Conveners
Workshop on Exotic Hadrons: Light hadron exotics (experimental + theoretical)
- Roman Mizuk (Lebedev Physical Institute)
- Alex Bondar (Budker Institute of Nuclear Physics (RU))
- Tomasz Skwarnicki (Syracuse University (US))
Workshop on Exotic Hadrons
- There are no conveners in this block
Workshop on Exotic Hadrons
- Alex Bondar (Budker Institute of Nuclear Physics (RU))
- Tomasz Skwarnicki (Syracuse University (US))
- Roman Mizuk (Lebedev Physical Institute)
Workshop on Exotic Hadrons
- There are no conveners in this block
Workshop on Exotic Hadrons
- There are no conveners in this block
Workshop on Exotic Hadrons
- Roman Mizuk (Lebedev Physical Institute)
- Tomasz Skwarnicki (Syracuse University (US))
- Alex Bondar (Budker Institute of Nuclear Physics (RU))
Workshop on Exotic Hadrons
- There are no conveners in this block
Workshop on Exotic Hadrons
- There are no conveners in this block
Finding evidence supporting the existence of exotic states is one of the most exciting aspects of modern hadron physics. In contrast to the meson sector, the existence of exotic baryons is much more controversial, especially since the unprecedented episode of the rise and fall of the $uudd\bar{s}$ pentaquark. Recently though, the matter of pentaquarks has been resurrected by the observation of...
A new Facility for Antiproton an Ion Research (FAIR) is being build at GSI in Darmstadt, where PANDA (antiProton Annihilations at Darmstadt) will be one of the key experiments. The versatile PANDA detector together with the usage of an intense and high quality antiproton beam provides a unique environment to study the formation of hadrons and the dynamics of color confinement. As the...
With the world's largest sample of J/Psi events accumulated at the BESIII detector, a few new observations were reported in recent years. In this talk,
the progress on the light exotic candidates and the prospective are highlighted.
We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the pion emission for the known excited $\Lambda_c^*$ (Lc(2595), Lc(2625), Lc(2765), Lc(2880), Lc(2940)) baryons. We find that we can explain the decay widths of the...
Heavy quark hadrons are subject to recent interests due to discoveries of new exotic states. To understand their properties with suitable constituents, production and decay reactions are useful. In my talk, I will discuss reaction mechanisms for possible future J-PARC experiments. First example is the pion induced Pc productions based on the Reggeon reaction mechanism. We discuss the cross...
I will introduce two activities on hadron spectroscopy at J-PARC.
(I) Since the $\Lambda(1405)$ hyperon is located just below the $\bar{K}N$ threshold,
it is said that $\Lambda(1405)$ is a deeply bound $\bar{K}N$ state.
There is a long standing argument if $\Lambda(1405)$ has
a so-called double pole structure [1,2,3]. In particular, a chiral
unitary model calculation claims that a pole...
The firm understanding of standard quark-antiquark states (including excited states) is necessary to perform search of non-conventional mesons with the same quantum numbers. In this talk, we study the phenomenology of two nonets of excited vector mesons, which predominantly correspond to radially excited vector mesons with quantum numbers $n \hspace{0.15cm} ^{2s+1}L_{J} = 2 ^{3}S_{1}$ and to...
We analyse, within a dipole model, the final, inclusive HERA DIS cross section
data in the low x region, using fully correlated errors. We show, that these h
ighest precision data are very well described within the dipole mod
el framework starting from Q2 values of 3.5 GeV2 to the highest values of
Q2= 250 GeV2. To analyze the saturation effects we evaluated the data includ
ing also the very...
After more than ten years of experimental and theoretical scrutiny, the now venerable $X(3872)$, $X(3915)$ and other neutral $XYZ$ states remain puzzling mysteries. It seems that the more we learn about them, the more they defy understanding. Basic properties of the $X(3872)$, including its natural width and whether its mass is above or below the ($m_{D^0} + m_{D^{*0}}$) threshold, are still...
In this talk we will present the experimental studies of the tetraquark candidate Zc states via its decays to charmonium states. The main results discussed are from the BESIII experiment, but results in other experiments will also be covered. We will show some model interpretations on these Z_c's and their potential connections to the Z_c states observed in decays to open charm mesons.
We will review the status and recent results on the charged
bottomonium-like states $Z_b(10610)$ and $Z_b(10650)$, produced in single pion
transitions from the $\Upsilon(5S)$ and $\Upsilon(6S)$. We will describe
their observation in the $\pi\Upsilon(nS)$ and $\pi h_b(nP)$ channels,
measurement of their spins and parities, and investigation of the open
flavor decays. Possible interpretations of...
Apart from the traditional vector charmonium states $\psi(3770), \psi(4040), \psi(4160)$, and $\psi(4415)$ above open charm, some experiments have observed a lot of non-traditional vector charmonium state which we call Y states, such as Y(4260) in $\pi^+\pi^- J/\psi (\pi^0\pi^0 J/\psi)$ line shape, Y(4360) and Y(4660) in $\pi^+pi^-\psi(3686)$ line shape. People also observed the...
We will review the status and recent results on vector bottomonium-like
states above the $B\bar{B}$ threshold: the $\Upsilon(4S)$, $\Upsilon(5S)$
and $\Upsilon(6S)$. We will discuss their decays to both open and hidden flavor
channels and their line-shapes in various exclusive cross sections. The
properties of these states are at odds with the expectations for a pure
$b\bar{b}$ state, proposed...
Recent BESIII results on exotic hadron candidates, including both heavy charmonium-like states and light hadron exotics, will be reviewed, as well as introductions to the BEPCII collider and BEESIII detector. Future BESIII running plans, specially the physics program for the extotic hadron spectropy, will be discussed.
A number of charged and neutral candidates for exotic mesons with hidden charm were observed in amplitude analyses of B meson decays, explaining the peaking structures in $J/\psi\pi^{\pm}$, $\chi_{c1}\pi^{\pm}$, $\psi(2S)\pi^{\pm}$ and $J/\psi\phi$ mass distributions. We review the experimental information on these candidates and discuss their possible interpretations.
all LHCb measurements related to pentaquark candidates will are presented. Possible interpretations of the Pc(4450) and Pc(4380) states will be discussed.
We develop a moment QCD sum rule method augmented by fundamental inequalities to study the existence of exotic doubly hidden-charm/bottom $QQ\bar Q\bar Q$ tetraquark states made of four heavy quarks. Using the compact diquark-antidiquark configuration, we calculate the mass spectra of these tetraquark states. There are 18 hidden-charm $cc\bar c\bar c$ tetraquark currents with $J^{PC} =...
Study of the charmonium states play important role in understanding of the strong interaction. The most interesting charmonium states lie near or above open charm thresholds. Nature of such states is of interest to modern physics. Recent lattice calculations have performed the necessary extrapolations and considered spectra as well as certain radiative transitions. The lattice QCD simulations...
We developed a Friedrichs-model-like scheme in studying the hadron
resonance phenomenology and present that the hadron resonances might
be regarded as the Gamow states produced by a Hamiltonian in which
the bare discrete state is described by the result of usual quark
potential model and the interaction part is described
by the quark pair creation model. In an almost...
The Abelian decomposition of QCD which decomposes
the gluons to the color neutral binding gluons
(the neurons and the monopoles) and the colored
valence gluons (the chromons) gauge independently
naturally generalizes the quark model to the quark
and chromon model which can play the central role
in hadron spectroscopy. We discuss how the quark
and chromon model describes the glueballs and...
In the talk, I examine the issues of the amplitude analysis related to the exotic states.
A building of the cascade decay amplitude becomes a non-trivial problem especially in the presence of the spin of particles in the final state.
We compare the helicity amplitudes and the amplitudes in the tensor formalism considering singularities and the crossing properties.
An interpretation of...
Between November $1974$, when the $J/\psi$ particle was discovered, and $2003$,
when the $X(3872)$ resonance was hunted by the Belle Collaboration, the
charmonium spectrum was fairly explained by naive quark models. However, the
exploration of the spectrum for energies above the $D\bar{D}$ threshold has led
to the appearance of unexpected states, difficult to accommodate in the naive...
We show, on the basis of an analysis of four-point correlation
functions of quark bilinear currents in different channels and
the properties of leading and subleading QCD diagrams in the
large-$N_c$ limit, that if tetraquarks exist, then they generally
contribute at $N_c$-subleading orders of connected amplitudes.
This implies that, irrespective of their flavor content, tetraquarks
should...
I will discuss several topics of imminent interest in heavy quark spectroscopy, starting with
deuteron-like exotic hadrons near two-hadron thresholds, including putative open flavor states,
bottom analogue of X(3872), D_s D_s* states and doubly-heavy dibaryons. I will also discuss
all-heavy tetraquarks and bottom analogues of the narrow D_s states. In addition, I will focus
on two types of...
Is there a common Ariadne thread for all Exotic Hadrons?
