TY - JOUR
T1 - New physics and CP violation in singly Cabibbo suppressed D decays
AU - Grossman, Yuval
AU - Kagan, Alexander L.
AU - Nir, Yosef
PY - 2007/2/28
Y1 - 2007/2/28
N2 - We analyze various theoretical aspects of CP violation in singly Cabibbo suppressed (SCS) D meson decays, such as D→KK,ππ. In particular, we explore the possibility that CP asymmetries will be measured close to the present level of experimental sensitivity of O(10-2). Such measurements would signal new physics. We make the following points: (i) The mechanism at work in neutral D decays could be indirect or direct CP violation (or both). (ii) One can experimentally distinguish between these possibilities. (iii) If the dominant CP violation is indirect, then there are clear predictions for other modes. (iv) Tree-level direct CP violation in various known models is constrained to be much smaller than 10-2. (v) SCS decays, unlike Cabibbo favored or doubly Cabibbo suppressed decays, are sensitive to new contributions from QCD penguin operators and especially from chromomagnetic dipole operators. This point is illustrated with supersymmetric gluino-squark loops, which can yield direct CP violating effects of O(10-2).
AB - We analyze various theoretical aspects of CP violation in singly Cabibbo suppressed (SCS) D meson decays, such as D→KK,ππ. In particular, we explore the possibility that CP asymmetries will be measured close to the present level of experimental sensitivity of O(10-2). Such measurements would signal new physics. We make the following points: (i) The mechanism at work in neutral D decays could be indirect or direct CP violation (or both). (ii) One can experimentally distinguish between these possibilities. (iii) If the dominant CP violation is indirect, then there are clear predictions for other modes. (iv) Tree-level direct CP violation in various known models is constrained to be much smaller than 10-2. (v) SCS decays, unlike Cabibbo favored or doubly Cabibbo suppressed decays, are sensitive to new contributions from QCD penguin operators and especially from chromomagnetic dipole operators. This point is illustrated with supersymmetric gluino-squark loops, which can yield direct CP violating effects of O(10-2).
UR - http://www.scopus.com/inward/record.url?scp=33847368490&partnerID=8YFLogxK
U2 - 10.1103/physrevd.75.036008
DO - 10.1103/physrevd.75.036008
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AN - SCOPUS:33847368490
SN - 1550-7998
VL - 75
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 3
M1 - 036008
ER -