A bstract Deep learning methods have been increasingly adopted to study jets in particle physics. Since symmetry-preserving behavior has shown be an important factor for improving the performance of deep many applications, Lorentz group equivariance — a fundamental spacetime symmetry elementary particles recently incorporated into model jet tagging. However, design is computationally costly due analytic construction high-order tensors. In this article, we introduce LorentzNet, new The...

We study the purely leptonic decays of $W^\pm \to e^\pm μ^\mp ν$ and $μ^\pm μ^\pm e^\mp produced at LHC, induced by sterile neutrinos with mass $m_N$ below $M_W$ in intermediate state. Since final state neutrino escapes detection, one cannot tell whether this process violates lepton number, what would indicate a Majorana character for neutrino. Our shows that when mixings electrons muons are different enough, can still discriminate between Dirac simply counting comparing above decay rates....

Recently, both ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) announced their observations of an excess diphoton events around invariant mass 750 GeV with a local significance 3.6σ 2.6σ, respectively. In this paper, we interpret as on-shell production real singlet scalar in pp → S γγ channel. To accommodate observed rate, further introduce vector-like fermion F, which carries color electric charges. The viable regions model parameters are explored for simple extension...

In light of the latest neutrino oscillation data, we revisit minimal scenario type-I seesaw model, in which only two heavy right-handed Majorana neutrinos are introduced to account for both tiny masses and baryon number asymmetry our Universe. this framework, carry out a systematic study Frampton-Glashow-Yanagida ansatz by taking into renormalization-group running mixing parameters flavor effects leptogenesis. We demonstrate that normal mass ordering is disfavored even supersymmetric...

It remains to be determined experimentally if massive neutrinos are Majorana or Dirac particles. In this connection, it has been recently suggested that the detection of cosmic neutrino background left-handed $\nu^{}_{\rm L}$ and right-handed antineutrinos $\overline{\nu}^{}_{\rm R}$ in future experiments capture on beta-decaying nuclei (e.g., $\nu^{}_e + {^3{\rm H}} \to {^3}{\rm He} e^-$ for PTOLEMY experiment) is likely distinguish between neutrinos, since rate twice larger former case....

We embed $\mu-\tau$ reflection symmetry into the minimal seesaw formalism, where two right-handed neutrinos are added to Standard Model of particle physics. Assuming that both left- and neutrino fields transform under symmetry, we obtain required forms Dirac mass matrix Majorana for neutrinos. To investigate phenomenology at low energies, first consider breaking due renormalization group running, then systematically study various schemes by introducing explicit terms high energies.

A weak singlet charged scalar exists in many new physics models beyond the Standard Model. In this work, we show that a light with mass above 65 GeV is still allowed by LEP and LHC data. The interactions of Model particles are described operators up to dimension 5. Dominant decay modes obtained, subtlety involving field redefinition gauge fixing due dimension-5 operator also clarified. We demonstrate it promising observe at LHC.

We present the results of a numerical search for Dirac Yukawa matrices Standard Model, consistent with quark and lepton masses their mixing angles. assume diagonal up-quark matrix, natural in $\bs{\m Z_7 \rtimes \m Z_3}$, Bimaximal or Tri-bimaximal seesaw mixing, $SU(5)$ unification to relate down-quark charged using Georgi-Jarlskog mechanisms. The measured value $\theta_{13}$ requires an asymmetric matrix. Satisfying values both electron mass restricts number solutions, underlying...

The standard model of cosmology predicts the existence cosmic neutrino background in present Universe. To detect relic neutrinos vicinity Earth, it is necessary to evaluate gravitational clustering effects on Milky Way. Here we introduce a reweighting technique N-one-body simulation method, so that single can yield density profiles for different masses and phase space distributions. In light current experimental results favor small masses, number contrast around Earth found be almost...

The Schechter-Valle theorem states that a positive observation of neutrinoless double-beta ($0\nu \beta \beta$) decays implies finite Majorana mass term for neutrinos when any unlikely fine-tuning or cancellation is absent. In this note, we reexamine the quantitative impact theorem, and find current experimental lower limits on half-lives $0\nu \beta$-decaying nuclei have placed restrictive upper bound neutrino $|\delta m^{ee}_\nu| < 7.43 \times 10^{-29}~{\rm eV}$ radiatively generated at...

The Littlest Seesaw (LS) model involves two right-handed neutrinos and a very constrained Dirac neutrino mass matrix, involving one texture zero independent masses, leading to highly predictive scheme in which all masses the entire PMNS matrix is successfully predicted terms of just real parameters. We calculate renormalisation group (RG) corrections LS predictions, with without supersymmetry, including also threshold effects induced by decoupling heavy Majorana both analytically...

In light of the latest neutrino oscillation data, we revisit minimal scenario type-I seesaw model, in which only two heavy right-handed Majorana neutrinos are introduced to account for both tiny masses and baryon number asymmetry our Universe. this framework, carry out a systematic study Frampton-Glashow-Yanagida ansatz by taking into renormalization-group running mixing parameters flavor effects leptogenesis. We demonstrate that normal mass ordering is disfavored even supersymmetric...

Motivated by tremendous progress in neutrino oscillation experiments, we derive a new set of simple and compact formulas for three-flavor probabilities matter constant density. A useful definition the $\eta$-gauge mass-squared difference $\Delta^{}_* \equiv \eta \Delta^{}_{31} + (1-\eta) \Delta^{}_{32}$ is introduced, where $\Delta^{}_{ji} m^2_j - m^2_i$ $ji = 21, 31, 32$ are ordinary differences $0 \leq 1$ real positive parameter. Expanding terms $\alpha \Delta^{}_{21}/\Delta^{}_*$,...

In light of the latest neutrino oscillation data, we examine whether leptonic flavor mixing matrix can take on an exact form tri-bimaximal (TBM), golden-ratio (GR) or bimaximal (BM) pattern at a superhigh-energy scale, where such could be realized by symmetry, and become compatible with experimental data low-energy scale. Within framework Minimal Supersymmetric Standard Model (MSSM), only hope for realizing possibility is to count corrections from renomalization-group (RG) running. this work...

We present a toy model in which the Higgs sector fields transform as non-Abelian representations of family symmetry group, and consider possibility that extra partners particles act messengers for both supersymmetry breakings. Although such mediation schemes generically produce dependent soft breaking terms at messenger scale, we demonstrate existence focusing mechanism may erase hierarchies through renormalization group running.

The atomic transition from an excited state $|\mathrm{e}⟩$ to the ground $|\mathrm{g}⟩$ by emitting a neutrino pair and photon, i.e., $|\mathrm{e}⟩\ensuremath{\rightarrow}|\mathrm{g}⟩+|\ensuremath{\gamma}⟩+|{\ensuremath{\nu}}_{i}⟩+|{\overline{\ensuremath{\nu}}}_{j}⟩$ with $i$, $j=1$, 2, 3, has been proposed Yoshimura his collaborators as alternative way determine absolute scale ${m}_{0}$ of masses. More recently, statistical analysis fine structure photon spectrum this process performed [N....

We consider a restricted type-I seesaw scenario with four texture zeros in the neutrino Yukawa matrix, weak basis where both charged-lepton matrix and Majorana mass for right-handed neutrinos are diagonal real. Inspired by grand unified theories, we further require to exhibit hierarchical pattern similar that up-type quark matrix. With such hierarchy requirement, find leptogenesis, which would operate an ${N}_{2}$-dominated asymmetry generated next-to-lightest ${N}_{2}$, can greatly reduce...

Motivated by recent intensive experimental efforts on searching for neutrinoless double-beta decays, we perform a detailed analysis of the physics potential experiments based $^{76}\mathrm{Ge}$. Assuming no signals, current and future could place $90\%$ lower limit half life $T^{0\nu}_{1/2} \gtrsim 4\times 10^{26}~{\rm yr}$ 7\times 10^{27}~{\rm yr}$, respectively. Then, how to report an evidence decays is addressed following Bayesian statistical approach. For first time, present quantitative...

The simple correlation among three lepton flavor mixing angles (θ 12, θ 13, 23) and the leptonic Dirac CP-violating phase δ is conventionally called a sum rule of mixing, which may be derived from class neutrino mass models with symmetries. In this paper, we consider solar 12 ≈ + 13 cos δ, where stems constant pattern in sector takes value = 45° for bi-maximal (BM), $$ {\theta}_{12}^{\nu } { \tan}^{-1}\left(1/\sqrt{2}\right) \approx 35.3{}^{\circ} tri-bimaximal (TBM) or...

Orphanin FQ, also known as nociceptin (NC),is a well-known ligand for opioid receptor-like ORL1 receptor. This heptadecapeptide was identified potently inhibiting the uptake of rat dopamine transporter (rDAT) which is stably expressed in CHO cells (designated D8 cells). Further kinetic analysis proved that this occurs through competitive inhibition with an IC50 about 1.9 μM. FQ inhibits [3H]dopamine by striatal synaptosomes, confirmed effect orphanin on cells. found to inhibit GABA type 1...

A weak singlet charged scalar exists in many new physics models beyond the standard model. The discovery potential of is explored at future lepton colliders, e.g., CEPC, ILC-350, and ILC-500. We demonstrate that one can discover up to 118 GeV CEPC with an integrated luminosity $5\text{ }\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$. At ILC-350 ILC-500 $1\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$ such a limit be further improved 136 160 GeV, respectively.