Recent Bottomonium Results from Ba Bar Bryan Fulsom

Recent Bottomonium Results from Ba. Bar Bryan Fulsom SLAC National Accelerator Laboratory 35 th International Conference on High Energy Physics Paris, France July 22, 2010

Overview • Ba. Bar: 1999 -2008 • 122 M (3 S) / 100 M (2 S) • This talk: – (1 DJ) p+ p- (1 S) – (n. S) g(e+e-) hb(1 S) – (3 S) p+ p- hb(1 P) – (3 S) po hb(1 P) g hb(1 S) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 2/22

(1 DJ) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 3/22

(1 DJ): General Information • Expected (1 DJ=1, 2, 3) properties – m (1 DJ) ~10160 Me. V/c 2, m (1 DDJ) ~5 -12 Me. V/c 2, G (1 DJ) ~30 ke. V • Experimental observation – (3 S) gg (1 D 2? ) gggg (1 S) ggggl+l– B( (3 S) ggggl+l-) = (2. 5 ± 0. 5) 10 -5 – m (1 D 2? ) = 10161. 1 ± 0. 6 ± 1. 6 Me. V/c 2 • No evidence for (1 DJ) p+p- (1 S) – Limit: B( (1 DJ) p+p- (1 S)) < 4% – Theory: Kuang & Yan ~40%, Ko ~2%, Moxhay ~0. 25% Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 4/22

(1 DJ): Ba. Bar Analysis • Reconstruct (3 S) gg (1 DJ) ggp+p- (1 S) ggp+p-l+l– – Require exactly 4 tracks ml+l- consistent with / constrained to m (1 S) Minimize Eg 2 to select best candidate m (1 DJ) resolution ~ 3 Me. V/c 2 • Maximum Likelihood fit to mp+p-l+l- spectrum – (1 DJ) signals: Double Gaussian + Crystal Ball – Monte Carlo (MC)-determined backgrounds: • (3 S) g b. J(2 P) gw (p+p- or p+p-po) (1 S) • (3 S) p+p- (1 S) + g. FSR • (3 S) h (p+p-po) (1 S) • (3 S) gg/popo (2 S) (p+p- (1 S)) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 5/22

(1 DJ): Fit Results m (1 D 2) = 10164. 5 ± 0. 8 ± 0. 6 Me. V/c 2 Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 6/22

(1 DJ): Quantum Numbers – L: p+p- invariant mass • P( 2) for mp+p- distribution • D(84. 6%), S(3. 1%), P(0. 3%) – J: p Helicity Angle • d. N/d(cosqp) ~ 1 + (3 cos 2 qp-1)/2 • = -1. 0± 0. 4± 0. 1 consistent w. J = 2 – JP: Angle between p+p- and l+l- planes • d. N/d ~ 1 + cos(2 ), sign( ) = (-1)JP • = -0. 4± 0. 3± 0. 1 consistent w. JP = 2 Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 7/22

hb(1 S) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 8/22

hb(1 S): General Information • hb(1 S) observed in inclusive g spectrum for (3 S) and (2 S) • Measured properties – B( (3, 2 S) ghb(1 S)) = (5. 1 ± 0. 7) 10 -4 / (3. 9 ± 1. 5) 10 -4 – mhb(1 S) = 9390. 9 ± 2. 8 Me. V/c 2, Ghb(1 S) 10 Me. V – (m (1 S) – mhb(1 S)) = 69. 3 ± 2. 8 Me. V/c 2 • Hyperfine splitting theoretical predictions – Lattice: ~50 -60 Me. V/c 2 NRQCD: ~40 Me. V/c 2 Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 9/22

hb(1 S): Converted Photon Analysis • Converted photons (g e+e-) improve resolution (25 5 Me. V) – Fit pair of tracks, selected with 2 fitter, mg, rg – Additional cuts: |cosqthrust|, Ntracks, po veto • Simultaneous fit to Eg spectrum in (3 S) and (2 S) datasets – (3, 2 S) g hb(1 S): Breit-Wigner Crystal Ball – e+ e-E=m (n. S) g. ISR (1 S): Crystal Ball – b. J(2, 1 P) g (1 S): Doppler broadening Crystal Ball – Background: 4 th order polynomial exponential decay Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 10/22

hb(1 S): Fit Results Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 11/22

$g e+e-: Results Summary • Eg and branching fractions as expected • Mass-constrained fit:$

g e+e-: Results Summary • Eg and branching fractions as expected • Mass-constrained fit: – No evidence for hb (2. 3 s stat. ) • Best fit result in mhb(1 S) region: – Differs by +12. 4+3. 8 -4. 0 Me. V/c 2 (3. 3 s stat. , 2. 6 s w. syst. ) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 12/22

hb(1 P) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 13/22

hb(1 P): General Information • Expect mhb(1 P) = (m b 0(1 P)+3 m b 1(1 P)+5 m b 2(1 P)) / 9 9900 Me. V/c 2 • Production mechanisms – B( (3 S) p+p- hb(1 P)) ~ 10 -3 – 10 -2 – B( (3 S) po hb(1 P)) ~ 10 -3 – R(pohb (1 P) / p+p-hb (1 P)) = 0. 05 – 20 • Expected decays – hb(1 P) ggg (57%), ghb(1 S) (41%), ggg (2%) • Previous searches – B( (3 S) p+p- hb(1 P)) < 1. 8 10 -3 – B( (3 S) po hb(1 P)) < 2. 8 10 -3 Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 14/22

p+p-hb(1 P): Analysis Strategy • Reconstruct pair of oppositely charged tracks – Cuts on Etotal, R 2, Ntracks, KSo veto (flight length, cos a) • Define p+p- recoil mass: m. R 2 = (m (3 S) – E p+p-)2 – P p+p-2 • 2 fit to m. R with 7 components – hb signal: Symmetric two-sided Crystal Ball (TCB) – (3 S) p+p- (2 S): Asymmetric TCB + Bifurcated Gaussian – (2 S) p+p- (1 S): same, with fixed feed-down components – b 1, 2(2 P) p+p- b 1, 2(1 P): TCB, with fixed peak position – KSo p+p-: MC-determined phase space – Non-peaking background: 6 th order Chebychev polynomial Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 15/22

p+p-hb(1 P): Fit Results Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 16/22

p+p-hb(1 P): Fit Results Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 17/22

p+p-hb(1 P): Fit Results • No evidence for hb signal at mhb = 9900 Me. V/c 2 – B( (3 S) p+p- hb(1 P)) = (0. 0 ± 0. 5 ± 0. 3) 10 -4 (<1 10 -4 UL) • Most significant scan point <2 s significance • Exclude B( (3 S) p+p-hb(1 P)) > 2. 5 10 -4 (90% CL) over range Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 18/22

pohb(1 P): Analysis Strategy • Reconstruct po(g 1 g 2) + g – Require Eg consistent with hb(1 P) ghb(1 S) – Cuts on Ntracks, R 2, po veto (all g candidates), po cosqh • Define po missing mass: m. m. (po)2 = (m (3 S) – E po)2 – P po 2 – Constrain mpo to improve resolution – Npo from mg 1 g 2 fit in each m. m. (po) bin • 2 fit of m. m. (po) distribution – hb(1 P) signal: Double Crystal Ball – Background: 6 th order polynomial, from reweighted MC Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 19/22

pohb(1 P): Fit Results Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 20/22

pohb(1 P): Fit Results • Fixed mass fit: – B( (3 S) po hb(1 P) poghb(1 S)) = (3. 1± 1. 1± 0. 4) 10 -4 (2. 7 s) – 1. 5 10 -4 < B( (3 S) po hb(1 P) poghb(1 S)) < 4. 9 10 -4 • Best fit mhb = 9903 ± 4 ± 1 Me. V/c 2 consistent with predictions • Combined results: – R(pohb(1 P) / p+p-hb(1 P)) > 3. 2 (>1. 5 for mhb = 9903 Me. V/c 2) Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 21/22

Summary • (1 DJ) p+p- (1 S) – First observation of (1 DJ) hadronic decays – Quantum numbers and precise m (1 D 2) measurement • (2, 3 S) converted photon spectrum – Most significant (2. 6 s) “hb” signal at 9403. 3± 2. 4+0. 9 -1. 5 Me. V/c 2 – Improved and first direct b. J(1, 2 P) g (1 S) measurement • hb(1 P) Search – No evidence for (3 S) p+p- hb(1 P) – Marginal evidence (2. 7 s) for (3 S) pohb(1 P) poghb(1 S) – B( (3 S) pohb(1 P)) / B( (3 S) p+p-hb(1 P)) > 1 at 90% C. L. Recent Bottomonium Results from Ba. Bar / Bryan Fulsom / ICHEP / 2010. 07. 22 / Page 22/22

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