Direct CP violation in D meson decays - Rencontres de Moriond

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SM: Large penguin power corrections From SU(3)F fits [Cheng, Chiang, 1001.0987, 1201.0785; Bhattacharya, Gronau, Rosner, 1201.2351; Pirtskhalava, Uttayarat, 1112.5451] we know Signals breakdown of 1/mc expansion O(1) = Tf ∼ Ef = O(1/mc) Power corrections: look at two specific contributions - insertions of Q4, Q6 Joachim Brod (University of Cincinnati) CP violation in D decays 8 / 26
SM: Large penguin power corrections Associated penguin contractions of Q1 cancel scheme and scale dependence Single hard gluon exchange leads to “effective Wilson coefficients” C eff 4 and C eff 6 depending on the gluon virtuality q2 . Setting A T (exp) = Ef in and Nc counting leads to r PC f = A P f (power correction) AT f (experiment) rf,1 ∼ 2Nc|VcbVubC eff 6 |/(C1sinθc), rf,2 ∼ 2|VcbVub(C eff 4 +C eff 6 )|/(C1sinθc). Joachim Brod (University of Cincinnati) CP violation in D decays 9 / 26
Page 1 and 2: Direct CP violation in D meson deca
Page 3 and 4: Definitions Af ≡ A(D 0 → f) = A
Page 5 and 6: So, can it be SM? “There one typi
Page 7: P/T at leading power Leading power
Page 11 and 12: Uncertainties Extraction of annihil
Page 13 and 14: c ū Weak Hamiltonian, written diff
Page 15 and 16: Pbreak T Fit to data nominal ǫU P
Page 17 and 18: By exchanging the spectator quark,
Page 19 and 20: How to distinguish NP from SM NP mo
Page 21 and 22: Backup slides Joachim Brod (Univers
Page 23 and 24: Penguin matrix elements Pf,1 = GF
Page 25 and 26: U-spin decomposition A( ¯ D 0 →

Direct CP violation in D meson decays - Rencontres de Moriond

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