Physics 222 UCSD/225b UCSB Lecture 7 Mixing & CP violation (3 of 3) Today, we focus on how to measure things, and what the present knowledge is from the combination of theory and experiment. Take 2 sources as references: David MacFarlane at SSI 2002 Soeren Prell at Lepton-Photon 2009 CKM Matrix Element Magnitudes

e Vud n p e

Vcd D Vus Lepton Photon 2009

K e Vcs D Vub

B Vcb Bd Vts Bd Bs e

K Vtd Bd e Vtb Bs b Expt. Status of the CKM Matrix (S.Prell)

e D W t 2 QuickTime and a decompressor are needed to see this picture.

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decompressor are needed to see this picture. Why does this matter? Heavy Quark Symmetry predicts that the B -> D* transition in B -> D* l nu has trivial form factor for the part of phase space when the D* is at rest in the B restframe. However, this also leads to minimal pT for the slow pion in the D* -> D pi decay. |Vcb| is theoretically most accurately extracted from experimental data where it is experimentally most difficult.

QuickTime and a decompressor are needed to see this picture. Luminosity accumulated by Belle reached 1000/fb on November 29th 2009. QuickTime and a decompressor are needed to see this picture.

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decompressor are needed to see this picture. QuickTime and a decompressor are needed to see this picture. QuickTime and a decompressor are needed to see this picture.

QuickTime and a decompressor are needed to see this picture. s

Theor. clean measurement of |S| = sin2 with B J/ K0, from b (cc) s decays J/ K*,

(2S)KS, cKS, & c1KS by BaBar and Belle SWA =0.672 0.023 CWA =0.004 0.019 BaBar, PRD 79,072009 (2009) statistically limited S =0.687 0.028 0.012 C =0.024 0.020 0.016 Lepton Photon 2009

=(21.1 0.9)o Expt. Status of the CKM Matrix (S.Prell) 22 QuickTime and a decompressor are needed to see this picture.

QuickTime and a decompressor are needed to see this picture. Lepton-photon 2009 Dalitz analysis now clearly dominates the precision. UTFit =(75 12)o Basic idea: b -> u transition with c-bar quark from virtual W

interferes with b -> c transition, IFF one chooses a decay of the D meson that is common for D and anti-D meson. The resonance structure then provides the CP conserving phase analyzer to measure gamma from the interference. B : D K S0 + Poluektov @ EPS09 B + : D K S0 +

QuickTime and a decompressor are needed to see this picture. QuickTime and a decompressor are needed to see this picture. Global CKM Fit Other

AllCKM constraints angles Consistency of angles = (89.0 +4.4 o

4.2 ) o = (21.1 0.9 ) o = (75 12 )

o + + = (185 13) UTFit: =0.154 0.022 =0.342 0.014 Lepton Photon 2009 Consistency of angles and sides

from global fit Overall good fit (CKMFitter: global p-value 45%) ~2 tension between sin2 and K / Vub correction to K will make it worse (Buras, CKMFitter: =0.139+0.025 Guadagnoli, PRD78, 0.027 =0.341+0.016 033005 (2008))

0.015 Expt. Status of the CKM Matrix (S.Prell) 29 Future directions Ever more precise measurement of: sin2 from J/ Ks from Dalitz analysis

Measurements of processes that only occur at 2nd order weak interaction in standard model B -> s l+ l B -> s nu nubar Measurements of helicity suppressed decays B to mu+mu- CP violation in the Bs system

s

s from Bs J/ decays D0 and CDF measure s with angular dependent fit to decay time distributions of Bs J/ New physics in BsBs mixing CDF/PHYS/BOTTOM/CDFR/9787, D Note 5928-CONF

Simultaneous fit for s and s SM predicts s very small (~0.02) sensitive to new physics in Bs mixing Prospects D0 and CDF working on updates with 2x samples

LHCb sensitivity with 0.5 fb-1: (s) = 0.02 Lepton Photon 2009 Expt. Status of the CKM Matrix (S.Prell) 31 QuickTime and a decompressor are needed to see this picture.