Direct CP violation in D meson decays - Rencontres de Moriond

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Measurements First significant measurements of CP violation in the up-quark sector LHCb [R. Aaij et al., 1112.0938]: CDF [La Thuile 2012]: ∆ACP = (−0.82±0.21±0.11)% ∆ACP = (−0.62±0.21±0.10)% leading to new world average [La Thuile 2012]: ∆ACP = (−0.67±0.16)% Can it be standard model (SM)? Can it be new physics (NP)? Can we distinguish NP from SM? Joachim Brod (University of Cincinnati) CP violation in D decays 4 / 26
So, can it be SM? “There one typically finds asymmetries ∼ O(10 −4 ), i.e. somewhat smaller than the rough benchmark stated above. Yet 10 −3 effects are conceivable, and even 1% effects cannot be ruled out completely.” [D. Benson et al., hep-ex/0309021] “This would lead to gigantic CP violations, an asymmetry of order 1. This is of course very unlikely [...]” [M. Golden, B. Grinstein, Phys. Lett. B 222] Can we be more specific? Joachim Brod (University of Cincinnati) CP violation in D decays 5 / 26
Page 1 and 2: Direct CP violation in D meson deca
Page 3: Definitions Af ≡ A(D 0 → f) = A
Page 7 and 8: P/T at leading power Leading power
Page 9 and 10: SM: Large penguin power corrections
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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