructed under the hierarchy limit. A flat mass matrix with all elements equal to 1 arises naturally from the requirement that homology exists between up-type and down-type fermion mass matrices. Some hints of a flat matrix and flavor breaking are also discussed.

   hep-phInt.J.Mod.Phys.A(2023)·2 citations
2. 02*

   TMDs for spin-1 hadrons

   S. Kumano🇯🇵 · Qin-Tao Song🇨🇳

   Transverse-momentum-dependent parton distribution functions (TMDs) were investigated at the twists 3 and 4 for spin-1 hadrons in addition to the twist-2 ones. They were found by studying all the possible decomposition of a quark correlation function in a Lorentz-invariant way with the Hermiticity and parity invariance. The time-reversal invariance was not imposed for the TMDs due to an active role of gauge links; however, they were used for collinear parton distribution functions (PDFs) by integrating the TMDs over the transverse momentum. We found that 30 TMDs exist in the tensor-polarized spin-1 hadron at the twists 3 and 4, whereas there are 10 TMDs at the twist 2. We also showed that there are 3 collinear PDFs at the twists 3 and 4. The corresponding TMD fragmentation functions exist sat the twists 2, 3, and 4 simply by changing function names and variables. Since the time-reversal invariance is valid in the collinear PDFs, the integrals of time-reversal-odd TMDs over the transverse momentum should vanish. It leads to the sum rules $\int d^2{k}_T{h}_{1LT}(x,k_T^2)=\int d^2{k}_T{g}_{LT}(x,k_T^2)=\int d^2{k}_T{h}_{LL}(x,k_T^2)=\int d^2{k}_T{h}_{3LL}(x,k_T^2)=0$ on the time-reversal odd TMDs at the twists 3 and 4.

   hep-phhep-exhep-latnucl-thJPS Conf.Proc.(2022)·4 citations
3. 03*

   Chiral phase transition of a dense, magnetized and rotating quark matter

   S. M. A. Tabatabaee Mehr🇮🇷 · F. Taghinavaz🇮🇷

   We investigate the chiral symmetry restoration/breaking of a dense, magnetized and rotating quark matter within the Nambu Jona-Lasinio model including $N_f=2$ and $N_c=3$ numbers of flavors and colors, respectively. Imposing the spectral boundary conditions, as well as the positiveness of energy levels, lead to a correlation between the magnetic and rotation fields such that strongly magnetized plasma can not rotate anymore. We solve the gap equation at zero and finite temperature. At finite temperature and baryon chemical potential ${\mu }_B$, we sketch the phase diagrams $T_c({\mu }_B)$ and $T_c(R\Omega )$ in different cases. As a result, we always observe inverse-rotational catalysis mean to decrease $T_c$ by increasing $R\Omega$. But the magnetic field has a more complex structure in the phase diagram. For slowly rotating plasma, we find that $T_c$ decreases by increasing $eB$, while in the fast rotating plasma we see that $T_c$ increases by increasing $eB$. Also, we locate exactly the position of Critical End Point by solving the equations of first and second derivatives of effective action with respect to the order parameters, simultaneously.

   hep-phhep-thnucl-thAnnals Phys.(2023)·14 citations
4. 04*

   Semi-annihilating dark matter coupled with Majorons

   Takumi Miyagi🇯🇵 · Takashi Toma🇯🇵

   The thermal production mechanism of dark matter is attractive and well-motivated by predictivity. A representative of this type of dark matter candidate is the canonical, weakly interacting massive particles. An alternative is semi-annihilating dark matter, which exhibits different phenomenological aspects from the former example. In this study, we constructed a model of dark matter semi-annihilating into a pair of anti-dark matter and a Majoron based on a global $U(1{)}_{B-L}$ symmetry, and show that semi-annihilation induces the core formation of dark matter halos, which can alleviate the so-called small-scale problems. In addition, the box-shaped spectrum of neutrinos was produced by the subsequent decay of the Majoron. This can be a distinctive signature of the dark matter in the model. We find a parameter space where the produced neutrinos can be detected by the future large-volume neutrino detector Hyper-Kamiokande. We also compared the dark matter scenario with the case of halo core formation by the strongly self-interacting dark matter.

   hep-phastro-ph.COastro-ph.HEJHEP(2022)·7 citations
5. 05*

   The String+${}^3{P}_0$ Model of Hadronization

   Xavier Artru🇫🇷 · Albi Kerbizi🇮🇹

   We present the main theoretical aspects of the quantum mechanical string+${}^3{P}_0$ model of polarized quark fragmentation for pseudoscalar and vector meson production. The model is an extension of the Lund string fragmentation model that systematically includes the quark spin degree of freedom assuming the ${}^3{P}_0$ mechanism of quark pair production at string breaking. The recently achieved introduction of vector mesons accounts for the spin correlations between the latter and the quark of the fragmentation chain. The string+${}^3{P}_0$ model reproduces transverse spin effects such as the Collins effect and the dihadron asymmetry, and longitudinal spin effects such as the jet handedness.

   hep-phJPS Conf.Proc.(2022)·2 citations
6. 06*

   Visible energy and angular distributions of the charged particle from the $\tau -$decay in $b\to c\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ reactions

   N. Penalva · E. Hernández · J. Nieves

   We study the $d^2{\Gamma }_d/(d\omega d\cos {\theta }_d)$, $d{\Gamma }_d/d\cos {\theta }_d$ and $d{\Gamma }_d/d{E}_d$ distributions, which are defined in terms of the visible energy and polar angle of the charged particle from the $\tau -$decay in $b\to c\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ reactions. The first two contain information on the transverse tau-spin, tau-angular and tau-angular-spin asymmetries of the $H_b\to H_c\tau {\bar{\nu }}_{\tau }$ parent decay and, from a dynamical point of view, they are richer than the commonly used one, $d^2{\Gamma }_d/(d\omega d{E}_d)$, since the latter only depends on the tau longitudinal polarization. We pay attention to the deviations with respect to the predictions of the standard model (SM) for these new observables, considering new physics (NP) operators constructed using both right- and left-handed neutrino fields, within an effective field-theory approach. We present results for ${\Lambda }_b\to {\Lambda }_c\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ and $\bar{B}\to D^{(\ast )}\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ sequential decays and discuss their use to disentangle between different NP models. In this respect, we show that $d{\Gamma }_d/d\cos {\theta }_d$, which should be measured with sufficiently good statistics, becomes quite useful, especially in the $\tau \to \pi {\nu }_{\tau }$ mode. The study carried out in this work could be of special relevance due to the recent LHCb measurement of the lepton flavor universality ratio ${\mathcal{R}}_{{\Lambda }_c}$ in agreement with the SM. The experiment identified the $\tau$ using its hadron decay into ${\pi }^{-}{\pi }^{+}{\pi }^{-}{\nu }_{\tau }$, and this result for ${\mathcal{R}}_{{\Lambda }_c}$, which is in conflict with the phenomenology from the $b$-meson sector, needs confirmation from other tau reconstruction channels.

   hep-phJHEP(2022)·15 citations
7. 07*

   Can NSI affect non-local correlations in neutrino oscillations?

   Bhavna Yadav🇮🇳 · Trisha Sarkar🇮🇳 · Khushboo Dixit🇮🇳 · Ashutosh Kumar Alok🇮🇳

   Non-local correlations in entangled systems are usually captured by measures such as Bell's inequality violation. It was recently shown that in neutrino systems, a measure of non-local advantage of quantum coherence (NAQC) can be considered as a stronger measure of non-local correlations as compared to the Bell's inequality violation. In this work, we analyze the effects of non standard interaction (NSI) on these measures in the context of two flavour neutrino oscillations for DUNE, MINOS, T2K, KamLAND, JUNO and Daya Bay experimental set-ups. We find that even in the presence of NSI, Bell's inequality violation occurs in the entire energy range whereas the NAQC violation is observed only in some specific energy range justifying the more elementary feature of NAQC. Further, we find that NSI can enhance the violation of NAQC and Bell's inequality parameter in the higher energy range of a given experimental set-up; these enhancements being maximal for the KamLAND experiment. However, the possible enhancement in the violation of the Bell's inequality parameter over the standard model prediction can be up to 11% whereas for NAQC it is 7%. Thus although NAQC is a comparatively stronger witness of nonclassicality, it shows lesser sensitivity to NSI effects in comparison to the Bell's inequality parameter.

   hep-phquant-phEPJC(2022)·14 citations
8. 08*

   $\text{tapir}$: A tool for topologies, amplitudes, partial fraction decomposition and input for reductions

   Marvin Gerlach🇩🇪 · Florian Herren🇺🇸 · Martin Lang🇩🇪

   The demand for precision predictions in the field of high energy physics has dramatically increased over recent years. Experiments conducted at the LHC, as well as precision measurements at the intensity frontier such as Belle II require equally precise theoretical predictions to make full use of the acquired data. To match the experimental precision, two-, three- and, for certain quantities, even higher-loop calculations are required. To facilitate such calculations, computer software automating as many steps as possible is required. Yet, each calculation poses different challenges and thus, a high level of configurability is required. In this context we present $\text{tapir}$: a tool for identification, manipulation and minimization of Feynman integral families. It is designed to integrate in $\text{FORM}$-based toolchains which is common practice in the field. $\text{tapir}$ can be used to reduce the complexity of multi-loop problems with cut-filters, topology mapping, partial fraction decomposition and alike.

   hep-phComput.Phys.Commun.(2023)·73 citations
9. 09*

   Standardizing Platinum Dainotti-correlated gamma-ray bursts, and using them with standardized Amati-correlated gamma-ray bursts to constrain cosmological model parameters

   Shulei Cao🇺🇸 · Maria Dainotti🇯🇵 · Bharat Ratra🇺🇸

   We show that the Platinum gamma-ray burst (GRB) data compilation, probing the redshift range $0.553\le z\le 5.0$, obeys a cosmological-model-independent three-parameter fundamental plane (Dainotti) correlation and so is standardizable. While they probe the largely unexplored $z\sim 2.3-5$ part of cosmological redshift space, the GRB cosmological parameter constraints are consistent with, but less precise than, those from a combination of baryon acoustic oscillation (BAO) and Hubble parameter [$H(z)$] data. In order to increase the precision of GRB-only cosmological constraints, we exclude common GRBs from the larger Amati-correlated A118 data set composed of 118 GRBs and jointly analyze the remaining 101 Amati-correlated GRBs with the 50 Platinum GRBs. This joint 151 GRB data set probes the largely unexplored $z\sim 2.3-8.2$ region; the resulting GRB-only cosmological constraints are more restrictive, and consistent with, but less precise than, those from $H(z)$ + BAO data.

   ↳ astro-ph.COgr-qchep-phhep-thMNRAS(2022)·82 citations
10. 10*

    Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to black holes being seeds of high-redshifted supermassive black holes

    Kazunori Kohri🇯🇵 · Toyokazu Sekiguchi🇯🇵 · Sai Wang🇨🇳

    In this paper, we study scenarios of the super-Eddington accretion onto black holes at high redshifts $z>10$, which are expected to be seeds to evolve to supermassive black holes until redshift $z\sim 7$. For an initial mass, $M_{\mathrm{BH},\mathrm{ini}}\lesssim 2\times 10^3{M}_{\odot }$ of a seed BH, we definitely need the super-Eddington accretion, which can be applicable to both astrophysical and primordial origins. Such an accretion disk inevitably emitted high-energy photons which had heated the cosmological plasma of the inter-galactic medium continuously from high redshifts. In this case, the cosmic history of cosmological gas temperature is modified, by which the absorption feature of the cosmological 21 cm lines is suppressed. By comparing theoretical predictions of the 21cm line absorption with the observational data at $z\sim 17$, we obtain a cosmological upper bound on the mass-accretion rate as a function of the seed BH masses. In order to realize $M_{\mathrm{BH}}\sim 10^9{M}_{\odot }$ at $z\sim 7$ by a continuous mass-accretion on to a seed BH, to be consistent with the cosmological 21cm line absorption at $z\sim 17$, we obtained an severe upper bound on the initial mass of the seed BH to be $M_{\mathrm{BH},\mathrm{ini}}\lesssim 10^2{M}_{\odot }$ ($M_{\mathrm{BH},\mathrm{ini}}\lesssim 10^6{M}_{\odot }$) when we assume a seed BH with its comoving number density $n_{\mathrm{seed},0}\sim 10^{-3}{\mathrm{Mpc}}^{-3}$ ($n_{\mathrm{seed},0}\sim 10^{-7}{\mathrm{Mpc}}^{-3}$). We also discuss some implications for application to primordial black holes as the seed black holes.

    ↳ astro-ph.COastro-ph.HEgr-qchep-phPRD(2022)·18 citations
11. 11*

    Leading order mesonic and baryonic SU(3) low energy constants from $N_f=3$ lattice QCD

    Gunnar S. Bali🇩🇪 · Sara Collins🇩🇪 · Wolfgang Söldner🇩🇪 · Simon Weishäupl🇩🇪

    We determine the leading order mesonic~($B_0$ and $F_0$) and baryonic~($m_0$, $D$ and $F$) SU(3) chiral perturbation theory low energy constants from lattice QCD. We employ gauge ensembles with $N_f=3$ (i.e., $m_u=m_d=m_s$) non-perturbatively improved Wilson fermions at six distinct values of the lattice spacing in the range $a\approx (0.039-0.098)$ fm, which constitute a subset of the Coordinated Lattice Simulations (CLS) gauge ensembles. The pseudoscalar meson mass $M_{\pi }$ ranges from around $430$ MeV down to $240$ MeV and the linear spatial lattice extent $L$ from $6.4M_{\pi }^{-1}$ to $3.3M_{\pi }^{-1}$, where $L{M}_{\pi }\ge 4$ for the majority of the ensembles. This allows us to perform a controlled extrapolation of all the low energy constants to the chiral, infinite volume and continuum limits. We find the SU(3) chiral condensate and $F_0$ to be smaller than their SU(2) counterparts while the Gell-Mann--Oakes--Renner parameters $B_0\approx B$ are similar. Regarding baryonic LECs, we obtain $F/D=0.612_{(12)}^{(14)}$.

    ↳ hep-lathep-phPRD(2022)·32 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.