Evidence for B hcK - UHM Physics and Astronomy

Evidence for B hcK - UHM Physics and Astronomy

Evidence for the c Sookyung Choi Gyeongsang University & Stephen L. Olsen University of Hawaii Expected mass of the c 3 cc level diagram: =??? c

=117 MeV c ?? Dc1 Dc2 3 Dc3 3 h1 ?

1 c0,1,2 J/ potential model: s ( M ) M 2 ' ee 45 ~ 65MeV 2 s ( M J / ) M J / J / ee expect M(c) 3.62~3.64 GeV close to

Expected widths/decay modes Similar to c narrow (but not like the J/) 10< < 20~30 MeV ~same decay channels Br ( B Kc ' ) Br ( B K ' ) 0.7 Br ( B Kc ) Br ( B KJ / ) Search in a channel with strong c signal but absent in decays Search in cKSK channel

Br(cK0K) is respectable (2%)) all charged particles ((E) 13 MeV) low combinatoric background no background (Br(K0K)<104 Br(K0K)5.2 GeV; |E|<0.2 GeV

|costhrust| < 0.9 between B and rest of evnt all candidate tracks constrained to IP Charged kaon selection K/id: atcpid(3,1,5)>0.6 p/Kid: atcpid(3,1,5)<0.95 veto: _likelihood < 0.9 e veto: eid_prob(3,-1,5)<0.9 CDC hits: Nax8 ; Nster3 vertex : r<0.3 ; |z|<2.2

Charged pion selection K/id: atcpid(3,1,5)<0.4 p/id: atcpid(3,1,5)<0.9 e veto: eid_prob(3,-1,5)<0.95 CDC hits: Nax8 ; Nster3 vertex : r<0.3 ; |z|<2.2 KS selection

flight-length > 0.3 || <0.2 |M MKs|< 12 MeV if both trks have SVD hits: Zdist<1.2 otherwise: Zdist<10 ; r>0.015 ; ||<0.1 continuum-bkgd suppression Fisher 5 SFW moments costhrust pt |particles with thrust>60o cosB B candidate production angle

L = PDF( fisher ) x PDF(cosB) Fisher SFW costhrust major minor use: R maj 2,4 & R 2,3,4 pt| PDF ( fisher ) i SFWi cos T | pt | 1, 5 Likelihood Ratio

Fisher cosB cut LR = Lsig/(Lsig+ Lqq) K* and charm veto 0 10 suppressed by an angular c momentum barrier backgrounds commonly have K*s veto events with K*: |MK M K* |>50 MeV also veto events with charm:

|MK M D |>10 MeV |MKKs M Ds |>10 MeV Look at K KsK combinations Select events in the E Mbc signal box M(KSK) for signal-box evts (B+ K KS K + B0KS KSKcombined) 1.5-entries/evnt 100 evts 28 evts 2-entries/evnt

38 evts ? c properties M = 3653 9 MeV = 30 +44 -?? MeV = 3.8

NB: N(S

16 5 evts 4 4 evts Slice fit results M(KsK Nevts 3.55 5.8 4.0 0 3.60

12.74.4 ~3 3.65 26.06.1 5.2 3.70 16.55.4 ~3 3.75 4.44.1 BW with M =3653 & = 30 MeV; not a fit!

~ Poor agreement maybe due to the coarseness (50MeV) of the slice-fit bins Summary We observe a 5.2 signal for BK KSKnear 3650 MeV. This cannot be the Most likely this is BKc with: 3625

This disagrees with the Crystal-Ball result Mc=35945 MeV but agrees with potential models. Mbc

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