Junhao Yin
(IHEP)
01/09/2017, 14:00
2) Hadron spectroscopy and exotics
The BESIII Experiment at the Beijing Electron Positron Collider (BEPC2) has accumulated the world's largest samples of e+e- collisions in the tau-charm region. Cross sections of e+e- --> pi+pi- psi(2S) above 4.0 GeV, and a charged structure has been observed in the pi psi(2S) mass spectrum. Cross sections of e+e- --> KKbar J/psi between 4189 and 4600 MeV. Compared with pi+ pi- J/psi, more...
Roberto Mussa
(INFN/Torino)
01/09/2017, 14:25
2) Hadron spectroscopy and exotics
We report the recent results on the measurement of charmonium-like and bottomonium-like resonances at Belle. The report includes the first observation of $Z_b(10610) \to B\bar{B}$ and $Z_b(10650) \to B\bar{B}^*$ and studies of bottomonium-like state using $\Upsilon(5S)$ and $\Upsilon(6S)$ data taken at Belle. We also report measurements of $B$ decays to charmonium and charmonium-like states.
Ao XU
(Tsinghua)
01/09/2017, 14:50
2) Hadron spectroscopy and exotics
We report on the first observation of excited hadronic states in both the charm and beauty sector with special emphasis on the observation of five excited Omega_c states.
Similar techniques are used to search the LHCb data for states observed in other datasets, such as the tetraquark state X(5568) whose evidence was reported by D0.
Prospects for searches of exotic states in b-hadron decays...
Tiesheng Dai
(U)
01/09/2017, 15:15
2) Hadron spectroscopy and exotics
Prof.
Javier Vijande Asenjo
(University of Valencia)
01/09/2017, 16:30
2) Hadron spectroscopy and exotics
In this talk I will review recent studies on multiquark spectroscopy regarding four, five and six quark systems making emphasis on the role played by confinement. I will discuss in detail all-heavy tetraquarks. I will also address the role played by entangled thresholds and the failure of heavy quark mass expansions in some particular systems. I would review some recent works in collaboration...
Mr
Muhammad Naeem Anwar
(ITP-CAS)
01/09/2017, 16:55
2) Hadron spectroscopy and exotics
In heavy quarkonia, hadronic transitions serve as an enlightened probe for the structure and help to establish the understanding of light quark coupling with heavy degree of freedom. We propose a new model to create light meson(s) in heavy quarkonium transitions, which is inspired by Nambu-Jona-Lasinio model. The model shows its potential to reproduce the observed decay widths and make...
Prof.
Xingtao Huang
(SDU)
02/09/2017, 14:00
2) Hadron spectroscopy and exotics
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...
Fabrizio Bianchi
(University of Turin)
02/09/2017, 14:00
2) Hadron spectroscopy and exotics
The BABAR Collaboration has an intensive program studying hadronic cross sections in
low-energy $e^+e^-$ annihilations, accessible via initial-state radiation.
Our measurements allow significant improvements in the precision of the
predicted value of the muon anomalous magnetic moment.
These improvements are necessary for shedding light on the current ~3 sigma
difference between the...
Dr
Marco Destefanis
(Università degli Studi di Torino and INFN)
02/09/2017, 14:25
2) Hadron spectroscopy and exotics
The anomalous magnetic moment of the muon, $(g-2)_\mu$, allows for one of the most precise tests of the Standard Model of particle physics. We report on recent results by the BESIII collaboration of exclusive hadronic cross section channels, such as the 2pi, 3pi, and 4pi final states. These measurements are of utmost importance for an improved calculation of the hadronic vacuum polarization...
Alexander Austregesilo
(Jefferson Lab)
02/09/2017, 14:25
2) Hadron spectroscopy and exotics
GlueX at Jefferson Lab aims to study the light meson spectrum with an emphasis on the search for light hybrid mesons. To this end, a linearly-polarized $9\,$GeV photon beam impinges on a hydrogen target contained within a hermetic detector with near-complete neutral and charged particle coverage. In 2016, the experiment completed its commissioning and subsequently started to take data in its...
Dr
召霞 孟
(高能所)
02/09/2017, 14:50
2) Hadron spectroscopy and exotics
Electromagnetic form factors of baryon provide fundamental information about its structure and dynamics. They constitute a rigorous test of nonperturbative QCD as well as of phenomenological models. Using data samples collected with BESIII detector at BEPCII collider, We measure Born cross section of e+e- -> ppbar at center-of-mass energy between 2.0GeV and 3.08GeV. The ratio |GE/GM| and |GM...
Xiaolong Wang
02/09/2017, 14:50
2) Hadron spectroscopy and exotics
The study of initial state radiation (ISR) events at Belle II provides independent and contiguous measurements of hadronic cross sections in and also contributes to the investigation of low-mass resonances spectroscopy. Belle II has the advantage that data at different energies will be accumulated at the same time, making the ISR analysis much simpler than other experiments where the data was...
Roberto Mussa
02/09/2017, 15:15
2) Hadron spectroscopy and exotics
The Belle II experiment, being constructed at the KEK laboratory in Japan, is a substantial upgrade of both the Belle detector and the KEKB accelerator. It aims to collect 50 times more data than existing B-Factory samples beginning in 2018.
Belle II is uniquely capable to study the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by...
Dr
Zhenyu ZHANG
(Wuhan University)
02/09/2017, 15:40
2) Hadron spectroscopy and exotics
The high-energy photoproduction of light-quark pseudoscalar and scalar mesons is an effective tool for understanding the properties of strong interaction in the nonperturbative regime. It has been investigated theoretically using Regge-cut phenomenology with massive quasi-particle exchange in high-energy regime, and the linearly polarized photon beam asymmetry $\Sigma$ can provide insight into...
Prof.
Yubing Dong
(Institute of High Energy Physics, Chinese Academy of Sciences, P. R. China)
03/09/2017, 14:00
2) Hadron spectroscopy and exotics
$d^*(2380)$ as a new dibaryon resonance was observed by WASW@COSY
experiments~\cite{Clement} recently. This discovery has triggered a great
interest to understand its intrinsic structure. In this talk, a theoretical
study of this new dibaryon with the help of the constituent chiral quark model
is briefly summarized. It is found that our approach could reasonable reproduce
the mass of...
Dr
Mikhail Bashkanov
(University of Edinburgh)
03/09/2017, 14:25
2) Hadron spectroscopy and exotics
Several new findings in the four, five and six quark systems reheat the interest in the field of multiquark states (beyond trivial $q\bar q$ and qqq). A lot of progress has recently been made in the 6q sector, on both the theoretical and experimental side. A resonance like structure observed in double-pionic fusion to the deuteron, at M=2.38 GeV with $\Gamma =70$ MeV and $I(J^P )=0(3^+)$ has...
Dr
Fei Huang
(University of Chinese Academy of Sciences)
03/09/2017, 14:50
2) Hadron spectroscopy and exotics
The high-precision cross-section data for the reaction $\gamma p \to K^{*+}\Lambda$ reported by the CLAS Collaboration at the Jefferson Laboratory have been analysed based on an effective Lagrangian approach in the tree-level Born approximation. Apart from the $t$-channel $K$, $\kappa$, $K^*$ exchanges, the $s$-channel nucleon ($N$) exchange, the $u$-channel $\Lambda$, $\Sigma$,...
GHALENOVI Zahra
03/09/2017, 15:15
2) Hadron spectroscopy and exotics
Dr
Wojciech Krzemień
03/09/2017, 16:30
2) Hadron spectroscopy and exotics
The KLOE experiment has collected 2.5 fb$^{-1}$ at the e+e- collider DAPHNE. The upgraded detector KLOE-2 has already collected 3.5 fb$^{-1}$ with a new beam crossing scheme, allowing for a reduced beam size and increased luminosity. Analysis of KLOE data is still in progress in different sectors.
Precision physics requires appropriate inclusion of higher order effects and the knowledge of...
Masayuki Niiyama
(Kyoto Univ.)
03/09/2017, 16:55
2) Hadron spectroscopy and exotics
The $e^+ e^-$ collision events recorded by the Belle detector provides a great opportunity to make a precision study of baryonic states. We report the recent results on the study of baryons at Belle. This includes discovery of charmed strange baryon $\Xi_c(3055)$, measurements of new decays of charmed bayrons $\Xi_c$ and $\Omega_c$, and study of exotic baryons from two-photon collisions.
云飞 龙
(Peking University)
03/09/2017, 17:20
2) Hadron spectroscopy and exotics
At present the world's largest sample of 1.3 billion J/psi events was accumulated at the BESIII detector, which provides a unique opportunity to investigate the eta/eta' decays via J/psi radiative or hadronic decays. The eta and eta' hadronic decays are sensitive tools for investigations of pi-pi and eta-pi interactions, symmetry breaking, and serve as a test of Chiral Perturbation Theory. In...
Mr
Jielei ZHANG
(Xinyang Normal University)
03/09/2017, 17:40
2) Hadron spectroscopy and exotics
The BESIII Experiment at the Beijing Electron Positron Collider (BEPC2) has accumulated the world's largest samples of e+e- collisions in the tau-charm region. Using a sample of 106 million psi(3686) decays, the branch fractions of psi(3686) -> gamma chi_c0, gamma chi_c1, gamma chi_c2 are determined to be (9.389 +- 0.014 +- 0.332)%, (9.905 +- 0.011 +- 0.353)%, and (9.621 +- 0.013 +- 0.272)%,...
