Exclusive |Vcb| at Belle

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Presentation transcript:

Exclusive |Vcb| at Belle Christoph Schwanda Institute of High Energy Physics Austrian Academy of Sciences 9th International Workshop on the CKM Unitarity Triangle (CKM 2016) Nov 28-Dec 2, 2016, TIFR Mumbai, India

New ! Outline of this talk Belle B0 ® D*-l+n with hadronic tag (CKM 2016 preliminary) BELLE-CONF-1612 Belle B ® Dl+n with hadronic tag Phys. Rev. D93, 032006 (2016) HFAG summer 2016 averages New !

B ® D(*)ln decay width B ® D*ln B ® Dln

Form factor parameterizations Caprini, Lellouch, Neubert [Nucl.Phys. B530, 153(1998)] Boyd, Grinstein, Lebed [Phys. Rev. Lett. 74, 4603 (1995)] B ® D*ln B ® Dln Parameters: F(1), r2, R1(1), R2(1) G(1), r2 Parameters: coefficients ai,n

Belle B0 ® D*-l+n with hadronic tag BELLE-CONF-1612 (preliminary)

Event reconstruction and inclusive fit Tag side: Btag reconstructed in over 1100 hadronic modes, 0.2% efficiency for neutral B mesons Signal side: Bsig assembled from an identified charged lepton (electron or muon) and a D*+ candidate D0 ® K-p+, K-p+p0, K-p+p-p+ (26.3%), D+ ® K-p+p+ (9.4)% D*+ ® D0p+, D+p0 (98.4%) Signal is extracted from the missing mass distribution by an unbinned maximum likelihood fit Preliminary! Largest syst: tag calibration

Differential fit result Preliminary! Yield is also extracted in 4x10 bins of w, cos ql, cos qv and c Overlapping samples ® statistical correlations between partial widths, determined with bootstraping technique Unfolding of resolution effect with the SVD algorithm [Nucl.Instr.Meth. A372, 469 (1996)]

CLN fit to the differential widths Points with error bars: Belle data, red histogram: fit result, dashed histogram: Dc2=1 contour

CLN fit to the differential widths (2) c2 = 39.8 for 40-4 degrees of freedom Preliminary!

Belle B ® Dln with hadronic tag Phys. Rev. D93, 032006 (2016)

Event reconstruction Identical event reconstruction method 10 D+ and 13 D0 modes are used on the signal side, covering 28.9% and 40.1% of the width Signal extraction from M2miss in 10 bins of w 16,992 +/- 192 signal events (5150 +/- 95 neutral, 11,843 +/- 167 charged B events)

Differential width and branching fraction

CLN fit to the differential widths

BGL fit to differential widths and lattice data

Summer 2016 HFAG results for |Vcb|exclusive

hEWF(1)|Vcb| (B ® D*ln) hEWF(1)|Vcb| = (35.61 +/- 0.11 +/- 0.41) x 10-3 [2014: hEWF(1)|Vcb| = (35.81 +/- 0.11 +/- 0.44) x 10-3]

hEWG(1)|Vcb| (B ® Dln) hEWG(1)|Vcb| = (41.57 +/- 0.45 +/- 0.89) x 10-3

|Vcb| exclusive B ® D*ln B ® Dln hEWF(1)|Vcb| = (35.61 +/- 0.11stat +/- 0.41syst) x 10-3 hEWF(1) = (0.920 +/- 0.014) [FNAL/MILC, PRD89, 114504] |Vcb| = (38.71 +/- 0.47exp +/- 0.59th) x 10-3 B ® Dln hEWG(1)|Vcb| = (41.57 +/- 0.45 +/- 0.89) x 10-3 G(1) = 1.0541 +/- 0.0083 [FNAL/MILC, PRD92, 034506] hEW = 1.0066 +/- 0.0016 [NPB 196, 83] |Vcb| = (39.18 +/- 0.94exp +/- 0.31th) x 10-3

Branching fractions

Summary Belle B0 ® D*-l+n with hadronic tag [BELLE-CONF-1612] About 2400 reconstructed decays Br(B0 ® D*-l+n) = (4.95 +/- 0.11stat +/- 0.21syst)% CLN fit: |Vcb| = (37.4 +/- 1.2) x 10-3 Belle B ® Dln with hadronic tag [PRD93, 032006 (2016)] About 17,000 signal events (charged and neutral) Br(B0 ® Dln) = (2.31 +/- 0.03stat +/- 0.11syst)% CLN fit: |Vcb| = (39.86 +/- 1.33) x 10-3 BGL fit: |Vcb| = (40.83 +/- 1.13) x 10-3 HFAG summer 2016 averages B ® D*ln: |Vcb| = (38.71 +/- 0.47exp +/- 0.59th) x 10-3 B ® Dln: |Vcb| = (39.18 +/- 0.94exp +/- 0.31th) x 10-3

backup

1999 – 2010: B factory at KEK (Japan) Linac KEKB double ring e+e- collider e+e- ® Y(4S) ® BB Belle detector World largest B meson sample ~771 million BB events Over 450 Belle physics publications

Tagging techniques for Y(4S) events Tagging provides: Background suppression Information on Bsig (4-momentum) PURITY EFFICIENCY Untagged No requirement on Btag High efficiency, low purity Semileptonic tag Btag ® D*ln Efficiency ~O(0.2%) Hadronic tag Btag ® hadrons Efficiency ~O(0.1%)

Systematic uncertainties on BR(B0 ® D*-l+n)