Charm Decays Research Articles

Analysis of 2S singly heavy baryons in HQET

In this paper, we have employed HQET to determine the masses of radially excited ([Formula: see text]) S-wave charm and bottom baryons. The HQET Lagrangian containing the non-perturbative parameters is shown with heavy baryon fields. The non-perturbative parameters, couplings, and decay widths are also studied for the S-wave singly heavy baryons. The HQET parameters [Formula: see text], [Formula: see text] and [Formula: see text] are calculated for the ground state ([Formula: see text]) using the masses of S-wave baryons. The [Formula: see text] mass short-distance mass scheme is employed to estimate the heavy quark masses and non-perturbative parameters. The mass term ratios of [Formula: see text] and [Formula: see text] mesons and baryons containing parameters [Formula: see text] and [Formula: see text] are studied by varying the bottom quark mass. This analysis shows that heavy quarks behave the same inside mesons and baryons in both 1S and 2S states. The HQET symmetry of [Formula: see text] is used to find the parameters and masses for [Formula: see text] S-wave baryons. The variation of mass of 2S baryons with the non-perturbative parameters [Formula: see text] and [Formula: see text] is discussed. The Regge trajectories are also plotted in the [Formula: see text] plane using masses of [Formula: see text] and 2 charm and bottom baryons. The Regge trajectories are parallel and equidistant lines in the [Formula: see text] plane. We have also studied the strong decays of charm and bottom baryons for both [Formula: see text] and [Formula: see text] states. We have estimated the coupling constants [Formula: see text] and [Formula: see text] for [Formula: see text], and [Formula: see text] for [Formula: see text]. We have also shown the semi-electronic decay rates of charm baryons in the spectator heavy quark approximation for [Formula: see text], [Formula: see text], and [Formula: see text] transitions. The decay rates for [Formula: see text] transitions are of the same order as [Formula: see text] transitions. This analysis agrees well with the available theoretical and experimental data.

Constraining |Vcs| and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

We study the available data on exclusive leptonic and semileptonic c → sℓ+ν decays within the Standard Model and beyond. Our analysis accounts for theory correlations between the relevant hadronic matrix elements through application of dispersive bounds. We find that, within a global analysis, the dispersive bounds are generally well respected and only mildly affect the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcs|. Assuming Standard Model dynamics, we obtainVcs=0.957±0.003,\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$ \\left|{V}_{cs}\\right|=0.957\\pm 0.003, $$\\end{document}which is compatible with the HFLAV/PDG reference value |Vcs| = 0.975 ± 0.006 at the 2.7σ level. Our findings lead to significant deficits in the second-row and second-column unitarity relations of the CKM matrix. Allowing for beyond the SM contributions in the Weak Effective Theory, we find very strong constraints on potential (pseudo)scalar and tensor effects. However, the data still permits sizeable CP-violating right-handed currents.

Missing energy plus jet in the SMEFT

We study the production of dineutrinos in proton-proton collisions, with large missing transverse energy and an energetic jet as the experimental signature. Recasting a search from the ATLAS collaboration we work out constraints on semileptonic four-fermion operators, gluon and electroweak dipole operators and Z-penguins in the SMEFT. All but the Z-penguin operators experience energy-enhancement. Constraints on gluon dipole operators are the strongest, probing new physics up to 14 TeV, and improve over existing ones from collider studies. Limits on FCNC four-fermion operators are competitive with Drell-Yan production of dileptons, and improve on those for tau final states. For left-handed |∆s| = |∆d| = 1 and right-handed |∆c| = |∆u| = 1 transitions these are the best available limits, also considering rare kaon and charm decays. We estimate improvements for the 3000 fb−1 High Luminosity Large Hadron Collider.

Searching for new physics in c→u transitions with nonuniversal Z′ model

In recent years, it has been reported that rare charm decays have immense potential to probe physics beyond the standard model (SM). The Glashow–Iliopoulos–Maiani mechanism effectively suppresses the flavor changing neutral currents decays involving [Formula: see text] transitions which makes them sensitive to new physics (NP) effects. In this work, we study D meson decays undergoing [Formula: see text] transitions in nonuniversal [Formula: see text] model. We determine the NP coupling from [Formula: see text] mixing and [Formula: see text] process. We then estimate the upper limits of branching fractions and forward–backward asymmetries for the decays [Formula: see text], [Formula: see text] and [Formula: see text]. The upper limits of the branching fractions obtained in the [Formula: see text] model show a significant enhancement from their SM results.

Hint of a new scalar interaction in LHCb data?

We explain recent LHCb measurements of the lepton universality ratios, RD(∗)τ/ℓ≡B(B¯→D(∗)+τ-ν¯τ)B(B¯→D(∗)+ℓ-ν¯ℓ)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$R_{D^{(*)}}^{\ au /\\ell }\\equiv \\frac{\\mathcal {B}(\\bar{B} \\rightarrow D^{(*)+} \ au ^- \\bar{\ u }_\ au )}{\\mathcal {B}(\\bar{B} \\rightarrow D^{(*)+}\\ell ^- \\bar{\ u }_\\ell )}$$\\end{document} and R(Λc+)τ/ℓ≡B(Λb→Λc+τ-ν¯τ)B(Λb→Λc+ℓ-ν¯ℓ)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${R(\\Lambda _c^+)}^{\ au /\\ell } \\equiv \\frac{\\mathcal {B}(\\Lambda _b \\rightarrow \\Lambda _c^+ \ au ^- \\bar{\ u }_{\ au })}{\\mathcal {B}(\\Lambda _b \\rightarrow \\Lambda _c^+ \\ell ^- \\bar{\ u }_{\\ell })}$$\\end{document} with ℓ=μ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\ell =\\mu $$\\end{document}, via new physics that affects RDτ/ℓ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$R_D^{\ au /\\ell }$$\\end{document} and R(Λc+)τ/ℓ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$R(\\Lambda _c^+)^{\ au /\\ell }$$\\end{document} but not RD∗τ/ℓ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$R_{D^*}^{\ au /\\ell }$$\\end{document}. The scalar operator in the effective theory for new physics is indicated. We find that the forward-backward asymmetry and τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ au $$\\end{document} polarization in B¯→D+τ-ν¯τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\bar{B} \\rightarrow D^+ \ au ^{-} \\bar{\ u }_{\ au }$$\\end{document} and Λb→Λc+τ-ν¯τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\Lambda _b \\rightarrow \\Lambda _c^+ \ au ^- \\bar{\ u }_{\ au }$$\\end{document} decays are significantly affected by the scalar interaction. We construct a simple two Higgs doublet model as a realization of our scenario and consider lepton universality in semileptonic charm and top decays, radiative B decay, B-mixing, and Z→bb¯\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$Z \\rightarrow b \\bar{b}$$\\end{document}.

Search for baryon and lepton number violating decays D→pℓ

We search for the baryon and lepton number violating charm decays, D→pℓ, where D is either a D0 or a D¯0 and ℓ is a muon or an electron, using a data sample of 921 fb−1 collected by the Belle detector at the KEKB asymmetric energy e+e− collider. In the absence of significant signals, we set upper limits on the branching fractions in the range (5–8)×10−7 at a 90% confidence level, depending on the decay mode. Published by the American Physical Society 2024

Probing hyperon CP violation with charmed baryon decays

CP violation (CPV) in the baryon sectors has not yet been established experimentally. In this work, we propose to search for the hyperon CPV through the Cabibbo-favored charm-baryon decaying processes involving a hyperon in the final states, such as Λc+→Λ0π+ with Λ0→pπ−. The CPV of the hyperon decays is accessed exclusively in these chain processes, since the CPV in the Cabibbo-favored charm decays is vanishing in the Standard Model (SM). The hyperons are polarized in the weak charm decays, so that we can measure the Lee-Yang asymmetric parameter α by analyzing the angular distributions, and then measure the α-induced CPV. We expect that it is accessible for Belle II and LHCb to reach the SM prediction of the hyperon CPV in the near future.

A U-spin anomaly in charm CP violation

Recent LHCb data shows that the direct CP asymmetries of the decay modes D0 → π+π− and D0 → K+K− have the same sign, violating an improved U-spin limit sum rule in an unexpected way at 2.1σ. From the new data, we determine for the first time the imaginary part of the CKM-subleading, U-spin breaking ∆U = 1 correction to the U-spin limit ∆U = 0 amplitude. The imaginary part of the ∆U = 0 amplitude is determined by Delta {a}_{textrm{CP}}^{textrm{dir}} . The corresponding strong phases are yet unknown and could be extracted in the future from time-dependent measurements. Assuming mathcal{O}(1) strong phases due to non-perturbative rescattering, we find the ratio of U-spin breaking to U-spin limit contributions to the CKM-subleading amplitudes to be left({173}_{hbox{--} 74}^{+85}right)% . This highly exceeds the Standard Model (SM) expectation of ~ 30% U -spin breaking, with a significance of 1.95σ. If this puzzle is confirmed with more data in the future, in the SM it would imply the breakdown of the U -spin expansion in CKM-subleading amplitudes of charm decays. The other solution are new physics models that generate an additional ∆U = 1 operator, leaving the U-spin power expansion intact. Examples for the latter option are an extended scalar sector or flavorful Z′ models.

Search for [formula omitted] violation and measurement of branching fractions and decay asymmetry parameters for [formula omitted] and [formula omitted] ([formula omitted

We report a study of Λc+→Λh+ and Λc+→Σ0h+ (h=K,π) decays based on a data sample of 980fb-1 collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. The first results of direct CP asymmetry in two-body singly Cabibbo-suppressed (SCS) decays of charmed baryons are measured, ACPdir(Λc+→ΛK+)=+0.021±0.026±0.001 and ACPdir(Λc+→Σ0K+)=+0.025±0.054±0.004. We also make the most precise measurement of the decay asymmetry parameters (α) for the four modes of interest and search for CP violation via the α-induced CP asymmetry (ACPα). We measure ACPα(Λc+→ΛK+)=-0.023±0.086±0.071 and ACPα(Λc+→Σ0K+)=+0.08±0.35±0.14, which are the first ACPα results for SCS decays of charmed baryons. We search for Λ-hyperon CP violation in Λc+→(Λ,Σ0)π+ and find ACPα(Λ→pπ-)=+0.013±0.007±0.011. This is the first time that hyperon CP violation has been measured via Cabibbo-favored charm decays. No evidence of baryon CP violation is found. We also obtain the most precise branching fractions for two SCS Λc+ decays, B(Λc+→ΛK+)=(6.57±0.17±0.11±0.35)×10-4 and B(Λc+→Σ0K+)=(3.58±0.19±0.06±0.19)×10-4. The first uncertainties are statistical and the second systematic, while the third uncertainties come from the uncertainties on the world average branching fractions of Λc+→(Λ,Σ0)π+.

Measurement of the branching fractions for Cabibbo-suppressed decays D+→K+K−π+π0 and D(s)+→K+π−π+π0 at Belle

We present measurements of the branching fractions for the singly Cabibbo-suppressed decays D+→K+K−π+π0 and Ds+→K+π−π+π0, and the doubly Cabibbo-suppressed decay D+→K+π−π+π0, based on 980 fb−1 of data recorded by the Belle experiment at the KEKB e+e− collider. We measure these modes relative to the Cabibbo-favored modes D+→K−π+π+π0 and Ds+→K+K−π+π0. Our results for the ratios of branching fractions are B(D+→K+K−π+π0)/B(D+→K−π+π+π0)=(11.32±0.13±0.26)%, B(D+→K+π−π+π0)/B(D+→K−π+π+π0)=(1.68±0.11±0.03)%, and B(Ds+→K+π−π+π0)/B(Ds+→K+K−π+π0)=(17.13±0.62±0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83±0.42)×tan4θC, where θC is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for B(D+→K−π+π+π0) and B(Ds+→K+K−π+π0) yields B(D+→K+K−π+π0)=(7.08±0.08±0.16±0.20)×10−3, B(D+→K+π−π+π0)=(1.05±0.07±0.02±0.03)×10−3, and B(Ds+→K+π−π+π0)=(9.44±0.34±0.28±0.32)×10−3, where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction.Received 3 May 2022Accepted 28 September 2022DOI:https://doi.org/10.1103/PhysRevD.107.033003Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectroweak interactionPhysical SystemsCharmed mesonsTechniquesParticle decaysParticles & Fields

Hidden charm decays of X(4014) in a D*D¯* molecule scenario

Inspired by the recent observation of a new structure, $X(4014)$, in the process $\gamma\gamma\to \gamma\psi(2S)$, we evaluate the possibility of assigning $X(4014)$ as a $D^\ast \bar{D}^\ast$ molecular state with $I(J^{PC})=0(0^{++})$ by investigating the hidden charm decays of $X(4014)$. The partial widths of $J/\psi\omega$, $ \eta_{c}\eta$ and $\eta_{c}\eta^{\prime}$ channels are evaluated to be about $(0.41\sim 5.00)$, $(2.05\sim7.49)$ and $(0.11\sim0.51)\ \mathrm{MeV}$, respectively. Considering the experimental observation and the present estimations, we proposed to search $X(4014)$ in the $\gamma \gamma \to J/\psi \omega$ process in Belle II.

Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at [formula omitted] = 5.02 TeV at LHC

We present an analysis on the heavy flavor hadron decay electrons with charm and beauty contributions decomposed via a data driven method in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC. The transverse momentum pT spectra, nuclear modification factor RAA and azimuthal anisotropic flow v2 distributions of electrons from charm and beauty decays are obtained. We find that the electron RAA from charm (RAAc→e) and beauty (RAAb→e) decays are suppressed at pT>2.0 GeV/c in Pb+Pb collisions, which indicates that charm and beauty interact with and lose their energy in the hot-dense medium. A less suppression of RAAb→e than RAAc→e at 2.0<pT<8.0 GeV/c is observed, which is consistent with the mass-dependent partonic energy loss scenario. A non-zero electron v2 from beauty decays (v2b→e) is observed and in good agreement with ALICE measurement. At low pT from 1.0 to 3.0 GeV/c, a discrepancy between RHIC and LHC results is observed with an 85% confidence level, which might be a possible hint of an energy-dependent behavior of beauty quarks reacting with the medium created in heavy-ion collisions. At 3.0<pT<7.0 GeV/c, v2b→e deviates from a number-of-constituent-quark (NCQ) scaling hypothesis, which favors that beauty quark is unlikely thermalized in heavy-ion collisions at LHC energy.

Mixing and CP violation in charm decays at LHCb

We present an overview of four recent measurements of charm decays performed at the LHCb experiment. These include the first observation of the non-zero mass difference between neutral charm-meson eigenstates, the most precise measurements of ∆YKK and ∆Yππ, and timeintegrated ACP of eight two-body charm decays. The precision of the measurements is mainly limited by statistical uncertainty, so further improvement is expected with the upcoming LHC Run 3.

Tasting flavoured Majorana dark matter

We study a simplified model of flavoured Majorana dark matter in the Dark Minimal Flavour Violation framework. The model extends the Standard Model by a dark matter flavour triplet and a scalar mediator, through which the new dark fermions couple to right-handed up-type quarks. This interaction is governed by a new coupling matrix λ which is assumed to constitute the only new source of flavour and CP violation. We analyse the parameter space of this model by using constraints from collider searches, D0− overline{D} 0 mixing, cosmology and direct dark matter searches. Throughout our study, we point out crucial differences between the Majorana and Dirac dark matter cases. After performing a combined analysis within the context of all the experimental constraints mentioned above, we analyse which flavour for the dark matter particle is preferred by experimental data. We further investigate if this model is capable of explaining the large measured value of the direct CP asymmetry Delta {A}_{mathrm{CP}}^{mathrm{dir}} in charm decays. We find that significant enhancements with respect to the Standard Model expectation are compatible with all constraints, and even the central value of the measurement can be reached. We also advertise the flavour-violating final state with two same-sign top quarks produced in association with missing transverse energy as a smoking-gun signature for flavoured Majorana dark matter at the LHC.

Search for the decay D0→π0νν¯

We present the first experimental search for the rare charm decay $D^{0} \to \pi^{0} \nu \bar{\nu}$. It is based on an $e^+e^-$ collision sample consisting of $10.6\times10^{6}$ pairs of $D^0\bar{D}^0$ mesons collected by the BESIII detector at $\sqrt{s}$=3.773 GeV, corresponding to an integrated luminosity of 2.93~fb$^{-1}$. A data-driven method is used to ensure the reliability of the background modeling. No significant $D^{0} \to \pi^{0} \nu \bar{\nu}$ signal is observed in data and an upper limit of the branching fraction is set to be $2.1\times 10^{-4}$ at the 90$\%$ confidence level. This is the first experimental constraint on charmed-hadron decays into dineutrino final states.

Measurement of the nuclear modification factor for muons from charm and bottom hadrons in Pb+Pb collisions at 5.02 TeV with the ATLAS detector

Heavy-flavour hadron production provides information about the transport properties and microscopic structure of the quark–gluon plasma created in ultra-relativistic heavy-ion collisions. A measurement of the muons from semileptonic decays of charm and bottom hadrons produced in Pb+Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeV with the ATLAS detector at the Large Hadron Collider is presented. The Pb+Pb data were collected in 2015 and 2018 with sampled integrated luminosities of 208μb−1 and 38μb−1, respectively, and pp data with a sampled integrated luminosity of 1.17pb−1 were collected in 2017. Muons from heavy-flavour semileptonic decays are separated from the light-flavour hadronic background using the momentum imbalance between the inner detector and muon spectrometer measurements, and muons originating from charm and bottom decays are further separated via the muon track's transverse impact parameter. Differential yields in Pb+Pb collisions and differential cross sections in pp collisions for such muons are measured as a function of muon transverse momentum from 4 GeV to 30 GeV in the absolute pseudorapidity interval |η|<2. Nuclear modification factors for charm and bottom muons are presented as a function of muon transverse momentum in intervals of Pb+Pb collision centrality. The bottom muon results are the most precise measurement of b quark nuclear modification at low transverse momentum where reconstruction of B hadrons is challenging. The measured nuclear modification factors quantify a significant suppression of the yields of muons from decays of charm and bottom hadrons, with stronger effects for muons from charm hadron decays.

Study of heavy-flavor decay muon production in proton–proton and heavy-ion collisions using the Angantyr model at LHC energies

We study the production of heavy-flavor decay muons (HFM) in proton–proton ([Formula: see text]–[Formula: see text]) and heavy-ion ([Formula: see text]–[Formula: see text]) collisions using Angantyr model in PYTHIA8 at Large Hadron Collider (LHC) energies. These studies have been performed for three colliding systems: small ([Formula: see text]–[Formula: see text]), intermediate (Xe–Xe) and large (Pb–Pb). The works have been performed in [Formula: see text]–[Formula: see text] (with [Formula: see text] = 2.76, 5.02, 7.0 and 13[Formula: see text]TeV), Xe–Xe (with [Formula: see text][Formula: see text]=[Formula: see text]5.44[Formula: see text]TeV) and Pb–Pb (with [Formula: see text][Formula: see text]=[Formula: see text]2.76 and 5.02[Formula: see text]TeV) collision systems. The production of heavy-flavor (charm and bottom quarks) decay muons in [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text] collisions is measured in the forward rapidity [Formula: see text]. The standard statistical uncertainty is computed for each case as [Formula: see text]. In the study of [Formula: see text]-distribution of HFM at forward rapidity ([Formula: see text]) using Angantyr model, we find that simulation results agree with ALICE data reasonably well for [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text] collisions. The comparison of simulation results with ALICE data for [Formula: see text]-distribution at [Formula: see text] and 7.0[Formula: see text]TeV in [Formula: see text]–[Formula: see text] collision has also been illustrated. In addition to the particle spectra, a more quantitative model-to-data comparison can be obtained through the observable [Formula: see text]. We, thus, calculate [Formula: see text] of HFM in this work for [Formula: see text] and 5.02[Formula: see text]TeV. The simulated [Formula: see text] results overestimate the ALICE data. [Formula: see text] estimation as a function of [Formula: see text] shows almost constant values and close to unity at lower energy ([Formula: see text][Formula: see text]=[Formula: see text]2.76[Formula: see text]TeV), but substantially lower than unity at comparatively higher energy ([Formula: see text][Formula: see text]=[Formula: see text]5.02[Formula: see text]TeV). We also predict for the HFM [Formula: see text] spectrum and [Formula: see text]-distribution in O–O collision at [Formula: see text][Formula: see text]=[Formula: see text]6.37[Formula: see text]TeV for 0–10[Formula: see text] collision centrality. These simulated spectra are illustrated for ALICE Run3 experiment and they comply with other HFM ALICE measurements.

Measurements of electrons from heavy-flavor hadron decays in 27, 54.4, and 200 GeV Au+Au collisions in STAR

In these proceedings, we present the measurements of nuclear modification factors for electrons from open charm (c→e) and bottom hadron decays (b→e) at mid-rapidity region in Au+Au collisions at √SNN = 200 GeV. The significance of the difference in nuclear modification factors between b→e and c→e is ≥ 3σ. We also present the measurements of the elliptic flow (v2) of inclusive heavy-flavor hadron decayed electrons (HFE) in Au+Au collisions at √SNN = 27 and 54.4 GeV. The results show non-zero HFE v2 in 54.4 GeV Au+Au collisions and a hint of smaller HFE v2 in 27 GeV Au+Au collisions than those at 54.4 and 200 GeV.

Holographic charm and bottom pentaquarks. II. Open and hidden decay widths

We analyze the decay modes of the three $[\frac 12\frac 12^-]_{S=0,1}$ and $[\frac 12\frac 32^-]_{S=1}$ non-strange pentaquarks with hidden charm and bottom, predicted by holographic QCD in the heavy quark limit. In leading order, the pentaquarks %are composed of heavy-light mesons in bulk bound to an instanton core. They are degenerate and stable by heavy quark symmetry. At next to leading order, the spin interactions lift the degeneracy and cause the pentaquarks to decay. We show that the open charm (bottom) decay modes dwarf the hidden charm (bottom) ones, with total widths that are consistent with those recently reported by LHCb for charm pentaquarks. Predictions for bottom pentaquarks are given.

DIGITAL GENERATORS OF A PSEUDORANDOM PULSES SEQUENCE AND THEIR MODELING WITH USE OF FPGA INTHE ENVIRONMENT CAD QUARTUS II

From the results obtained in publication [1] as well percentage between decay modes of exitated states of mesons, cited in reference book “Particle Data Group” became possible to evaluate the number of hadron final states on which the meson with hidden charm decay. In the paper is shown a rough estimate of final states number for hadron decays of mesons with hidden charm. The most statistically secured are the final states for ηс (1 S), 2 (π+π-) and π+π- K+K- for χс0 (1P) mesons.