p Comparison the B differential cross section between

p. Comparison the B differential cross section between theoretic calculation and our measurement to test our analysis. p. Refit the mass spectrum. Mar. 3, 2008 B Physics 1

Theoretic cross section Mar. 3, 2008 B Physics 2

Our measurement: efficiency • eff. Trigg is the eff. Of jpsi trigger path, including the geometry acceptance. • B rec. eff. Is the eff. Of our selection criteria for samples that passed the jpsi HLT path. I will compare two treatments in the following. Mar. 3, 2008 B Physics 3

Trigger efficiency in diff. B Pt bin Eff(trig) = N(B, passed HLT sample)(i)/ N(B, before HLT sample)(i) i=bin 1, 2, 3, 4, 5 Mar. 3, 2008 B Physics 4

B rec. efficiency in diff. B Pt bin 1>Eff(B rec) = N(B, we selected after fitting)/ N(B, after HLT, MC truth), all bins are same: 3168/9050=35% 2>Eff(B rec) = N(B, selected after fitting)(i)/ N(B, after HLT)(i) i=bin 1, 2, 3, 4, 5 Error is not correct here! Mar. 3, 2008 B Physics 5

Our measurement and comparison 1> Mar. 3, 2008 2> B Physics 6

Our measurement and comparison: conclusion p B meson rec. efficiency is p. T(B) dependent; p. We repeat theoretical cross section in high p. T(B) region using our eff. Measurement. p. To measure diff. cross section of low p. T region is dangerous. (eff. is difficult to be correct). Binning method? CDFII p. T(B)>6 Ge. V Mar. 3, 2008 B Physics 7

Refit the mass spectrum 35<Bp. T Old fit New fit Incorrect! Mar. 3, 2008 B Physics 8

Mar. 3, 2008 B Physics 9