Recent results from Belle
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1 Recent results from Belle Chang-Zheng Yuan (IHEP, Beijing) (for the Belle collaboration) Hadron 15, Newport News Sept ,
2 The Belle experiment SCC RF(HER) Belle detector World record: L = 2.1 x /cm 2 /sec ARES(LER) 8 x 3.5 GeV 22 mrad crossing /fb Ares RF cavity e + source KEKB Mt. Tsukuba Belle The KEKB Collider 2 ~ 1 km in diameter
3 Ecm (GeV) N points Lum per point (fb -1 ) Physics analyses , h b, B (*) B (*) ~1 R b,, h b ~0.05 R b Continuum bkg. est. 3
4 e + e - annihilation of vector bottomonia } J PC = 1 -- (ns), Y b 4
5 ISR production of vector charmonia } J PC = 1 --,, Y 5
6 Outline R b measurement R b = σ(e+ e bb) σ 0 (e + e μ + μ ) e + e + (ns), + h b (np), B (*) B (*) (5S), (6S), Z b e + e + (ns), K + K J/ Y(4260), Y(4360), Y(4660), Z c & Z cs Summary 6
7 e + e - bb inclusive & exclusive Understand better the vector states above open bottom Study charged bottomoniumlike states 7
8 Previous results on Z b states Z b (10610) Z b (10650) M 1 -M B -M B* = MeV M 2 -M B* -M B* = MeV 8
9 R b = σ(e+ e bb) σ 0 (e + e μ + μ ) Procedure: 1. Count hadronic events 2. Subtract scaled cont. (udsc) 3. Subtract ISR (1S,2S,3S) 4. Do efficiency correction 5. Divided by lum & 0 ( ) No ISR corr.; no VP corr. Fit with constant width BW in small energy range. Need better model to fit Agree with BaBar:PRL102, (2009) with improved precision Ecm= GeV, 5 MeV step for >300 points, 3.9 fb -1 in total Belle: arxiv:
10 R b (5S): Mass = ( ) MeV Width = ( ) MeV (6S): Mass = ( ) MeV Width = ( ) MeV = rad Results agree with previous measurements Suffers from model uncertainties (signal, background parametrization, interference, thresholds, coupled channel effect) Belle: arxiv:
11 e + e + (ns) tag (ns) and select +, fit to A 5S +e i A 6S 2 (5S): Mass = ( ) MeV Width = ( ) MeV (6S): Mass = ( ) MeV Width = ( ) MeV + (1S) + (2S) = rad Results agree with previous measurements Also agree with fit with Rb reasonably well Still room for improvement Belle: arxiv: (3S)
12 Z b in (5S) + (ns) 121 fb -1 data, tag (ns) and select + + (1S) + (2S) + (3S) Belle: PRD91, (2015) 12
13 Z b in (5S) + (ns) Full partial wave analysis of (5S) + Mass, width, fraction, and JP=1+ of Z b states determined + (1S) + (2S) + (3S) Belle: PRD91, (2015) 13
14 Z b in (5S) + (ns) Relative BR of Z b decays Belle: PRD91, (2015) 14
15 e + e + h b (np) Reconstruct +, require + / recoil mass in Z b region: < M miss (π) < GeV/c 2 check the + recoil mass for h b (np) + h b (1P) + h b (2P) Belle: arxiv:
16 e + e + h b (np) (5S): Mass = ( ) MeV Width = ( ) MeV (6S): Mass = ( ) MeV Width = ( ) MeV = rad + h b (1P) + h b (2P) Resonant parameters agree with from e + e + (ns) e + e + h b (np) at the same level as e + e + (ns) 1 st obs. of (6S) + h b (np) Belle: arxiv:
17 Z b in (6S) + h b (np) Events mainly from Z b intermediate states not clear if only one Z b or both. Belle II will tell us. + h b (1P) + h b (2P) Belle: arxiv:
18 Z b in (5S) [B (*) B (*) ] + +c.c. BB = B 0 B + +c.c. One B is reconstructed BB* = B* 0 B + +c.c./ B 0 B* + +c.c. Select a bachelor ± B*B* = B* 0 B* + +c.c. B π e+ e- B* Check B recoil mass Belle preliminary 18 B decay modes combined B background 12263±168 B signals _ B*B* _ BB* _ BB B sidebands qq background B ( * ) B ( * ) π + BBγ 18
19 Z b in (5S) [B (*) B (*) ] + +c.c. Combine the B with a charged pion calculate recoil mass of B BB threshold RS data WS data Fit For Z b study! e+ B π e- B* signal MC BB* BB B*B* rm(bπ), GeV/c 2 N(BB ) = 13 ± 25 N(BB* ) = 357 ± 30 N(B*B* ) = 161 ± 21 Cross sections are not available yet! Belle preliminary 19
20 Z b in (5S) [B (*) B (*) ] + +c.c. Check recoil mass of bachelor π ± Belle preliminary BB* background Z b (10610) only Z b (10610) + NR Z b (10610) + Z b (10650) B*B* background Z b (10650) only rm(π), GeV/c 2 rm(π), GeV/c 2 Z b (10610) saturates BB*π and Z b (10650) saturates B*B*π BB*π B*B*π Assuming Z b decays are saturated by observed channels, B (*) B * channels dominate the Z b decays 20
21 The Y states PRL99, /fb PRL99, /fb PRL98, /fb PRL95, /fb Y(4008) Y(4260) Y(4360) Y(4660) Y(4630) PRL101, /fb Update with full Belle data M( c+ c- ) 21
22 e + e J/ from ISR PRL110, (2013) Still observed two resonances, Y(4008) and Y(4260), agrees with Belle s previous results. R 1 =Y(4008) R 2 =Y(4260) 1. Fit with two coherent resonances BW 1 +BW 2 *exp(i ) 2 +bkg. 2. Mass of Y(4008) is lower than before 3. Fit quality: c 2 /ndf=101/84, confidence level is 9.3% 22
23 e + e J/ from ISR PRL110, (2013) M 2 ( ) vs. M 2 ( J/ ) for 4.15<M( J/ ) <4.45 GeV (inset) Background events in J/ -mass sidebands Structures both in and J/ systems 689 events in J/ signal region, purity~80% 23 23
24 Z(3900) + observed in two experiments! Belle with ISR: PRL110, BESIII at GeV: PRL110, M = MeV = MeV events >5.2 M = MeV = MeV events >8 24
25 e + e (2S) via ISR ( J/ or ) + no extra tracks detection of ISR is not required 980 fb -1 Clear signal of missed massless particle (M rec2 ( )~0) Two significant clusters: Y(4360)+Y(4660); a few events at Y(4260) Polar angle distribution agrees well with ISR expectation Combinatorial background estimated by sidebands Bkgs from real ( ) non ISR or X non are negligibly small Belle: arxiv: , PRD91_
26 Fit with Two BWs Belle: arxiv: , PRD91_ J/ 26
27 Fit with Three BWs J/ + Belle: arxiv: , PRD91_
28 Fit with Three BWs J/ + Belle: arxiv: , PRD91_ Significance of Y(4260) is 2.4 Affect the parameters of Y(4360) and Y(4660) significantly! 28
29 Z c states from Y(4360) decays? J/ Belle: arxiv: , PRD91_
30 Z c (4050) arxiv: PRD91_ M(Z c ) = 4054 ± 3 ± 1 MeV/c 2 Γ = 45 ± 11 ± 6 MeV Significance: >3.5 An unbinned maximumlikelihood fit is performed on the distribution of M max (π ± ψ(2s)), the maximum of M(π + ψ(2s)) and M(π ψ(2s)), simultaneously with both modes. 30
31 No significant Z c in Y(4660) decays! J/ Belle: arxiv: , PRD91,
32 e + e - K + K - J/ via ISR Event selections are almost the same as in Phys. Rev. D 77, (R) (2008) Shaded hist.: J/ mass sidebands Y(4260) 980fb -1 +one resonance. Fit with (4415) c 2 /ndf=30/11 M= MeV = MeV 4-6 GeV: 213 events 35 bkg, signal 7.8% sys. error was not included. PRD 89,072015(2014) 32
33 Search for Z cs KJ/ states PRD 89, (2014) Large data samples at BelleII are needed to understand KJ/ and KKJ/ structures! No evident structure in K ± J/ mass distribution under current statistics 33
34 Summary With the world s largest data samples in bottomonium energy region Belle achieved a lot improved knowledge on (5S) and (6S) New results on the Z b states With ISR events, Belle studied charmoniumlike states Improved measurement of Y(4360) & Y(4660) Evidence for Z c (4050) but no Z cs yet Still lots of analyses on going, results soon Belle II is coming Thanks a lot! 34
35 The end 35
36 M( + - ) distributions Belle: arxiv: , PRD91_ J/ Y(4360) +f 0 (980) Y(4660) 36
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