Spectroscopy and New Resonances at Belle B. GolobUniversity of Ljubljana, Slovenia Belle CollaborationB. Golob, Belle Lake Louise Winter Inst., 2006 Experimental environment X(3872) quant. numbers gg Z(3930) - cc2 Y(3940) X(3940) Summary

Experimental environmentB. Golob, Belle Lake Louise Winter Inst., 20068 GeVe-3.5 GeV e+KEKB asymmetric B factory(4s)e+e-Bavailable datae+e-g*u,d,s,cBelle

X(3872)Observed by BelleB K p+p-J/y152M BB,PRL91,262001(2003)B. Golob, Belle Lake Louise Winter Inst., 2006Br(BXK) Br(X p+p-J/y) =(1.310.240.13)x10-5B K g J/yB K cc1(gJ/y) calibration mode,p0 vetono. of Bs in bins of M(gJ/y)13.64.4 evts.(4s)C(X(3872))=+1M=3872 MeV/c2s=13 MeV/c2charmonium, DD*, tetraquarks...?world average:M=3871.90.5 MeV/c2M(p+p-l+l-)-M(l+l-)X(3872)E.S.Swanson,PLB588,189(2004)L.Maiani et al.,PRD71,014028(2005)y

X(3872)B. Golob, Belle Lake Louise Winter Inst., 2006angular distributionsin B K X(p+p-J/y)examples:|cosq|side bandc2/nof=31/9X J/y r, S-waveexpectedJPC=0++c2/nof=5/9 X g J/y ang. distrib. M(p+p-) in X p+p-J/y

disfavor all ofJ=0,1,2 cc states

except

1++, 2++

X D0D0p0 ??

1++ DD* S-wave2++ DD* D-wave,suppressed by (q*)2L+1

preliminaryX(3872)B. Golob, Belle Lake Louise Winter Inst., 2006Br(BK X)Br(XDD)=(1.60.40.3)10-4

BKD0D0p0/KD0D*0

M(D0D0p0) inB signal regionM(D0D0p0) M(X)Br(XDD)/Br(X p+p-J/y) =125

hard to accomodate with a 2++ stateJPC(X(3872))=1++

Z(3930)B. Golob, Belle Lake Louise Winter Inst., 2006395fb-1,hep-ex/0512035acc. to PRLacceptancecorrectedD side bandJ=2 expect.c2/nof=1.9/9J=0 expect.c2/nof=23.4/95.3sq*: D, beam axisin gg frameS.Godfrey,N.Isgur,PRD32,189(1985)C.R.Mnz,Nucl.Phys.A609,364(1996)

B. Golob, Belle Lake Louise Winter Inst., 2006M2(J/y w)M2(Kw)Dalitz plot for B K w J/yB K* J/y; K* K w resonantstructure?M(Y)=39431113 MeV G=872226 MeV 58 11 evts. >8sY(3940)No. of Bsin bins of M(wJ/y)

M(J/y w)Br(BYK)Br(YwJ/y)=(7.11.33.1) x10-5radially excited P-wave cc?large Br(YwJ/y)

cc-gluon hybrid?suppressed D(*)D(*) decayspredicted M4.3 GeVF.E.Close,P.R.Page,Nucl.Phys.B443,233(1995)C.Banner et al.,PRD56,7039(1997)

ReconstructJ/y l+l-recoil mass (mass of X):X(3940)B. Golob, Belle Lake Louise Winter Inst., 2006357fb-1,hep-ex/0507019subm. to PRL26663 evtsM~3936 MeV/c2s(Mrec)~30 MeV/c25sMrec(J/y D)=M(D)Mrec(J/y D)=M(D*)M=394366 MeV/c2G

X(3940)B. Golob, Belle Lake Louise Winter Inst., 2006357fb-1,hep-ex/0507019subm. to PRLno evidence forX(3940)J/y w X(3940)Y(3940)several speculations on X(3940) nature, all pros and cons;further experimental study (ang. distrib.)

Summary KEKB is also a great source of charm & cc states Some expected, many unexpected/puzzling observations/discoveriesunderstandingrange of questions:what arethey?anomalousproperties?all propertiesas expected?DsJX(3872) Y(3940)X(3940)Sc(2800)broad D**PQB. Golob, Belle Lake Louise Winter Inst., 2006cc2existence?

new stateproductiondecay modeto establishnextreferenceX(3872)BKXp+p-J/yp+p-p0(w)J/yg J/yquantum num., decay modeshep-ex/0408116hep-ex/0505038hep-ex/0505037cc2ggDDquantum num.hep-ex/0512035Y(3940)BKYw J/ydecay modesPRL94,182002(2005)X(3940)continuum,cc recoilMrecoil,DD*quantum num.hep-ex/0507019broad D**BD**p+D(*)pBrsPRD69,112002hep-ex/0412072Sc(2800)continuumLcp+s,G (mixing)PRL94,122002(2005)DsJcontinuumBDDsJ, BDsJKDsp0, Ds*p0, DsgBrsBELLE-CONF-0461hep-ex/0507064hc(2s)continuum,cc recoilMrecoilsPRD(R)70,071102

+(1540)sec. int. pKpKSexistence?PLB632,173(2005)Q+,Q*++,Qc0, Qc*+B decayspKS,pK+,D(*)-p,D0pexistence?hep-ex/0411005