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Title: Multiquark resonances

Abstract

Multiquark resonances are undoubtedly experimentally observed. The number of states and the amount of details on their properties have 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 mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances. The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building. Lastly, data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research.

Authors:
 [1];  [2]; ORCiD logo [3]
  1. Columbia Univ., New York, NY (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. "Sapienza" Univ. di Roma, Roma (Italy); CERN, Geneva (Switzerland)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1345496
Alternate Identifier(s):
OSTI ID: 1397932
Report Number(s):
JLAB-THY-16-2301; DOE/OR/23177-3888; arXiv:1611.07920
Journal ID: ISSN 0370-1573; PII: S037015731630391X; TRN: US1701186
Grant/Contract Number:  
AC05-06OR23177; FG02-11ER41743
Resource Type:
Accepted Manuscript
Journal Name:
Physics Reports
Additional Journal Information:
Journal Volume: 668; Journal Issue: C; Journal ID: ISSN 0370-1573
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; tetraquarks; pentaquarks; exotic hadron resonances

Citation Formats

Esposito, A., Pilloni, A., and Polosa, Antonio D.. Multiquark resonances. United States: N. p., 2016. Web. https://doi.org/10.1016/j.physrep.2016.11.002.
Esposito, A., Pilloni, A., & Polosa, Antonio D.. Multiquark resonances. United States. https://doi.org/10.1016/j.physrep.2016.11.002
Esposito, A., Pilloni, A., and Polosa, Antonio D.. Fri . "Multiquark resonances". United States. https://doi.org/10.1016/j.physrep.2016.11.002. https://www.osti.gov/servlets/purl/1345496.
@article{osti_1345496,
title = {Multiquark resonances},
author = {Esposito, A. and Pilloni, A. and Polosa, Antonio D.},
abstractNote = {Multiquark resonances are undoubtedly experimentally observed. The number of states and the amount of details on their properties have 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 mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances. The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building. Lastly, data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research.},
doi = {10.1016/j.physrep.2016.11.002},
journal = {Physics Reports},
number = C,
volume = 668,
place = {United States},
year = {2016},
month = {12}
}

Journal Article:

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Cited by: 39 works
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Is <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> a possible candidate as a hybrid meson?
journal, January 2005


<mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4140</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>: Possible options
journal, August 2009


Hybrid mesons from quenched QCD
journal, May 1997


Evidence for hybrid mesons $$Q\bar QG$$
journal, November 1984

  • Ono, Seiji
  • Zeitschrift für Physik C Particles and Fields, Vol. 26, Issue 2
  • DOI: 10.1007/BF01421771

Why hybrid meson coupling to two S-wave mesons is suppressed
journal, June 1997


Suppressed decay into open charm for the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4260</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> being an hybrid
journal, December 2005


Born-Oppenheimer approximation for the X Y Z mesons
journal, July 2014


Lattice QCD study of generalized gluelumps
journal, January 2014


How resonances can synchronize with thresholds
journal, May 2008


Reinterpreting several narrow ‘resonances’ as threshold cusps
journal, September 2004


An explanation of Belle states Z b (10610) and Z b (10650)
journal, September 2011


Z b and Z c exotic states as coupled channel cusps
journal, February 2015


Could the near-threshold X Y Z states be simply kinematic effects?
journal, March 2015


Triangle singularities and XYZ quarkonium peaks
journal, July 2015


Singularities in the physical region
journal, July 1965


Final-State Interactions and the Simulation of Resonances
journal, February 1967


Dalitz plot distributions in presence of triangle singularities
journal, June 2016


Charged charmonium-like Z + ( 4430 ) from rescattering in conventional B decays
journal, September 2015


How to reveal the exotic nature of the P c ( 4450 )
journal, October 2015


Remarks on the Pc structures and triangle singularities
journal, October 2016

  • Guo, Feng-Kun; Meißner, Ulf-G.; Nieves, Juan
  • The European Physical Journal A, Vol. 52, Issue 10
  • DOI: 10.1140/epja/i2016-16318-4

New charmonium states in QCD sum rules: A concise review
journal, December 2010


Sum Rules for Charmonium and Charmed Mesons in Quantum Chromodynamics
journal, March 1977


Charmonium and gluons
journal, May 1978


QCD and resonance physics. theoretical foundations
journal, February 1979


QCD sum rules for the X ( 3872 ) as a mixed molecule-charmonium state
journal, September 2009


QCD SUM RULES FOR THE $Z_c^+(3900)$ STATE
journal, January 2014

  • Navarra, F. S.; Dias, J. M.; Nielsen, M.
  • International Journal of Modern Physics: Conference Series, Vol. 26
  • DOI: 10.1142/S2010194514600696

$$Z_c(4200)^+$$ Z c ( 4200 ) + decay width as a charmonium-like tetraquark state
journal, August 2015


Strong Z c + ( 3900 ) J / ψ π + ; η c ρ + decays in QCD
journal, April 2016


Mass spectra of Z c and Z b exotic states as hadron molecules
journal, September 2015


The Z b ( 10 610 ) and Z b ( 10 650 ) as axial-vector tetraquark states in the QCD sum rules
journal, October 2014


Tetraquark state candidates: Y(4260), Y(4360), Y(4660), and $$Z_c(4020/4025)$$ Z c ( 4020 / 4025 )
journal, July 2016


Can the X ( 3872 ) be a 1 ++ four-quark state?
journal, January 2007


How to calculate the elastic scattering matrix in two-dimensional quantum field theories by numerical simulation
journal, July 1990


Two-particle states on a torus and their relation to the scattering matrix
journal, May 1991


Signatures of unstable particles in finite volume
journal, October 1991


Color structure of Yang-Mills theory with static sources in a periodic box
journal, August 2015


Lattice QCD signal for a bottom-bottom tetraquark
journal, June 2013


Tetraquark bound states in the heavy-light heavy-light system
journal, December 2012


Evidence for the existence of u d b ¯ b ¯ and the nonexistence of s s b ¯ b ¯ and c c b ¯ b ¯ tetraquarks from lattice QCD
journal, July 2015


Evidence for X ( 3872 ) from D D * Scattering on the Lattice
journal, November 2013


Doubly charmed tetraquarks in B c and Ξ b c decays
journal, September 2013


Charmed tetraquarks <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:math> and <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:math> from dynamical lattice QCD simulations
journal, February 2014


Gluon excitations of the static quark potential and the hybrid quarkonium spectrum
journal, April 1998


Ab Initio Study of Hybrid b ¯ gb Mesons
journal, May 1999


Excited and exotic charmonium spectroscopy from lattice QCD
journal, July 2012

  • Liu, Liuming; Moir, Graham; Peardon, Michael
  • Journal of High Energy Physics, Vol. 2012, Issue 7
  • DOI: 10.1007/JHEP07(2012)126

Potential model calculations and predictions for heavy quarkonium
journal, April 2007


Confirmation of a charged charmoniumlike state Z c ( 3885 ) in e + e π ± ( D D ¯ * ) with double D tag
journal, November 2015


Observation of the charged hadron <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msubsup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msubsup><mml:mo stretchy="false">(</mml:mo><mml:mn>3900</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> and evidence for the neutral <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msubsup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup><mml:mo stretchy="false">(</mml:mo><mml:mn>3900</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> in <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mo>→</mml:mo><mml:mi>π</mml:mi><mml:mi>π</mml:mi><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi></mml:math> at <mml:math altimg="si4.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>4170</mml:mn><mml:mspace width="0.25em"/><mml:mtext>MeV</mml:mtext></mml:math>
journal, December 2013


Observation of a Neutral Structure near the D D ¯ * Mass Threshold in e + e ( D D ¯ * ) 0 π 0 at s = 4.226 and 4.257 GeV
journal, November 2015


Observation of a Charged Charmoniumlike Structure in e + e ( D * D ¯ * ) ± π at s = 4.26 GeV
journal, April 2014


Observation of e + e π 0 π 0 h c and a Neutral Charmoniumlike Structure Z c ( 4020 ) 0
journal, November 2014


Observation of a Neutral Charmoniumlike State Z c ( 4025 ) 0 in e + e ( D * D ¯ * ) 0 π 0
journal, October 2015


Observation of Y ( 3940 ) J / ψ ω in B J / ψ ω K at BABAR
journal, August 2008


Observation of a Charmoniumlike Enhancement in the γ γ ω J / ψ Process
journal, March 2010


Study of X ( 3915 ) J / ψ ω in two-photon collisions
journal, October 2012


Observation of a Charmoniumlike State Produced in Association with a J / ψ in e + e Annihilation at s 10.6 GeV
journal, February 2007


Production of New Charmoniumlike States in e + e J / ψ D ( * ) D ¯ ( * ) at s 10.6 GeV
journal, May 2008


Measurement of the e + e π + π J / ψ Cross Section Via Initial-State Radiation at Belle
journal, November 2007


Search for the Z 1 ( 4050 ) + and Z 2 ( 4250 ) + states in B ¯ 0 χ c 1 K π + and B + χ c 1 K S 0 π +
journal, March 2012


Measurement of e + e π + π ψ ( 2 S ) via initial state radiation at Belle
journal, June 2015


Observation of a new charged charmoniumlike state in B ¯ 0 J / ψ K π + decays
journal, December 2014


Study of e + e ω χ c J at Center of Mass Energies from 4.21 to 4.42 GeV
journal, March 2015


Observation of a Broad Structure in the π + π J / ψ Mass Spectrum around 4.26 GeV / c 2
journal, September 2005


Charmonium Decays of Y ( 4260 ) , ψ ( 4160 ) , and ψ ( 4040 )
journal, April 2006


Confirmation of the Y ( 4260 ) resonance production in initial state radiation
journal, November 2006


Evidence for a New Resonance and Search for the Y ( 4140 ) in the γ γ ϕ J / ψ Process
journal, March 2010


Observation of Two Resonant Structures in e + e π + π ψ ( 2 S ) via Initial-State Radiation at Belle
journal, October 2007


Study of the reaction e + e ψ ( 2 S ) π + π via initial-state radiation at BaBar
journal, June 2014


Dalitz analysis of B K π + ψ decays and the Z ( 4430 ) +
journal, August 2009


Experimental constraints on the spin and parity of the Z ( 4430 ) +
journal, October 2013


Search for the Z ( 4430 ) at BABAR
journal, June 2009


Observation of the Resonant Character of the Z ( 4430 ) State
journal, June 2014


Observation of a Near-Threshold Enhancement in the e + e Λ c + Λ c Cross Section Using Initial-State Radiation
journal, October 2008


Search for Structure in the B s 0 π ± Invariant Mass Spectrum
journal, October 2016


Observation of Two Charged Bottomoniumlike Resonances in Υ ( 5 S ) Decays
journal, March 2012


Observation of Z b ( 10610 ) and Z b ( 10650 ) Decaying to B Mesons
journal, May 2016


First observation of the Z b 0 ( 10610 ) in a Dalitz analysis of Υ ( 10860 ) Υ ( n S ) π 0 π 0
journal, September 2013


Selection Rules for the Dematerialization of a Particle into Two Photons
journal, January 1950


The Physics of the B Factories
journal, November 2014


Exotic Heavy Quarkonium Spectroscopy: a Mini-Review
journal, September 2012

  • Faccini, Riccardo; Pilloni, Alessandro; Polosa, Antonio D.
  • Modern Physics Letters A, Vol. 27, Issue 29
  • DOI: 10.1142/S021773231230025X

Issues and Opportunities in Exotic Hadrons
journal, April 2016


Resonances in QCD
journal, April 2016


Observation of Large CP Violation in the Neutral B Meson System
journal, August 2001


Study of the B J / ψ K π + π decay and measurement of the B X ( 3872 ) K branching fraction
journal, April 2005


Observation and Properties of the X ( 3872 ) Decaying to J / ψ π + π in p p ¯ Collisions at s = 1.96 T e V
journal, October 2004


Bounds on the width, mass difference and other properties of X ( 3872 ) π + π J / ψ decays
journal, September 2011


Measurement of the Dipion Mass Spectrum in X ( 3872 ) J / ψ π + π Decays
journal, March 2006


Analysis of the Quantum Numbers J P C of the X (3872) Particle
journal, March 2007


Search for B + X ( 3872 ) K + , X ( 3872 ) J / ψ γ
journal, October 2006


Evidence for X ( 3872 ) ψ ( 2 S ) γ in B ± X ( 3872 ) K ± Decays and a Study of B c c ¯ γ K
journal, March 2009


Observation of X ( 3872 ) J / ψ γ and Search for X ( 3872 ) ψ γ in B Decays
journal, August 2011


SEARCH FOR A CHARMONIUM ASSIGNMENT FOR THE X (3872)
journal, January 2005


The 2 + assignment for the X ( 3872 )
journal, October 2010


Remarks on the quantum numbers of X ( 3872 ) from the invariant mass distributions of the ρ J / ψ and ω J / ψ final states
journal, January 2012


Spin of the X ( 3872 )
journal, September 2012


J / ψ ω decay channel of the X ( 3872 ) charm meson molecule
journal, July 2013


Determination of the X ( 3872 ) Meson Quantum Numbers
journal, May 2013


Quantum numbers of the X ( 3872 ) state and orbital angular momentum in its ρ 0 J / ψ decay
journal, July 2015


Observation of a Near-Threshold D 0 D ¯ 0 π 0 Enhancement in B D 0 D ¯ 0 π 0 K Decay
journal, October 2006


Study of the B X ( 3872 ) ( D * 0 D ¯ 0 ) K decay
journal, February 2010


Using line shapes to discriminate between binding mechanisms for the X ( 3872 )
journal, July 2010


Lineshapes for composite particles with unstable constituents
journal, May 2010


Interplay of quark and meson degrees of freedom in a near-threshold resonance: Multi-channel case
journal, August 2011

  • Hanhart, C.; Kalashnikova, Yu. S.; Nefediev, A. V.
  • The European Physical Journal A, Vol. 47, Issue 8
  • DOI: 10.1140/epja/i2011-11101-9

Evidence for the decay <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:mi mathvariant="normal">X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">→</mml:mo><mml:mi mathvariant="normal">ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:mi mathvariant="normal">S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mi mathvariant="normal">γ</mml:mi></mml:math>
journal, September 2014


Diagnostic decays of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>
journal, September 2004


Estimate of the partial width for X ( 3872 ) into p p ¯
journal, February 2008


Measurements of the branching fractions of $B^{+} \to p \bar{p} K^{+}$ decays
journal, June 2013


Observation of X ( 3872 ) in B X ( 3872 ) K π decays
journal, March 2015


Measurements of the Absolute Branching Fractions of B ± K ± X c c ¯
journal, February 2006


Study of B X ( 3872 ) K , with X ( 3872 ) J / ψ π + π
journal, June 2008


Precision Measurement of the X ( 3872 ) Mass in J / ψ π + π Decays
journal, October 2009


Search for a charged partner of the X ( 3872 ) in the B meson decay B X K , X J / ψ π π 0
journal, February 2005


Two charmoniumlike charged axial resonances near 3885 MeV
journal, October 2016


Evidence of a New Narrow Resonance Decaying to χ c 1 γ in B χ c 1 γ K
journal, July 2013


Search for resonant <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>B</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>h</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi></mml:math> decays at Belle
journal, May 2008


Search for X ( 3872 ) in γ γ Fusion and Radiative Production at CLEO
journal, January 2005


An improved limit for Γ e e of X ( 3872 ) and Γ e e measurement of ψ ( 3686 )
journal, October 2015


Observation of Z c ( 3900 ) 0 in e + e π 0 π 0 J / ψ
journal, September 2015


Search for Z c ( 3900 ) ± ω π ±
journal, August 2015


Search for exclusive photoproduction of Z c ± (3900) at COMPASS
journal, March 2015


Observation of Anomalous Υ ( 1 S ) π + π and Υ ( 2 S ) π + π Production near the Υ ( 5 S ) Resonance
journal, March 2008


First Observation of the P -Wave Spin-Singlet Bottomonium States h b ( 1 P ) and h b ( 2 P )
journal, January 2012


Hidden-beauty charged tetraquarks and heavy quark spin conservation
journal, January 2015


Amplitude analysis of e + e ϒ ( n S ) π + π at s = 10.866 GeV
journal, April 2015


Tetraquark interpretation of the charged bottomonium-like states Z b ± ( 10610 ) and Z b ± ( 10650 ) and implications
journal, March 2012


A case for hidden tetraquarks based on cross section between and 11.20 GeV
journal, February 2010


Tetraquark Interpretation of the BELLE Data on the Anomalous Υ ( 1 S ) π + π and Υ ( 2 S ) π + π Production near the Υ ( 5 S ) Resonance
journal, April 2010


Measurement of the e + e b b ¯ Cross Section between s = 10.54 and 11.20 GeV
journal, January 2009


Measurements of the ϒ ( 10860 ) and ϒ ( 11020 ) resonances via σ ( e + e ϒ ( n S ) π + π )
journal, January 2016


Consequences of heavy-quark symmetries for hadronic molecules
journal, September 2013


Observation of e + e π + π π 0 χ b J and Search for X b ω ϒ ( 1 S ) at s = 10.867    GeV
journal, September 2014


Search for the X b and other hidden-beauty states in the π + π ϒ ( 1 S ) channel at ATLAS
journal, January 2015


Discovery of a Narrow Resonance in e + e Annihilation
journal, December 1974


Y ( 4260 ) as the first S -wave open charm vector molecular state?
journal, October 2014


Evidence that the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4660</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> is an <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>980</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi>ψ</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> bound state
journal, July 2008


Observation of e + e − → K + K − J / ψ via initial-state radiation at Belle
journal, January 2008


Updated cross section measurement of e + e K + K J / ψ and K S 0 K S 0 J / ψ via initial state radiation at Belle
journal, April 2014


Determining the upper limit of <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>Γ</mml:mi><mml:mrow><mml:mi>e</mml:mi><mml:mi>e</mml:mi></mml:mrow></mml:msub></mml:math> for the <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4260</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>
journal, September 2006


Observation of ψ ( 4040 ) and ψ ( 4160 ) decay into η J / ψ
journal, March 2013


Combined fit to BABAR and Belle data on e + e π + π ψ ( 2 S )
journal, July 2008


Study of the exclusive initial-state-radiation production of the D D ¯ system
journal, December 2007


Exclusive initial-state-radiation production of the D D ¯ , D * D ¯ , and D * D ¯ * systems
journal, May 2009


Measurement of charm production cross sections in e + e annihilation at energies between 3.97 and 4.26 GeV
journal, October 2009


Measurement of the e + e D 0 D * π + cross section using initial-state radiation
journal, November 2009


Observation of the h c ( 1 P ) Using e + e Collisions above the D D ¯ Threshold
journal, July 2011


Study of e + e p p ¯ using initial state radiation with BABAR
journal, January 2006


Observation of e + e ω χ c 1 , 2 near s = 4.42 and 4.6 GeV
journal, January 2016


χ c 0 ω production in e + e annihilation through ψ ( 4160 )
journal, February 2015


Observation of a Resonancelike Structure in the π + ψ Mass Distribution in Exclusive B K π + ψ Decays
journal, April 2008


Model-independent confirmation of the Z ( 4430 ) state
journal, December 2015


Evidence for a Narrow Near-Threshold Structure in the J / ψ ϕ Mass Spectrum in B + J / ψ ϕ K + Decays
journal, June 2009


Search for the X ( 4140 ) state in B + J / ψ ϕ K + decays
journal, May 2012


Search for the X ( 4140 ) state in B + J / ψ ϕ K + decays with the D0 detector
journal, January 2014


Study of B ± , 0 J / ψ K + K K ± , 0 and search for B 0 J / ψ ϕ at BaBar
journal, January 2015


Inclusive Production of the X ( 4140 ) State in p p ¯ Collisions at D0
journal, December 2015


Hadronic molecule structure of the Y ( 3940 ) and Y ( 4140 )
journal, September 2009


Search for the Y ( 4140 ) via e + e γ ϕ J / ψ at s = 4.23 , 4.26 and 4.36 GeV
journal, February 2015


The pentaquark candidates in the dynamical diquark picture
journal, October 2015


LHCb pentaquark as a D ¯ * Σ c D ¯ * Σ c * molecular state
journal, November 2015


Photoproduction of hidden charm pentaquark states P c + ( 4380 ) and P c + ( 4450 )
journal, August 2015


Observation of a New D s J Meson in B + D ¯ 0 D 0 K + Decays
journal, March 2008


Higher charmonia
journal, September 2005


Where is the χ c 0 ( 2 P ) ?
journal, November 2012


Is the X ( 3915 ) the χ c 0 ( 2 P ) ?
journal, March 2015


X ( 3915 ) as a D s D ¯ s bound state
journal, June 2015


B c ± decays into tetraquarks
journal, August 2016


Interpreting the X (5568)
journal, September 2016


How the X (5568) Challenges Our Understanding of QCD
journal, May 2016

  • Guo, Feng-Kun; Meißner, Ulf-G.; Zou, Bing-Song
  • Communications in Theoretical Physics, Vol. 65, Issue 5
  • DOI: 10.1088/0253-6102/65/5/593

Hadron Spectroscopy — A 2005 Snapshot
conference, January 2006

  • Rosner, Jonathan L.
  • XXV PHYSICS IN COLLISION: Proceedings of the XXV International Conference on Physics in Collision, AIP Conference Proceedings
  • DOI: 10.1063/1.2173591

Interpretations for the X(4160) observed in the double charm production at B factories
journal, April 2008


Systematic study of Z c + family from a multiquark color flux-tube model
journal, August 2015


HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes)
journal, January 2001

  • Corcella, Gennaro; Knowles, Ian G.; Marchesini, Giuseppe
  • Journal of High Energy Physics, Vol. 2001, Issue 01
  • DOI: 10.1088/1126-6708/2001/01/010

PYTHIA 6.4 physics and manual
journal, May 2006


Measurement of Prompt Charm Meson Production Cross Sections in p p ¯ Collisions at s = 1.96 T e V
journal, December 2003


Effects of Configuration Interaction on Intensities and Phase Shifts
journal, December 1961


A unified theory of nuclear reactions. II
journal, August 1962


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    • Ablikim, M.; Achasov, M. N.; Ahmed, S.
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    • Butenschoen, Mathias; He, Zhi-Guo; Kniehl, Bernd A.
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2019-03328