BES-Belle-CLEO-BaBar WS Z(4430) CLEO BES BES-Belle-CLEO-BaBar WS BaBar S.L. Olsen U of Hawaii & 高能所 北京 Belle

S.Olsen cheap!! (美元) 性感! mesons mesons 笨手笨脚

1st: The Z(4430)

Study BKp+y’ y’  ℓ+ℓ- tight PID cuts (both leptons) Use 548 fb-1 y’  ℓ+ℓ- tight PID cuts (both leptons) |Mℓℓ – M y’|<20 MeV y’ p+p-J/y: Mp+p->0.45 GeV; |Mp+p-l+l- -Ml+l- - 0.589GeV| < 0.076 GeV (2.5s) KID > 0.5=K <0.5 = p; Belle Std (Fang Fang) KS R2<0.4; |cosqB| < 0.9 |Mbc – 5.28|<0.0071 GeV (2.5s) |DE|<0.031 GeV (2.5s)

Constrain tracks to MB sM(py’) = 2.5 MeV for both modes After the constraint: sM (y’  l+l-)  4.4 MeV cut @ 2.5s sM (J/y  l+l-)  5.3 MeV Use: M(py’) = M(pl+l-) – M(l+l-) + my’(PDG)’ y’  l+l- mode y’  p+p- J/y M(py’) = M(p ppJ/y) – M(ppJ/y) + my’(PDG) sM(py’) = 2.5 MeV for both modes M(py’) resolution is not an issue

Dalitz Plot, Selected events What’s this?? M2(p+y’) K2*(1430)K+p- (dble-lobed D-wave?) K*(890)K+p- M2(K+p-)

Dalitz Plot, M(K+y’) vs M(K+p)

M(Kp) K*(890) = 1742  59 evts K2*(1430) = 103  36 evts N(“phase-space”) = 1112 ± 63 evts Cut out K*(890) & K*(1430) ± 100 MeV

M(p+ y’) (with K* veto) Strong narrow signal; very little bkgd DE sideband bkg (consistent with Mbc & DE fitting Mpeak±30MeV

Fit peak to an S-wave BW Belle Phase-space-like function for 0708.1790 PRL Phase-space-like function for bkg+continuum

Compare data subsamples Significant signals @ ~4433 MeV in all subsets

M(py’) & cosqp are very tightly correlated Cos qp vs M2(py’) p qp y’ K +1.0 22 GeV2 (4.43)2GeV2 0.25 M2(py’) cosqp 16 GeV2 -1.0 M(py’) & cosqp are very tightly correlated

Interference between Kp partial waves? Only S-, P- and D-waves seen in data interfere Add incoherently

Can we make a peak at cosqp≈0.25 with only S-, P- & D-waves? Not without introducing other, even more dramatic features at other cosqp (&,, other Mpy’) values.

Other “latest” XYZ results

1-- states via ISR

Y(4260) & Y(4325) from BaBar p+p-J/y Not the same! p+p-y’ 233 fb-1 BaBar PRL95, 142001 (2005) fitted values: M=4259  8 +2 MeV G = 88  23 +6 MeV -6 -9 p+p-J/y Not the same! M=4324  24 MeV G = 172  33 MeV BaBar PRL 98 252001 (2007) p+p-y’ S.W.Ye QWG-2006 June 2006

Belle results on the 1-- peaks BaBar’s Y(4260) p+p- J/y Belle Yuan et al PRL99,182004 Y(4050)??? BaBar’s Y(4325) Y(4360) & Y(4660) p+p- y’ Belle Wang et al PRL99,142002 K+K- J/y Belle Yuan et al 0709.2565

stot DD D*D* This means large partial widths for p+p- J/y (y’) DD* These 1-- states do not match well to peaks in hadr. cross-sections Y(4360) Y(4660) Y(4008) DD D*D* This means large partial widths for p+p- J/y (y’) (~few MeV or more) DD* Y(4260) Pakhlova (Belle) PRL 98, 092001 (2007)

No unfilled charmonium assignments are available Are these 1-- cc states？ 4660 4360 No unfilled charmonium assignments are available (except, maybe, Y(4050)) 4260 4050

Y(3940) confirmed by BaBar B±K±wJ/y B±K±wJ/y B0KSwJ/y ratio BaBar 0711.2047 B±K±wJ/y B±K±wJ/y B0KSwJ/y M2(Kw) ratio M(wJ/y) Some discrepancy in M & G; general features agree

Belle & BaBar data with the same binning 3915 data disagree In this region BaBar Belle rebin PRL94, 182002 (2005) (40 MeV bins)

M(D*D*)a new state at ~4160 MeV Seen in e+e-J/yD*D* (partial reconstruction) D*-reconstructed + D*-tag Paklov’s talk tomorrow 5.5  M = 4156 +25 ± 15 MeV Gtot = 139 +111 ± 21MeV Nsig =24 +12 ± 11evts -20 -61 -8 arXiv:0708.3812 if 0++, why is it not seen in DD It has to have C=+; most likely 0-+,... possibly 0++

A cc assignment for X(4160) ? hc” hc’’’ Mass is too high or too low (if y(3S)=y(4040)) or too low (if y(3S) = y(4160)) hc” 4160 3940 Mass is far too low (unless y(4S)=y(4160), but, then, where is y(2D?)) 3931 hc’’’ Can place either the X(3940) or X(4160), but probably not both.

Some Comments There seems to be a new hadron spectroscopy in the M=3.5~5 GeV region Maybe more than one Bodes well for BESIII, Super-B factories & PANDA Some states are narrow even though they are far above decay thresholds e.g. Y(4660)ppy’ & Z+(4430)p+ y’ have large Q but G≈50 MeV They are characterized by large partial widths (Bfs) to hadrons+J/y (or y’) Br(X(3872)rJ/y) > 4.3% (Isospin=1) G(Y(3940)wJ/y) > 7 MeV (SU(3) octet) G(Y(4260)p+p-J/y) > 1.6 MeV States that decay to y’ not seen decaying to J/y (and vice-versa) Bf(Y(4660)ppy’) >> Bf(Y(4660)ppJ/y)  same for Y(4360) & Z(4430py’ Y(4260) not seen in Y(4260)ppy’ The new 1-- states are not apparent in the e+e-D(*)D(*) cross sections There is no evident transitions at the D**D mass threshold Some states are near thresholds, but not all of them

some of the states are near thresholds, DD thresholds DSDS thresholds some of the states are near thresholds, but this is not a universal feature

Are there XYZ counterparts for the ss- & bb- systems?

Belle: G((5S)pp(nS)) is Huge!!! (4S)pp(1S) 477 fb-1 from Belle (1/20 times the data & ~1/10th the crosssection) 8 times as many events! 2S 3S 4S (4S)  (1S) p+p- “(5S)”pp(1S) 23.6 fb-1 from Belle 325±20 evts! 44±8 evts Belle 0710.2577

PDG value taken for (nS) properties Partial Widths Assume “(5S)” = (5S) PDG value taken for (nS) properties N.B. Resonance cross section 0.302 ± 0.015 nb at 10.87 GeV PRD 98, 052001 (2007) [Belle] >100 times bigger!! Cf (2S)  (1S) p+p- ~ 6 keV (3S) 0.9 keV (4S) 1.8 keV

If there are bb versions of the XYZ’s, why not ss versions as well? It looks like there is a bb version of the Y(4260) lurking around the (5S) If there are bb versions of the XYZ’s, why not ss versions as well?

1-- Ys states around 2 GeV? X.Y. Shen’s talk @ Ecm ~10.6 GeV Y(2175)f0(980)f from BaBar (confirmed by BESII) e+e-  g f0(980)h @ Ecm ~10.6 GeV confirmed by BESII M(f0(980)f GeV X.Y. Shen’s talk

Luciano Maiani @ had-2007

Now it looks like there may be XYZ-like spectroscopies for the s- & b-quark sectors

Lots of pieces Are they all from the same puzzle? Y(3940) Z(4430) X(3940) Are they all from the same puzzle? X(4160) Y(4660) Y(4050) Y(4260) Y(4360) X(3872)

謝謝

Product Bf calculation Only use K± From PDG

Summary - 7.3s p+y’ inv mass peak in BKpy’ decays - signif. signals seen in all data sub-samples - no produced by interference effects in Kp system JP=1+ slightly preferred (over 0- & 1-) - similar M & G to ppy’ peaks found by X.Wang et al - if it is a meson, it’s exotic

Backup slides

Comments on the Z+(4430) Not a reflection from the Kp system ~ No significant signal in B KpJ/y It has non-zero charge  not cc or hybrid Mass, width & decay pattern similar to Y(4360) & Y(4660)

G for y’p+p-J/y vs G for y’l+l- Nsignal = 53  15 evts Mass = 4435  4 MeV FWHM G = 26+13-8MeV Signif = 4.5 s y’l+l- Nsignal = 105  35 evts Mass = 4435  10 MeV FWHM G = 94+42-30MeV Signif = 4.7 s

Width comparison c2 = + = 4.8/1dof (94 – 45)2 (45-26)2 302 132 From the combined fit (94 – 45)2 (45-26)2 302 132 c2 = + = 4.8/1dof ~3% probability

Ratio of signal yields ppJ/y mode: 53 ± 15 from fit: = 0.5 ± 0.2 l+l- mode 105 ± 35 from fit: = 0.5 ± 0.2 MC expt’n: 1.23 Yield & width are correlated. Refit forcing both samples to have G=44MeV ppJ/y mode: 64 ± 15 l+l- mode: 59 ± 13 Constrained fit: = 1.1 ± 0.4 OK

M(Kp) in peak region K* veto relaxed

Systematic errors * Mass very small (~1 MeV) - y’ppJ/y - y’l+l- - J/y l+l- * Prod Bf - correl with G 25% - diff fitting fcns 7% - diff JP values 6% - PDG Bf’s 4% - other ~2% width very large +30/-11 MeV ?? - avg fluctuations in data subsamples 27%

XYZ states have large pp(w)J/y (y’) partial widths G(Y(3940)  wJ/y) ~ 7 MeV G(Y(4260) p+p-J/y) > 1.5 MeV G(Z+(4430)p+y’) > 4 MeV … As compared to charmonium: G(y’p+p-J/y) ~ 100 keV G(y’hJ/y) ~ 10 keV G(y’’p+p-J/y) ~ 50 keV

Belle updates e+e-J/yD(*)D(*) Use “partial reconstruction technique” Continuum e+e- annihilation J/y e+ e- reconstruct these D(*) D(*) “Recoil” D(*) undetected (inferred from kinematics)