Theoretical investigations on the Y(4260) being an hybrid meson
The new recently experiments at the B-factories yield a renewed interest in the charm and charmonium spectroscopy. New intriguing states have been observed, which appear to be non-conventional mesons, such as X(3862) and Y(4260) and request more theoretica
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002 ceD 8 3v3811160/hp-pe:hviXraTheoreticalinvestigationsontheY(4260)being
anhybridmeson.
F.Iddir andL.Semlala
LaboratoiredePhysiqueTh´eorique,Universit´ed’OranEs-S´enia,31100,ALGERIA
February2,2008
Abstract
ThenewrecentlyexperimentsattheB-factoriesyieldarenewedin-terestinthecharmandcharmoniumspectroscopy.Newintriguingstates
havebeenobserved,whichappeartobenon-conventionalmesons,suchasX(3862)andY(4260)andrequestmoretheoreticalinvestigations.
WewillexplorethepossibilityfortheY(4260)tobeaccghybridwithconventionalc
D
channels.Thenmoreexperimentalstudiesareneededtocon rmtheexistenceofthisresonanceandtogiveitsproperties.
1Introduction
Inthelastfewyears,anintenseactivityhasbeendoneattheB-factories,andhasseenimportantprogressofcharmandcharmoniumspectroscopy.Newcharmmesonsandbaryonshavebeenobserved,andmainlycharmonium-likemesonsthatneedparticularattention,sincetheydonotclassifyinthestan-dardhadronicspectroscopy(bythenaivequarkmodel).ThemoreinterestingobservednewstatesaretheX(3872)andtheY(4260). TheX(3872)
D 0threshold
(3871.3±1.0MeV)[5].Otherdecaymodeshavebeenobserved:
i)inγJ/ψ[6]withabranchingrationof(19±7)%relativetotheX(3872) →π+π J/ψmode,
semlala@yahoo.fr
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