Conveners
Parallels Track C: Monday I
- Joan Soto (Universitat de Barcelona)
Parallels Track C: Monday II
- Roberto Mussa (INFN Torino)
Parallels Track C: Tuesday I
- Hee Sok Chung (Technical University of Munich)
Parallels Track C: Tuesday II
- Roberto Mussa (INFN Torino)
Parallels Track C: Thursday I
- Joan Soto (Universitat de Barcelona)
Parallels Track C: Thursday II
- Hee Sok Chung (Technical University of Munich)
Parallels Track C: Friday I
- Antonio Vairo
Parallels Track C: Friday II
- Antonio Vairo
Most of the exotic quarkonium states have been observed in transitions to standard quarkonium states plus light-quark hadrons. However, so far very little is known of these transitions widths in the Born-Oppenheimer picture of exotic quarkonium, that is when exotic quarkonium are considered as heavy-quark-antiquark bound states over the spectrum of static energies for any given set of light...
In order to understand the nature of the XYZ particles, theoretical predictions of the various XYZ decay modes are essential. In this work, we focus on the decays of the heavy quarkonium hybrids in the EFT framework. We start with the weakly coupled potential NRQCD effective theory that describes systems with two heavy quarks and incorporates multipole expansions and use it to develop a...
The diabatic approach in QCD [1-3] allows to describe a quarkoniumlike meson in terms of heavy quark-antiquark and open-flavor meson-meson pairs, interacting through a coupled-channel potential inferred from lattice calculations of string breaking [4]. In this talk, we present a systematic analysis of $J^{PC}=1^{++}$ charmoniumlike mesons with energies up to $4.0$ GeV within the diabatic...
The Belle experiment at the KEKB energy-asymmetric e+-e- collider
accumulated dataset with integrated luminosity of 1/ab, including
Upsilon(nS) on resonances, off-resonances, and Upsilon(5S) scan data. And
the Belle II experiment is a substantial upgrade of the B factory facility,
with much higher instantaneous luminosity and will accumulate 50/ab of
data. Belle II has already accumulated...
We report our analysis for the static energy in (2+1+1)-flavor QCD over a wide range of lattice spacings and several quark masses, including the physical quark mass with ensembles of lattice-gauge-field configurations made available by the MILC Collaboration. We obtain results for the static energy out to distances of nearly 1fm, allowing us to perform a simultaneous determination of the...
The existence of the X(3872) resonance extremely close to the D∗0 D0-bar threshold implies that neutral charm mesons have an approximate nonrelativistic conformal symmetry. Systems consisting of these mesons with small kinetic energies produced in a short-distance reaction are unparticles that can be created by an operator with definite scaling dimensions in a nonrelativistic conformal field...
In recent years, the BESII and BESIII collaborations have provided a lot of new and accurate data on baryon decays of S-wave charmonium states.
These data indicate about sizable effects associated with power corrections to the well known leading-order approximation.
In my talk I will discuss a description of $J/psi\to B\bar B$ decays within the effective field theory framework (NRQCD &...
The peak region in heavy quark production is best described in boosted heavy quark effective theory, where its mass is integrated out. Within this approach the cross section can be factorized into hard, jet and soft func- tions, and large logs associated with the mass can be summed up to all orders.
In this talk we present the computation of the missing pieces to get the bHQET thrust and...
Heavy quarkonium production of high transverse momentum ($p_T$) in hadronic collisions can be pursued in the QCD factorization formalism with heavy quarkonium fragmentation functions (FFs). The scale evolution of quarkonium FFs enables us to resum logarithmically enhanced corrections $\alpha_s\ln(p_T^2/m^2)$ with heavy quark mass $m$, which is an essential piece to explore the nonperturbative...
We review the status of tensions in the flavour sector, with particular
attention to semileptonic BBB decays and ∣Vxb∣|V_{xb}|∣Vxb∣
determinations.
In the context of lepton flavor universality violation (LFUV) studies, we study different observables related to the $b\to c\tau \bar{\nu}_\tau$ semileptonic decays. These observables are expected to help in distinguishing between different NP scenarios. Since the $\tau$ lepton is very short-lived, we consider three subsequent $\tau$-decay modes, two hadronic $\pi\nu_\tau$ and $\rho\nu_\tau$...
Charged mesons in the charmonium mass region are a clear indication of the existence of states beyond the naive quark model. After the discovery of the Zc(3900) and Zc(4020) by the BESIII and Belle Collaborations, the Zcs(3985) was discovered by the BESIII Collaboration in the K+ recoil mass spectrum in e+e- collisions.
A natural explanation of the Zc states in the quark model can be...
Stunning discoveries of the hadronic states that are manifestly different to the conventional meson and baryons have energized the field of spectroscopy in recent years. New exotic states keep appearing thanks to the excellent detector performance of the LHCb experiment and scrupulous data analysis. In this talk, fresh findings on the heavy-flavour pentaquarks and tetraquark families at LHCb...
In the 1960’s Weinberg proposed a way to discriminate between molecular and compact near-threshold bound states in the weak-binding limit. We discuss a generalisation of this criterion which can be employed to characterise the compositeness of bound, virtual and resonance states [1]. In addition, the relevant modifications in the presence of coupled channels, isospin violations and...
The double-charm tetraquark meson $T_{cc}^+(3875)$ can be produced in high-energy proton-proton collisions by the creation of the charm mesons $D^{*+} D^0$ at short distances followed by their binding into $T_{cc}^+$. The $T_{cc}^+$ can also be produced by the creation of $D^{*+} D^{*+}$ at short distances followed by their rescattering into $T_{cc}^+ \pi^+$. A charm-meson triangle...
We compute the QCD static force and potential using gradient flow at next-
to-leading order in the strong coupling. The static force is the spatial derivative of the
static potential: it encodes the QCD interaction at both short and long distances. While
on the one side the static force has the advantage of being free of the O(ΛQCD) renormalon
affecting the static potential when computed...
In this talk, I discuss our recent determination of nonperturbative matrix elements of heavy quark effective theory (HQET), $\bar{\Lambda}$ and $\mu_{\pi}^2$, which universally parametrize nonperturbative effects on various observables in heavy-light meson systems. In this determination, B meson masses and D meson masses are used as inputs. Using our renormalon subtraction method based on...
I will discuss the prospects of using femtoscopy in high-energy proton-proton and heavy-ion collisions to learn about the low-energy J/psi-nucleon interaction. Femtoscopy is a technique that makes it possible to obtain spatio-temporal information on particle production sources at the femtometer scale through measurements of two-hadron momentum correlation functions. These correlation functions...
We present a calculation of the heavy quark transport coefficients in a quark-gluon plasma under the presence of a strong external magnetic field, within the Lowest Landau Level (LLL) approximation. In particular, we apply the Hard Thermal Loop (HTL) technique for the resummed effective gluon propagator, generalized for a hot and magnetized medium. Using the derived effective HTL gluon...
We present results on the in-medium interactions of static quark anti-quark pairs using realistic 2+1 HISQ flavor lattice QCD. Focus is put on the extraction of spectral information from Wilson line correlators in Coulomb gauge using four complementary methods. Our results indicate that on HISQ lattices, the position of the dominant spectral peak associated with the real-part of the interquark...
We present work [1], in which we extend the publicly available quantumfdtd code. It was originally intended for solving the time-independent three-dimensional Schrödinger equation via finite-difference time-domain (fdtd) method and extracting the ground, first and second excited states. We extend it to (a) include the case of the relativistic Schrödinger equation and (b) add two optimized...
We generalize a complex heavy-quark potential model from an isotropic QCD plasma to an anisotropic one by replacing the Debye mass $m_D$ with an anisotropic screening mass depending on the quark pair alignment with respect to the direction of anisotropy.
Such an angle-dependent mass is determined by matching the perturbative contributions in the potential model to the exact result obtained in...
