XIIth Quark Confinement and the Hadron Spectrum

Session

Section C

3

29 Aug 2016, 15:00

Alexandros I (Makedonia Palace)

Conveners

Section C

• Antonio Vairo (TUM )

Section C

• Antonio Vairo (TUM)

Section C

• Joan Soto (Universitat de Barcelona)

Section C

• Pavel Pakhlov (Lebedev's Physical Institute)

Section C

• Pavel Pakhlov (Lebedev's Physical Institute)

Section C

• Pavel Pakhlov (Lebedev's Physical Institute)

Section C

• Antonio Vairo (TUM)

Section C

• Joan Soto (Universitat de Barcelona)

Description

Section C: Heavy Quarks
Heavy-light mesons, heavy quarkonia, heavy baryons, heavy exotics and related topics: phenomenology of spectra, decays, and production; effective theories for heavy quarks (HQET, NRQCD, pNRQCD, vNRQCD, SCET); sum rules for heavy hadrons; lattice calculations of heavy hadrons; heavy-quark masses determination; experiments.
Conveners: G. Bodwin (Argonne NL), P. Pakhlov (ITEP, Moscow), J. Soto (U. Barcelona), A. Vairo (TU Munich)

125. Open-charm production measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

Elisa Meninno (Universita e INFN, Salerno (IT))

29/08/2016, 15:00

Section C: Heavy Quarks

Heavy quarks (charm and beauty) are interesting probes to study the Quark-Gluon Plasma (QGP) in high-energy heavy-ion collisions, since they are produced in initial hard partonic scattering processes on a short time scale and experience the whole evolution of the medium. They are expected to traverse the QCD medium, interacting with its constituents and losing energy through radiative and...

99. Open charm meson and baryon spectroscopy from lattice QCD

Gunnar Bali (Universität Regensburg)

29/08/2016, 15:20

Section C: Heavy Quarks

We present results of simulations of the RQCD Collaboration on open charm states, including a scattering analysis of scalar and axialvector $D_s$ mesons near the physical pion mass, utilizing different spatial volumes. The spectra are obtained, using $N_f=2$ QCDSF and RQCD as well as $N_f=2+1$ CLS ensembles, employing non-perturbatively improved Wilson fermions. In the latter case,...

149. Rare $B$ meson decays on the lattice

Andria Agadjanov

29/08/2016, 15:40

Section C: Heavy Quarks

The extraction of the $B \to K^*$ transition form factors from lattice data at (close to) physical pion masses is discussed. The possible mixing of $\pi K$ and $\eta K$ states is taken into account. Applying non-relativistic effective field theory in a finite volume, the two-channel analogue of the Lellouch-Luscher formula is reproduced. Due to the resonance nature of the $K^*$ , it is shown...

41. Form factors and differential distributions in rare radiative leptonic B-decays

Anastasiia Kozachuk (M.V. Lomonosov Moscow State University (RU))

29/08/2016, 16:00

Section C: Heavy Quarks

We analyze long-distance QCD effects in $B_{d,s}\to\ell^+\ell^-\gamma$ decays.
Taking into account photon emission from the $b$-quark loop, weak annihilation,
and Bremsstrahlung from leptons in the final state, we give predictions
for dilepton spectrum and various asymmetries in $B_{d, s}\to \ell^+\ell^-\gamma$ decays within the Standard Model.

196. Heavy quark physics from Fermilab/MILC collaboration

Alexei Bazavov (Brookhaven National Laboratory)

29/08/2016, 16:20

Section C: Heavy Quarks

We present the results of our recent calculations of the hadronic form factors for semileptonic decays of B mesons and the matrix elements of local operators contributing to neutral B and Bs meson mixing. From joint fits of the lattice results and the experimental data we are able to determine the magnitude of the CKM matrix elements Vub and Vcb, and also (with Vtb as an additional input) the...

213. Scattering of charmed mesons from lattice QCD

Dr Graham Moir (University of Cambridge)

29/08/2016, 16:40

Section C: Heavy Quarks

We present a lattice QCD study of coupled-channel $D\pi$, $D\eta$ and $D_{s}\bar{K}$
scattering, as well single-channel $DK$ scattering. Our methodology allows us to determine precise finite volume spectra which we use to constrain scattering amplitudes as a function of energy. We interpret our results in terms of poles in the $S$-matrix and provide a measure of the coupling of each channel...

32. Isospin-breaking in the decay constants of heavy mesons from QCD sum rules

Dmitri Melikhov (HEPHY)

29/08/2016, 17:30

Section C: Heavy Quarks

We show that having at hand the analytic expression for the correlation functions allows one to study subtle effects related to isospin-breaking effects in the decay constants of heavy pseudoscalar and vector mesons. We obtain predictions for these effects in fD, fD, fB and fB mesons.

139. D and B mesons masses in chiral perturbation theory with heavy quark symmetry

Dr Mohammad Alhakami (KACST)

29/08/2016, 17:50

Section C: Heavy Quarks

The aspects of mesons containing a single heavy quark are governed by the spin symmetry $SU(2)_s$ of the heavy quark and the chiral symmetry $SU(3)_L\times SU(3)_R$ of the light quarks. Incorporating both approximate symmetries in a single framework was achieved by defining the heavy meson chiral perturbation theory (HMChPT).
The masses of D and B mesons are analysed within this effective...

268. The bottom-quark mass from non-relativistic sum rules at NNNLO

Jan Piclum (University of Siegen)

29/08/2016, 18:30

Section C: Heavy Quarks

The mass of the bottom quark can be determined with high precision from moments of the pair-production cross section $\sigma(e^+ e^- \to b \bar{b})$ near threshold. We present the first complete NNNLO determination from non-relativistic sum rules, obtaining a bottom-quark mass of $m_b^\text{PS}(2\,\text{GeV}) = 4.532^{+0.013}_{-0.039}\,\text{GeV}$ in the potential-subtracted scheme. For the...

333. Short-distance current correlators on the lattice

Shoji Hashimoto (KEK)

29/08/2016, 18:50

Section C: Heavy Quarks

Although the main use of lattice QCD computation is to provide non-perturbative calculation of low-energy physical quantities, it can also be used to calculate short-distance quantities. By matching thus calculated short-distance current correlators to corresponding perturbative calculations one can obtain the parameters appearing in the perturbation theory, such as the strong coupling...

432. Experimental highlights: Heavy Quark Physics in Heavy-Ion collisions at RHIC

Dr Rachid Nouicer (Brookhaven National Laboratory)

29/08/2016, 19:10

Section C: Heavy Quarks

Hadrons carrying heavy quarks, i.e. charm or bottom, are important probes of the hot and dense medium created in relativistic heavy-ion collisions. Heavy quark-antiquark pairs are mainly produced in initial hard scattering processes of partons. While some of the produced pairs form bound quarkonia, the vast majority hadronize into open heavy flavor particles. RHIC experiments carry out a...

36. pNRQCD determination of E1 radiative transitions

Sebastian Steinbeißer (Technische Universität München)

30/08/2016, 15:00

Section C: Heavy Quarks

Electromagnetic E1 (and M1) multipole transitions have been studied since the early days of hadron spectroscopy because they allow to access heavy quarkonium states which are below open-flavour threshold. Moreover, they are interesting by themselves because they are an important tool to check particular regions of the hadrons' wave function and thus to determine their internal structure and...

58. Recent Results on Bottomonium Studies at Belle

Dr Simon Eidelman (Budker Institute and Novosibirsk State University)

30/08/2016, 15:20

Section C: Heavy Quarks

Belle, a general-purpose detector operated at the KEKB electron-positron
B-factory at KEK, Japan, collected the world largest integrated luminosity
at the peak of the $\Upsilon(4S)$ meson as well as in a scan of the
center-of-mass energy range from 10.63 to 11.05 GeV.
We describe recent results on various bottomonium states studied -
mass and width measurements of the $\Upsilon(5S)$ and...

229. Relativistic two-body calculation of bottomonium radiative decays

Dr Emanuele Sorace (INFN- Firenze)

30/08/2016, 15:40

Section C: Heavy Quarks

Numerical recovering of the spectrum and wave function of a two-body fermionic relativistic potential system.
Estimation in this framework of the widths and branching ratios of some heavy mesons radiative decays.

205. Poincare invariance in low-energy effective field theories for QCD

Sungmin Hwang (Technical University of Munich)

30/08/2016, 16:00

Section C: Heavy Quarks

We use non-linear field transformations for non-relativistic fields to implement Poincare invariance in low energy effective theories for QCD. In these transformations we include all terms allowed by the explicit symmetries of the effective theory, but exploit the freedom to remove some of them through field redefinitions. By requiring the invariance of the Lagrangian under these...

232. Effective field theory for long-range properties of bottomonium states

Gastao Krein (UNESP)

30/08/2016, 16:20

Section C: Heavy Quarks

We derive an analytical expression for the chromopolarizability of bottomonium states using the framework of potential nonrelativistic QCD. Next, using the QCD trace anomaly we obtain the two-pion production amplitude for the chromopolarizability operator and match the result to a chiral effective field theory for bottomonium states and pions as degrees of freedom. In this chiral effective...

394. Production and decay of $\eta_c$ states at LHCb

Sebastian Neubert (Ruprecht-Karls-Universitaet Heidelberg (DE))

30/08/2016, 17:30

Section C: Heavy Quarks

The LHCb experiment is designed to study the decays and properties of heavy flavoured hadrons produced in the forward region from pp collisions at the CERN Large Hadron Collider. It has recorded the world’s largest data sample of beauty and charm hadrons, enabling precise studies into the production and decay of such particles. $\eta_c$ production has been studied in B decays and in prompt...

23. $eta_c$ production at the LHC challenges nonrelativistic-QCD factorization

Zhiguo He (Hamburg University)

30/08/2016, 17:50

Section C: Heavy Quarks

We analyze the first measurement of $\eta_c$
production, performed by the LHCb Collaboration, in
the nonrelativistic-QCD (NRQCD) factorization framework
at next-to-leading order (NLO) in the
strong-coupling constant $\alpha_s$ and the relative velocity v
of the bound quarks including the feeddown
from $h_c$ mesons. Converting the long-distance matrix elements (LDM
Es) extracted by...

267. Fragmentation contributions to J/psi photoproduction at HERA

Hee Sok Chung (CERN)

01/09/2016, 14:30

Section C: Heavy Quarks

We compute leading-power fragmentation corrections to $J/\psi$
photoproduction at DESY HERA, making use of the nonrelativistic QCD
factorization approach. Our calculations include parton production cross
sections through order $\alpha_s^3$, fragmentation functions though
order $\alpha_s^2$, and leading logarithms of the transverse momentum
divided by the charm-quark mass to all orders in...

72. Relativistic corrections to electromagnetic heavy quarkonium production

Vladyslav Shtabovenko (TUM)

01/09/2016, 14:50

Section C: Heavy Quarks

We study higher order relativistic corrections to the electromagnetic production cross-section of a heavy quarkonium and a hard photon in the factorization framework of non-relativistic QCD (NRQCD). We obtain new matching coefficients and discuss the importance of contributions from color octet operators, that were not considered in the previous studies of this process.

138. New observables in quarkonium production

Jean-Philippe Lansberg (IPN Orsay, Paris Sud U. / IN2P3-CNRS)

01/09/2016, 15:10

Section C: Heavy Quarks

References:

[1] J/Psi -pair production at large momenta: Indications for double parton scatterings and large alpha_s^5 contributions. By J.P. Lansberg, H.S. Shao. arXiv:1410.8822 [hep-ph]. Phys.Lett. B751 (2015) 479.

[2] Production of J/psi+eta(c) vs. J/psi+J/psi at the LHC: Impact of Real alpha_s^5 corrections. By J.P. Lansberg, H.-S. Shao. [arXiv:1308.0474 [hep-ph]]. Phys.Rev.Lett....

68. Approximate degeneracy of heavy-light mesons with the same $L$

Takayuki Matsuki (Tokyo Kasei University)

01/09/2016, 15:30

Section C: Heavy Quarks

In this work, we pint out that there exists an approximate degeneracy among heavy-light systems with the same $L$.
This is supported by an experimental fact which can be seen from the observed data. This approximate symmetry explains why the GI model obtains results similar to those of the heavy-light systems which are fitted well with experimental data. This is because the GI model has this...

193. pNRQCD at N^3LO: the potential for unequal masses and the Bc spectrum

Clara Peset (UAB/IFAE)

01/09/2016, 15:50

Section C: Heavy Quarks

We determine the $1/m$ and $1/m^2$ spin-independent heavy quarkonium potentials in the unequal mass case with $\mathcal O (\alpha^3)$ and $\mathcal O (\alpha^2)$ accuracy, respectively. Furthermore, we discuss in detail different methods to obtain the potential and we provide the explicit field redefinition that relates them, thus clarifying the relation between different previous partial...

97. Relativistic phenomenology of meson spectra with a covariant quark model in Minkowski space

Ms Sofia Leitão (CFTP, IST, Lisbon)

01/09/2016, 16:10

Section C: Heavy Quarks

Our formalism is based on the Covariant Spectator Theory (CST), a framework based on field theory originally developed to study systems of few nucleons. The distinctive feature of this approach is that it approximates the full Bethe-Salpeter-equation by taking into account, effectively, the contributions of both ladder and crossed ladder diagrams in the kernel.

Another notable feature of...

77. X(3872) production in heavy ion collisions

Dr Fernando Navarra (IFUSP / São Paulo - Brazil)

01/09/2016, 17:00

Section C: Heavy Quarks

This talk will be based on the e-print "X(3872) production and absorption in a hot hadron gas", arXiv:1604.07716.

154. The non-perturbative unquenched quark model

David Rodriguez Entem (University of Salamanca)

01/09/2016, 17:20

Section C: Heavy Quarks

Since the discovery of the $X(3872)$ in 2003 [1] it became evident that the naive
quark model would not be enough to describe all the baryon spectrum. This state
has properties that can not be explained in such a quark model, as its decay into
$J/\Psi \pi \pi$ through a $\rho$ meson, which is an isospin violating decay. However
this property can be easily explained in a picture in which...

166. Exotic quarkonium states in CMS

Leonardo Cristella (Università & INFN, Bari (IT))

01/09/2016, 17:40

Section C: Heavy Quarks

Using large data samples of di-muon events, CMS has performed detailed measurements and searches for new states in the field of exotic quarkonia. We report on measurements of the charmonium X(3872), and search for its counterpart in the bottomonium sector. The investigation of the B+ to J/ψ φ K+ decay reveals two structures in the J/ψ φ mass spectrum. For the one closest to the kinematical...

183. Molecular partners of the X(3872) from heavy-quark spin symmetry: a fresh look.

Vadim Baru (Ruhr University Bochum)

01/09/2016, 18:00

Section C: Heavy Quarks

The heavy-quark spin symmetry (HQSS) partners of the X(3872) molecule are investigated based on a chiral effective field theory (EFT) approach involving contact and one-pion exchange interactions. The integral equations of the Lippmann-Schwinger type are solved for a coupled-channel problem involving the $D\bar D, D\bar{D}^*$, and $D^*\bar{D}^*$ interactions to yield the scattering...

55. Traces of the hidden-charm S=-1 pentaquark in the Lambda_b --> J/psi eta Lambda decay

Volodymyr Magas (University of Barcelona)

01/09/2016, 18:20

Section C: Heavy Quarks

The hidden charm pentaquark state $P_c(4450)$, observed recently by the LHCb collaboration in the $\Lambda_b \rightarrow J/\psi K^- p$ decay, may be of molecular nature, as advocated by some unitary approaches that also predict pentaquark partners in the strangeness S=-1 sector. In this work we argue that a hidden-charm strange pentaquark could also be seen in the decay of the $\Lambda_b$,...

287. Nuclear Effects on Tetraquark Production by Double Parton Scattering

Prof. Fabiana Carvalho (UNIFESP)

01/09/2016, 18:40

Section C: Heavy Quarks

Exotic Mesons Production, All charm tetra quark, Double Parton Scattering, Color Evaporation Model.

66. Phenomenology of near-threshold states: a practical parametrisation for the line shapes

Alexey Nefediev (ITEP)

02/09/2016, 15:00

Section C: Heavy Quarks

In the last decade many states in the spectrum of charmonium and bottomonium lying above the open-flavour threshold have been observed experimentally. Most of these states reside in the vicinity of strong thresholds and cannot be described by simple quark models. Description and understanding of such exotic states is a challenge for phenomenology of strong interactions which requires building...

18. Recent charmonium results at BESIII

Beijiang Liu

02/09/2016, 15:20

Section C: Heavy Quarks

Hadron spectroscopy is one of the most important physics goals of BESIII. BESIII brings great opportunities to study the XYZ states of charmonium by directly producing the Y states up to 4.6 GeV. We focus on the investigation of XYZ states and the discovery of new charged charmonium-like structures. Two isospin triplets Z(3900) and Z(4020) have been discovered, decaying into J/psi pi and hc...

172. Quarkonium hybrids in Effective Field Theories

Dr Jaume Tarrus Castella (TU Munich)

02/09/2016, 15:40

Section C: Heavy Quarks

In the last decade new, unexpected, quarkonium states close and above open flavor thresholds have been discovered. Some of these states are candidates for quarkonium hybrids, i.e states containg a gluonic excitation. Quarkonium hybrids are characterized by a set of well separated scales, in particular, the heavy quark and gluon dynamics have very different dynamical time scales, that be...

185. Heavy Hybrids: decay to and mixing with heavy quarkonium

Joan Soto (Universitat de Barcelona)

02/09/2016, 16:00

Section C: Heavy Quarks

In the framework of pNRQCD, we calculate the partial decay width of heavy hybrid states to heavy quarkonia, and the mixing potential between them. We discuss their phenomenological relevance concerning the identification of some XYZ states with heavy hybrids.

100. The Pc(4450) pentaquark-like structure and triangle singularity

Prof. Feng-Kun Guo (Institute of Theoretical Physics)

02/09/2016, 16:20

Section C: Heavy Quarks

We want to discuss the Pc(4450) pentaquark-like structure observed by the LHCb Collaboration in the J/psi proton final states. We point out that it is located exactly at the chi_{c1}-proton threshold, and coincides with the leading Landau singularity of the triangle loop Lambda(1890)-chi_{c1}-proton. We also discuss the possibility of distinguishing a genuine resonance from the kinematical singularity.

165. Pion exchange for Pc(4450)+ and related states

Timothy Burns

02/09/2016, 16:40

Section C: Heavy Quarks

Pion-exchange offers a natural explanation for Pc(4450)+ as a meson-baryon molecule, and implies a number of partner states. I discuss the properties of these partners and suggest experimental channels for their discovery. The molecular interpretation also implies that Pc(4450)+ is a mixture of isospins 1/2 and 3/2, which has characteristic signatures in production and decay. Several...

44. Description of the $X(4260)$ and $X(4360)$ mesons as a $\rho D \bar{D}$ system

Dr Melahat Bayar (Kocaeli University)

02/09/2016, 17:30

Section C: Heavy Quarks

X(4260) and X(4360) mesons

374. Multiquark resonances

Dr Alessandro Pilloni (Jefferson Lab)

02/09/2016, 17:50

Section C: Heavy Quarks

The number of multiquark states and the amount of details on their properties has been growing over the years. It is very recent the discovery of two pentaquarks and the confirmation of four tetraquarks, two of which had not been observed before. We present some considerations attempting a coherent description of the so called X and Z resonances. The prominent problems plaguing theoretical...

236. CANCELLED: Prediction of a Zc(4000) D∗Dbar∗ state and relationship to the claimed Zc(4025)

Francesca Aceti (IFIC - Universidad de Valencia)

02/09/2016, 18:10

Section C: Heavy Quarks

After discussing the OZI suppression of one light meson exchange in the interaction of with isospin I = 1 , we study the contribution of the two-pion exchange to the interaction and the exchange of heavy vectors, J/ψ for diagonal transitions and D* for transitions of to J/ψ ρ. We find these latter mechanisms to be weak, but enough to barely bind the system in J = 2 with a mass around 4000 MeV,...

243. $Z_c(3900)$: theory, experiment, lattice

Prof. Feng Kun Guo (Beijing, Inst. Theor. Phys.)

02/09/2016, 18:30

Section C: Heavy Quarks

In this talk we report on two recent works about the $Z_c(3900)$ resonance. A coupled channel T-matrix is used in the description of the $D^*\bar{D}$ and $J/\psi\pi$ spectra in which the $Z_c(3900)$ peak has been seen. The data can be well reproduced in two different scenarios, in which the $Z_c(3900)$ is a resonance or a virtual state. We also put this coupled channel $T$-matrix in a finite...

325. Investigating the Structure of X(4140) in QCD

Dr Huseyin Dag (Ozyegin University, Istanbul)

02/09/2016, 18:50

Section C: Heavy Quarks

This is a preliminary version of the work to be presented at Confinement XII, Thessalloniki, Greece.

252. QCD threshold logarithms analystic resumming

Prof. Giulia Ricciardi (Dipartimento di Fisica E Pancini Università di Napoli Federico II)

02/09/2016, 19:10

Section C: Heavy Quarks

We present a new technique to resum analytically large threshold logarithms in heavy quark decay which simplifies multi-scale problems and apply it to the B -> X_s gamma decay

275. CANCELLED: $\eta_c$ production at the LHC and indications on the understanding of $J/\psi$

Ce Meng (Peking University)

Section C: Heavy Quarks

$\eta_c$ production at the LHC and indications on the understanding of $J/\psi$

161. CANCELLED: AFTER@LHC: A fixed-target programme at the LHC for heavy-ion, hadron, spin and astroparticle physics

Barbara Antonina Trzeciak (Utrecht University)

Section C: Heavy Quarks

In this talk, we will review a number of recent ideas⋆ put forward in favour of a fixed-target programme at the LHC - AFTER@LHC. By extracting the beam with a bent crystal or by using an internal gas target, the multi-TeV LHC beams allow one to perform the most energetic fixed-target experiments ever and to study with high precision pp, pd and pA collisions at $\sqrt{s_{NN}}$=115 GeV and Pbp...

13. CANCELLED: Impact of eta_c hadroproduction data on charmonium production and polarization within NRQCD framework

Hong-Fei Zhang

Section C: Heavy Quarks

Recent $\eta_c$ hadroproduction data provided an excellent opportunity for the determination of the color-octet matrix elements for the charmonia production. This talk will present the theoretical results for the $\eta_c$ hadroproduction versus the LHCb data and its impact on the $J/\psi$ production and polarization.