the nature of x(3900) and recognition of open charm effects
DESCRIPTION
The nature of X(3900) and recognition of open charm effects. Qian Wang IHEP, CAS. In collaboration with Gang Li, Xiao-Hai Liu and Qiang Zhao. Outline. Motivation Methods and results Other implications of open charm scenario Summary. Motivation. Conventional hadrons. Meson. Baryon. - PowerPoint PPT PresentationTRANSCRIPT
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The nature of X(3900) The nature of X(3900) and recognition of open and recognition of open
charm effectscharm effects
Qian WangQian Wang
IHEP, CASIHEP, CAS
In collaboration with Gang Li, Xiao-Hai Liu and Qiang ZhaoIn collaboration with Gang Li, Xiao-Hai Liu and Qiang Zhao
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OutlineOutline
• Motivation• Methods and results• Other implications of open charm
scenario• Summary
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MotivationMotivation
• Conventional hadrons
Meson Baryon
Multi-faces of QCD:Exotic hadrons beyond conventional Quark ModelHybrid Hadronic molecule Tetra-quarkGlueball
The study of hadron structures and hadron spectroscopy should deepen our insights into the Nature of strong QCD.
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MotivationMotivationCharmonium spectrum
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Heavy quarkonium: progress, puzzle and opportunities. Heavy quarkonium: progress, puzzle and opportunities. Eur. .Phys.J C71, Eur. .Phys.J C71, 1534(2011)1534(2011)
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MotivationMotivation
Belle Collaboration,
Phys. Rev., D77(2008)011103
What is X(3900)?
Open charm effects in the cross section.
Yuan-Jiang Zhang and Qiang Zhao,
Phys.Rev., D81(2010)034011Whether the same mechanism plays a role in other processes? Is there direct evidence to establish it as a dynamical mechanism?
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Methods and resultsMethods and results
Qian Wang etc, hep-ph/ 1202.3026
Xiao-Hai Liu etc,
Phys. Rev., D81(2010)014017
Yuan-Jiang Zhang etc,
Phys.Rev.Lett., 17(2009)172001
mixing, Talk by Xiao-Gang Wu
The mass shift in charmonium, E.Eichten etc., Phys.Rev., D17(1987)3090
Gang Li and Qiang Zhao, Phys.Rev.D84(2011)074005
Feng-Kun Guo and Ulf-G Meissner, Phys.Rev.Lett., 108(2012)112002
Feng-Kun Guo etc., Phys.Rev., D83(2011)034013
The hadron loop model or the coupled channel effect
……
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Methods and resultsMethods and resultsLong-range processes in
Qian Wang, Xiao-Hai Liu and Qiang Zhao, Phys.Rev., D84(2011) 014007
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Methods and resultsMethods and results
Qian Wang, Xiao-Hai Liu and Qiang Zhao, Phys.Rev., D84(2011) 014007
The effective Lagrangians for charmonium coupling to charmed mesons and light meson coupling to charmed mesons are extracted from heavy quark symmetry and chiral symmetry.Xiao-Hai Liu etc., PRD81(2010)014017, H.Y.Cheng etc., PRD71(2005)014030
R.Casalbuoni etc., PR281(1997)145
Taking into account the off-shell effect of the exchanged charmed meson between the final mesons, we include the dipole form factor
.
VMD gives the form of virtual photon coupling to vector meson
The effective coupling can be extracted from the width of vector to lepton pair.
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Methods and resultsMethods and results
For the isospin-violating J/0 production:
(b)(a)
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Methods and resultsMethods and resultsCross section lineshape of
The parameter is determined by this cross section.
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Methods and resultsMethods and resultsDirect evidence for open charm effects in the cross section lineshape of
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Methods and resultsMethods and resultsPossible further evidence for open charm effects in the cross section lineshape of
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Other implications of open charm Other implications of open charm scenarioscenario
The long-standing puzzle:
Color-octet model, Y.Q. Chen and E.Braaten, Phys.Rev.Lett.80(1998) 5060
Vector meson mixing, L.J.Glavelli etc., Phys.Rev.,D28(1983)2767, S.S. Pinsky, Phys.Lett., B236(1990)479
Final-state interactions,X.Q. Li etc., Phys.Rev., D55,(1997)1421, M.Suzuki.,Phys.Rev.D57(1998)5717
Vector glueball near J/Ψ,C.T. Chan etc., Nucl.Phys., A675(2000367C, Y.F.Gu etc., Nucl.Phys., A675(2000)4040C
Intrinsic charm in light mesons,S.J.Brodsky etc., Phys.Rev.Lett.78(19997)4682
Light-quark mixing effects,T.Feldmann and P.Kroll, Phys.Rev.,D62(2000)074006
Interferences between the electromagnetic and strong interactions ……
This is our starting point.
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Other implications of open charm Other implications of open charm scenarioscenario
A.Seiden etc., PRD38(1988)824, M.Suzuki, PRD63(2001)054021,
Gang Li etc., J.Phys.G35(2008)055002, Qiang Zhao etc., PLB645(2007)173
Overall fit indicates the suppression of strong interaction in Ψ’ decays.
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Other implications of open charm Other implications of open charm scenarioscenario
Qian Wang, Gang Li and Qiang Zhao, Phys. Rev. D85, 074015.
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Other implications of open charm Other implications of open charm scenarioscenario
Qian Wang, Gang Li and Qiang Zhao, Phys. Rev. D85, 074015.
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SummarySummary
• X(3900) may be due to open charm effects instead of a new charmonium state.
• Such a mechanism can be directly examined in
• Open charm effects could be essential for understanding the long-standing “ puzzle”.Thank you for your
attention!