HADRON 2017

Session

Spectroscopy of mesons

25 Sept 2017, 16:45

Salamanca, Spain

135. Spectroscopy of charm hadrons at LHCb

Marco Pappagallo (Universita e INFN, Bari (IT))

25/09/2017, 16:45

Spectroscopy of mesons

Talk

LHCb continues to expand its world-leading sample of charmed hadrons collected during LHC’s Run 1 (2010-2012) and Run 2 (2015- present). With this data set, LHCb is discovering many previously unobserved charmed states and making the most precise determinations of the properties of known states. LHCb’s latest work on the spectroscopy of charmed hadrons is presented.

62. ARE THE X(4260) AND X(4360) MOLECULAR STATES?

Melahat Bayar (Kocaeli University)

25/09/2017, 17:10

Spectroscopy of mesons

Talk

We investigate the X(4260) and X(4360) within the framework of the Faddeev Equations under the fixed center approximation. We find a state of I=1 with masses around 4320 MeV and width about 25 MeV for the case of $\rho-X(3700)$ and 4256 MeV for the case of \barD-D_1(2420) with similar width to that of the $\rho-X(3700)$. Hence these states could be associated with the X(4260) and X(4360).

32. An analysis of the lattice QCD spectra for $D^*_{s0}(2317)$ and $D^*_{s1}(2460)$

Prof. Martinez Torres Alberto

25/09/2017, 17:30

Spectroscopy of mesons

Talk

In this talk I will present our results from a reanalysis of the energy leves obtained in a lattice QCD simulation from where the existence of bound states of $KD$ and $KD^*$ are induced and identified with the states $D^*_{s0}(2317)$ and $D^*_{s1}(2460)$. The study is done using effective field theories in a finite volume.

207. Decay width and coupling constants of charm and bottom mesons.

Ms Pallavi Gupta (Thapar University, Patiala), Dr alka Upadhyay (Associate Professor)

25/09/2017, 17:50

Spectroscopy of mesons

Talk

In the last decade, charmed and bottom meson spectroscopy have seen great success in experimental sector. Experiments like LHCb, Babar etc are providing many new states which are being added to their spectroscopy. Newly predicted states like B(5970), D_2(3000),D*(3000), B(5840) and many more still need to assign their proper place in the spectroscopy. So we explored these newly observed...

8. The study of B weak decay and the scalar DDbar bound state

Prof. Lianrong Dai (Liaoning Normal university)

25/09/2017, 18:10

Spectroscopy of mesons

Talk

I will present our recent work of [Eur Phys J C76 (2016) 121]. We study the B weak decay based on the chiral unitary approach that generates the X(3720) resonance, and make predictions for the DDbar invariant mass distribution. From the shape of the distribution, the existence of the resonance below threshold could be induced. We also predict the rate of production of the X(3720)...

189. Light hadron spectroscopy at BESIII

Jingqing Zhang (Ruhr University Bochum)

26/09/2017, 14:30

Spectroscopy of mesons

Talk

The unambiguous identification and systematic study of bound states beyond the constituent quark degrees of freedom, e.g., multiquark states or states with gluonic degrees of freedom (hybrids, glueballs) would provide validation of and valuable input to the quantitative understanding of QCD. Hadron spectroscopy is one of the most important physics goals of BESIII. Since 2009, BESIII has...

200. D->4pi, D->KKpipi amplitude analyses and properties of a1(1260), pi(1300), a1(1640)

Nicola Anne Skidmore (University of Bristol (GB))

26/09/2017, 14:55

Spectroscopy of mesons

Talk

The resonant substructure of the four-body decays D0→π+π−π+π− and D0→K+K−π+π− is studied using data collected by the CLEO experiment. An amplitude analysis is performed in order to disentangle the various intermediate state contributions. To limit the model complexity a data driven regularization procedure is applied. The broad resonances a1(1260)+, π(1300)+ and a1(1640)+ are studied in...

112. Three-body decays of quarkonium states at BABAR

Alessandro Pilloni (Jefferson Lab)

26/09/2017, 15:15

Spectroscopy of mesons

Talk

We report about recent results obtained at BABAR on three-body decays of charmonium and bottomonium states.
We present Dalitz plot analyses of $J/\psi$ three-body hadronic decays to $\pi^+\pi^-\pi^0$, $K^+K^-\pi^0$ and $K_S K^{\pm}\pi^{\mp}$ ?using the isobar and Veneziano models.The $J/\psi$ is produced through the Inital-State-Radiation process. We also perform Dalitz plot analyses of ...

155. Line-shape analysis of charmonium resonances

Dr Susana Coito (Jan Kochanowski University)

26/09/2017, 15:35

Spectroscopy of mesons

Talk

Using an unitarized effective Lagrangian, we study the deformed line-shape of the $\psi(3770)$, and of other charmonium resonances which were very recently discovered by the BESIII Collaboration. Nearby threshold effects are taken into account.

142. Bottom quark mass determination from bottomonium at N$^3$LO

Pablo G. Ortega (University of Salamanca)

26/09/2017, 15:55

Spectroscopy of mesons

Talk

The precise determination of hadron spectroscopy from fundamental principles pursues to unveil QCD at its non-perturbative regime.
The non-perturbative nature of QCD at hadronic scales implied the development of phenomenological approaches such as quark models or, more recently, computer-based calculations using Lattice QCD.
However, the unique properties of heavy quarkonium systems allow an...

212. Recent Results on Light-Meson Spectroscopy from COMPASS

Stefan Wallner (Technische Universitaet Muenchen (DE))

27/09/2017, 09:00

Spectroscopy of mesons

Talk

COMPASS is a multi-purpose fixed-target experiment at CERN aimed at studying the structure and spectrum of hadrons. The two-stage spectrometer has a good acceptance over a wide kinematic range and is thus able to measure a wide range of reactions. Light mesons are studied with a negative hadron beam (mostly $\pi^-$) with a momentum of $190~\text{GeV}/c$. The light-meson spectrum is...

233. "Diffractive production of $ \pi^-\pi^-\pi^+ $ and $\pi^-\pi^0\pi^0 $ systems at VES."

Dr Dmitri Ryabchikov (Institute for High Energy Physics (RU))

27/09/2017, 09:25

Spectroscopy of mesons

Talk

The VES experiment has collected high statistics for exclusive reactions with three pion final states:
$ \pi^-\pi^-\pi^+ $ (about $30\cdot10^6$ events) and $\pi^-\pi^0\pi^0 $ (about $16\cdot10^6$ events).
The $ 3\pi $ systems are produced by $\pi^-$ beam ( $ E_{beam} = 28.9 $ GeV ) impinging on the beryllium target.

The dominant production mechanism is the pomeron exchange between...

220. First results from an extended freed-isobar analysis at COMPASS

Fabian Michael Krinner (Technische Universitaet Muenchen (DE))

27/09/2017, 09:45

Spectroscopy of mesons

Talk

One of the goals of the COMPASS experiment is the precision study of light meson
spectroscopy, with data for various final states collected in two years of data
taking. With $46\cdot10^6$ exclusive events, the process
$\pi^-p\to\pi^-\pi^+\pi^-p$ constitutes the flagship of these channels.

Based on this data set, an extensive Partial Wave Analysis, using a total of 88
partial waves in the...

146. Tensor resonances in $\eta\pi$ using COMPASS data

Andrew Jackura (Indiana University)

27/09/2017, 10:05

Spectroscopy of mesons

Talk

We present results on the extraction of tensor resonances in the $\eta\pi$ system in a joint analysis between the JPAC and COMPASS collaborations. We use $S$-matrix principles unitarity and analyticity to constrain the reaction model. We find two $J^{PC}=2^{++}$ resonance poles, the $a_2$ and $a_2'$. We discuss extensions of the model to coupled channel systems and the $3\pi$ sector.

181. The glueball and meson spectrum, the meson weak decay constants and the strong effective coupling with the analytic (infrared) confinement

Dr Gurjav Ganbold (Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia; Institute of Physics and Technology, 210651, Ulaanbaatar, Mongolia.)

27/09/2017, 10:25

Spectroscopy of mesons

Talk

The properties of two-particle bound states have been investigated within a relativistic quantum-field model based on the analytically confined propagators of the constituents. The spectra of quark-antiquark and two-gluon stable states are defined by master equations similar to the ladder Bethe–Salpeter equation. The conventional meson spectrum has been estimated with reasonable accuracy in a...

95. Energy scan results at Belle

Yin Junhao (I)

27/09/2017, 11:15

Spectroscopy of mesons

Talk

Using Belle energy scan data we report first evidence for the
$\Upsilon(6S) \to \phi \chi_{bJ}(1P)$ transitions and measure the energy
dependence of the $e^+e^- \to \phi \chi_{bJ}(1P)$ cross sections. We
report also on energy dependence for other final states that consist of
bottomonia and light hadrons. Using Belle data collected at the Y(5S) we
measure the $B_s \to D_s X$ inclusive branching...

42. $\bar B^0$, $B^-$ and $\bar B^0_s$ decays into $J/\psi$ and $K \bar K$ or $\pi \eta$

Wei-Hong Liang (Guangxi Normal University)

27/09/2017, 11:35

Spectroscopy of mesons

Talk

We study the $\bar B^0_s \to J/\psi K^+ K^-$, $\bar B^0 \to J/\psi K^+ K^-$, $B^- \to J/\psi K^0 K^-$,
$\bar B^0 \to J/\psi \pi^0 \eta$ and $B^- \to J/\psi \pi^- \eta$ decays and compare their mass distributions with those obtained for the $\bar B^0_s \to J/\psi \pi^+ \pi^-$ and $\bar B^0 \to J/\psi \pi^+ \pi^-$. The approach followed consist in a factorization of the weak part and the...

86. An Effective Theory approach to $\bar{B}_s$ mesons involving $SU(3)$ heavy meson symmetry and constituent quark-model states

Pedro Fernandez-Soler (Instituto de Fisica Corpuscular (CSIC-University of Valencia))

27/09/2017, 11:55

Spectroscopy of mesons

Talk

The bottom partners of the $D_{s0}(2317)$ and $D_{s1}(2460)$ have not been measured yet but the existence of these bottom-strange $J^P=0^+$ and $1^+$ states is motivated by heavy quark flavor symmetry (HQFS) and heavy quark spin symmetry (HQSS).

In this talk we will present the predictions for such heavy quark partners using a unitarized effective approach involving $SU(3)$ chiral heavy meson...

91. Hadronic transitions in bottomonium at Belle

Elisa Guido (INFN Torino)

27/09/2017, 12:15

Spectroscopy of mesons

Talk

The study of hadronic transitions among bottomonium states, and their
relative magnitude, can be used as a bench test for non-perturbative
approaches to QCD. In particular, transitions through an eta meson,
despite involving a heavy quark spin symmetry violation, have been
measured to have an unexpectedly enhanced branching fraction with respect
to those through a dipion system. A set of...

46. On the pair correlations of neutral $K, D, B$ and $B_s$ mesons with close momenta produced in inclusive multiparticle processes

Dr Valery Lyuboshitz (Joint Institute for Nuclear Research, Dubna )

27/09/2017, 12:35

Spectroscopy of mesons

Talk

The phenomenological structure of inclusive cross-sections of the production of two neutral $K$ mesons in hadron--hadron, hadron--nucleus and nucleus--nucleus collisions is theoretically investigated taking into account the strangeness conservation in strong and electromagnetic
interactions. Relations describing the dependence
of the correlations of two short-lived and two long-lived neutral...

252. $\eta \to 3\pi$ decays and coupled channel extension of the Khuri-Treiman formalism

Miguel Albaladejo Serrano (IFIC-CSIC, U. Valencia)

28/09/2017, 16:45

Spectroscopy of mesons

Talk

There have recently been several high-statistics new measurements of the isospin violating decay $\eta \to 3\pi$. Besides the interest in its analysis, these and other data on three-body decays of mesons have originated a revival on the study and the application of the Khuri-Treiman equations. This is a dispersive formalism which allows to simultaneously incorporate the two-body elastic...

166. Calculation of strange resonances from Kπ scattering

Arkaitz Rodas Bilbao (Universidad Complutense de Madrid)

28/09/2017, 17:10

Spectroscopy of mesons

Talk

We present a determination of the mass, width and coupling of the strange resonances appearing in pion-kaon scattering, the much debated K_0(800), the scalar K_0(1430), the K_1(892) and k_1(1410) vectors, the spin-two K_2(1430) as well as the spin-three K_3(1780). The parameters of each resonance will be determined using a direct analytical continuation of the pion-kaon partial waves by...

213. Chiral model for the $D^+ \to K^+ K^- K^+$ decay amplitude

M.R. Robilotta (Instituto de Física - Universidade de São Paulo)

28/09/2017, 17:35

Spectroscopy of mesons

Talk

Isobar models, successful as they are in providing fits for heavy meson decays,
rely on both parameters which are not physically transparent and sums
of Breit-Wigner functions.
As an alternative, we propose a Multi-Meson-Model (Triple-M) for the
$D^+ \to K^+ K^- K^+$ amplitude.
The decay is assumed to be dominated by the process
$D^+\to W^+ \to K^+ K^- K^+$ and, therefore,
driven by...

27. Revisiting the axial anomaly: from pseudotensor mesons to the pseudoscalar glueball

Prof. Francesco Giacosa (Kielce University)

28/09/2017, 17:55

Spectroscopy of mesons

Talk

The axial anomaly is responsible for the masses and mixing of the mesons $\eta $ and $\eta' $ (especially the latter). An open question is if it affects also other sectors of hadronic phenomenology. We show that anomalous terms can be important to understand the spectroscopy of pseudotensor mesons $\eta_2 (1645) $ and $\eta_2 (1870) $ (which can be investigated in the GlueX experiment at...

159. The effects of explicit chiral symmetry breaking multiquark interactions on the spin 0 and 1 meson nonets: the ruling of the vector mesons.

Jorge Morais (FCTUC / CFisUC)

28/09/2017, 18:15

Spectroscopy of mesons

Talk

We have recently extended the scalar-pseudoscalar sector of a generalized NJL Lagrangian that includes all NLO non derivative interactions in Nc counting (including explicit symmetry breaking ones) in order to incorporate the spin 1 mesons in the low-lying ground state of QCD [1]. Upon bosonization, the well known mixing of the scalar-vector and of the pseudoscalar- axial-vector fields...

33. Searching for Hybrid Mesons with GlueX

Sean Dobbs (Florida State University)

29/09/2017, 11:15

Spectroscopy of mesons

Talk

Hybrid mesons consist of a quark-antiquark pair bound together by a gluonic field that is in an excited state. A rich spectrum of hybrid meson states has been predicted, but only a few experiments have reported evidence of their existence. Measuring the spectrum of these states will provide valuable information on the gluonic degrees of freedom of QCD in the quark-confinement regime.

The...

216. Light exotic meson candidates in COMPASS

Prof. Bernhard Ketzer (University of Bonn (DE))

29/09/2017, 11:40

Spectroscopy of mesons

Talk

The COMPASS experiment at CERN uses a high-energy pion beam scattered off protons and heavier nuclei to produce mesonic excitations, which are observed in multi-particle final states subjected to partial-wave analyses. In addition to studying the properties of established mesons with unprecedented accuracy, the large existing data samples allow us to detect possibly exotic states. These either...

72. Heavy meson interquark potential from a modified Schwinger-Dyson strong coupling

Prof. Pedro González (Universitat de València)

29/09/2017, 12:00

Spectroscopy of mesons

Talk

A truncated solution of a gauge invariant subset of the Schwinger-Dyson (SD) equations for QCD leads to a functional form of the strong running coupling showing a freezing in the infrared, which is best understood as a dynamical generation of a gluon mass function, giving rise to a momentum dependence which is free from infrared divergences. The generation of such a mass is associated with the...

225. Hadron phenomenology from Dyson-Schwinger equations

Dr Richard Williams (University of Giessen)

29/09/2017, 12:20

Spectroscopy of mesons

Talk

The Green's functions of QCD encode the properties of hadrons, with the appearance of (colour singlet) poles in n-point functions corresponding to bound-states and resonances. There are several techniques by which such information may be extracted, including lattice QCD and functional methods. We discuss recent progress in applying nPI effective action techniques to the systematic truncation...

17. Coherent double neutral Pion Photoproduction off Deuterons

Michael Sven Günther (Universität Basel)

29/09/2017, 12:40

Spectroscopy of mesons

Talk

Photoproduction of meson pairs off nucleons has gained a lot of interest mainly because it allows to study sequential decays of nucleon resonances via some intermediate excited states. This may give access to states that have only tiny decay branching ratios for direct decays to the nucleon ground state by emission of a single meson. In particular, pion pairs and pi-eta pairs have been studied...