# 10th International Workshop on Charm Physics (CHARM 2020)

18-22 May 2020
Mexico/General timezone
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## Contribution List

Displaying 22 contributions out of 22
We present in full analytic form the partial widths for the lepton flavour violating decays $L^\pm \to \ell^\pm \ell'^{+} \ell'^{-}$, with $L = \tau, \mu$ and $\ell(') = \mu, e$, mediated by neutrino oscillations in the one-loop diagrams. Compared to the first result by Petcov:1976ff, which was obtained in the nonphysical zero momentum limit $\mathcal{P} \ll m_{\nu} \ll M_W$, we retain full d ... More
Presented by Patrick BLACKSTONE
Maximally precise calibration of the CMS luminosity measurement is critical for many physics measurements. To guarantee high quality absolute calibration, a complete van der Meer scan program was carried out at the CMS experiment in 2018. The systematic uncertainty on the absolute calibration from the van der Meer scans is derived with a precision of 2.1%. The performance and stability of the CMS ... More
Presented by Mr. Ashish SEHRAWAT, Dr. José Feliciano BENITEZ RUBIO
The physics of CPV and oscillations in the charn sector is reviewed. Topics like the recent discover of direct CPV, the latest measurements, the respective SM predictions and the present absence of new physics in this sector.
Presented by Carlos RAMIREZ
Charm sector provides an unique environment for the searches of Physics Beyond the Standard Model. Recent observation of CP violation in the $D^0$ decays by the LHCb collaboration has renewed this interest and calls for confirmation in other channels and by other experiments. Belle II will play crucial role in measuring CP violation in many decay channels, especially those having neutral particles ... More
Presented by Prof. Ida PERUZZI
In this contribution, we discuss the internal structure of heavy baryons and the different interpretations of the internal structure of hidden-charm pentaquarks. We present the hidden-charm pentaquarks as superpositions of meson-baryon channels coupled to a $uudc\bar{c}$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can reproduce the masses a ... More
Presented by Dr. Hugo GARCIA TECOCOATZI
The Belle II experiment has successfully started its data taking in 2018. By 2026 it is expected to collect 50 inverse ab integrated luminosity; this data set will allow important confirmations and detailed studies of previously discovered states, and search for new resonances. The data collected by Belle II with the first 10/fb delivered luminosity have been used for feasibility studies, for exa ... More
Presented by Prof. Ida PERUZZI
We investigate photo-production of vector mesons J/Psi and Upsilon measured both at HERA and LHC. We are interested in using this observable to distinguish between linear and non-linear QCD evolution at low x. The employed fits are based on non-linear Balitsky-Kovchegov evolution (Kutak-Sapeta gluon; KS) and next-to-leading order Balitsky-Fadin-Kuraev-Lipatov evolution (Hentschinski-Sabio Vera-Sal ... More
Presented by Dr. Martin HENTSCHINSKI
We study the spectroscopy and transport properties of charmed mesons in a thermal medium by applying an effective field theory based on chiral and heavy-quark symmetries in the imaginary time formalism. Relying on unitarity constraints and self-consistency we extract the in-medium properties (masses and widths) of D and Ds mesons and their interactions with light hadrons. We report our findings on ... More
Presented by Juan TORRES-RINCON
BESIII has collected data samples corresponding to luminosities of 2.93 fb-1 and 3.19 fb-1 at center-of-mass energies of 3.773 and 4.178 GeV, respectively. The data set collected at 3.773 GeV contains quantum-correlated D0D0bar pairs that allow to access the phase differences between amplitudes. We report the measurements of strong phase differences in D0(-bar) decays, especially for K_S/Lpi+pi- ... More
Presented by Jingzhi ZHANG
Track: Charm meson and baryon spectroscopy (including exotica)
We study the nature of the new signal reported by LHCb in the $J/\psi p$ spectrum. Based on the S-matrix principles, we perform a minimum-bias analysis of the underlying reaction amplitude, focusing on the analytic properties that can be related to the microscopic origin of the Pc(4312)+ peak. By exploring several amplitude parameterizations, we find evidence for the attractive effect of the $Σ_c ... More Presented by Mr. Jorge Antonio SILVA CASTRO In LEP times, hadronic tau decays were the most precise input for the (leading-order) hadronic vacuum polarization piece (HVP,LO) of the muon anomalous magnetic moment ($a_\mu$). With the advent of$\Phi$- and B-factories,$e^+e^-$hadronic cross-section surpassed them, giving the most accurate input for this piece. However, since both data-driven determinations are subject to theoretical uncertai ... More Presented by Mr. Jesús MIRANDA The experimental information accumulated by the BABAR, Belle and LHCb experiments have shown disagreement on the measurements of the ratios$R(D)$and$R(D^{*})$, compared with the SM predictions. In addition, the$D^\ast$longitudinal polarization$F_L(D^\ast)$related with the channel$B \to D^\ast \tau \bar{\nu}_\tau$observed by the Belle Collaboration and the ratio$R(J/\psi)$measured by the ... More Presented by Dr. Nestor QUINTERO POVEDA psi(2S) provides good opportunities for the study of chi_cJ, eta_c, and h_c decays. These studies can be used to verify QCD based models, which provide predictions for the decay mechanism. With the world's largest sample of 4.48*10^8, progress on the charmonium decays has been made. In the talk, we report the new results, such as the first measurement of the branching ratio of chi_c1,2 to mu+ mu- ... More Presented by Jingzhi ZHANG In this talk we present the latest results on radiative and rare/forbidden decays for D and D_s mesons from the BESIII experiment based on 2.92 fb$^{-ˆ’1}$and 3.19 fb$^{-1}$data samples taken at the center-of-mass energies 3.773 and 4.178 GeV, respectively. With the 4.178 GeV data, searches for the rare decay$D^+_S\to p\bar{p}e^+\nu_e$and rare radiative leptonic decay$D_S^+\to\gamma e^+\nu ... More
Presented by Jingzhi ZHANG
BESIII has collected data samples corresponding to luminosities of 2.93 fb-1 and 3.19 fb-1 at center-of-mass energies of 3.773 and 4.178, respectively. We report recent measurements that include the decays D(s)+ -> l+v (l=mu, tau), D0(+) -> K-bar(pi)l+v (l=e,mu), D0(+) -> a0(980)e+v, D+->K1(1270)e+nu, D(s)+ -> eta(')e+nu, Ds+ -> K(*0)enu, Ds+ -> phi enu,. The first searches for Ds+ -> gamma e+nu a ... More
Presented by Jingzhi ZHANG
We study the expected sensitivity at Belle and Belle II for four-body τ∓→X±l∓l∓ντ decays where l=e or μ and X=π, K, ρ and K∗ mesons. These decay processes violate the total lepton number (|ΔL|=2 ) and they can be induced by the exchange of Majorana neutrinos. In particular, we consider lifetimes in the accessible ranges of τN = 5, 100 ps and extract the limits on |VℓN|2 withou ... More
Presented by Dr. Pedro PODESTA
The BES III detector at Beijing Electron-Positron Collider has collected the world’s largest data sets. In this talk I will report recent results on the baryon pair production in Charmonium(-like) and in the e+e− annihilation at BESIII.
Presented by Dr. Xiongfei WANG
The Belle II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider. The design luminosity of the machine is 8 × 1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run and main operati ... More
Presented by Prof. Ida PERUZZI
The $D_s$ semileptonic decays provides an ideal scenario in the charm sector to search for Lepton number violation (LNV), Lepton flavor universality (LFU) tests and new contributions in Flavor changing neutral currents (FCNC) modes. In this work, we first describe the long distance (LD) contributions in the $D_{s} \rightarrow \pi l^{+} l^{-}$ decay, a non-FCNC mode usually employed as normalizati ... More
Presented by Mr. Marxil SÁNCHEZ
In a recent paper [1], the BESIII collaboration reported the so-called first observation of pure $W$-annihilation decays $D^+_s \to a^+_0(980) \pi^0$ and $D_s^+ \to a^0_0(980)\pi^+$. The measured absolute branching fractions are, however, puzzlingly larger than those of other measured pure $W$-annihilation decays by at least one order of magnitude. In addition, the relative phase between the two d ... More
Presented by Dr. Raquel MOLINA PERALTA
The recent LHCb discovery of three pentaquark states may usher in a new ear in our understanding of the low energy strong interaction. These states might be part of a first complete multiplet composed of seven hadrons of molecular nature. At least this is what emerges from a leading order effective field theory using only data and heavy quark spin symmetry as constrains [1]. In addition, we will s ... More
Presented by Prof. Lisheng GENG
From 2011, BESIII has taken about 20 fb^-1 data samples at center of mass energies from 3.8 to 4.6 GeV, containing 21 energy points with luminosity larger than 400 pb^-1. This makes the study of vector states Y, charged states Z, X states, as well as the connections between them through transition processes possible. Using these data samples, new information about X(3872) decays, Y states from ope ... More
Presented by Jingzhi ZHANG