TY - JOUR
T1 - Conclusions from CDF results on CP violation in D0 → π+π-,K+K- and future tasks
AU - Bigi, Ikaros I.
AU - Paul, Ayan
AU - Recksiegel, Stefan
PY - 2011
Y1 - 2011
N2 - Within the Standard Model (SM) one predicts both direct and indirect CP violation in D0 → π+π-,K +K- transitions, although the effects are tiny: Indirect CP asymmetry cannot exceed O(10-4), probably even O(10-5); direct effects are estimated at not larger than 10-4.At B factories direct and indirect asymmetries have been studied with (t)/τD0 ≈ 1; no CP asymmetry was found with an upper bound of about 1%.CDF has shown intriguing data on CP violation in D0 → π+π-, K+K- with (t)/τD0 ≈ 2.4[2.65].Also,CDF has not seen any CP violation.For direct CP asymmetry,CDF has a sensitivity similar to the combination of the B factories,yet for indirect CP violation it yields a significantly smaller sensitivity of aind CP = (-0.01 ± 0.06stat ± 0.05syst)% due to it being based on longer decay times.New Physics models (NP) like Little Higgs Models with T-Parity (LHT) can produce an indirect CP asymmetry up to 1%; CDF's findings thus cover the upper range of realistic NP predictions ̃ 0.1-1%. One hopes that LHCb and a Super-Flavour Factory will probe the lower range down to ̃ 0.01%.Such non-ad-hoc NP like LHT cannot enhance direct CP violation significantly over the SM level in D 0 → π+π-,K+K- and D± → π±K+K - transitions,but others might well do so.
AB - Within the Standard Model (SM) one predicts both direct and indirect CP violation in D0 → π+π-,K +K- transitions, although the effects are tiny: Indirect CP asymmetry cannot exceed O(10-4), probably even O(10-5); direct effects are estimated at not larger than 10-4.At B factories direct and indirect asymmetries have been studied with (t)/τD0 ≈ 1; no CP asymmetry was found with an upper bound of about 1%.CDF has shown intriguing data on CP violation in D0 → π+π-, K+K- with (t)/τD0 ≈ 2.4[2.65].Also,CDF has not seen any CP violation.For direct CP asymmetry,CDF has a sensitivity similar to the combination of the B factories,yet for indirect CP violation it yields a significantly smaller sensitivity of aind CP = (-0.01 ± 0.06stat ± 0.05syst)% due to it being based on longer decay times.New Physics models (NP) like Little Higgs Models with T-Parity (LHT) can produce an indirect CP asymmetry up to 1%; CDF's findings thus cover the upper range of realistic NP predictions ̃ 0.1-1%. One hopes that LHCb and a Super-Flavour Factory will probe the lower range down to ̃ 0.01%.Such non-ad-hoc NP like LHT cannot enhance direct CP violation significantly over the SM level in D 0 → π+π-,K+K- and D± → π±K+K - transitions,but others might well do so.
KW - Beyond Standard Model
KW - CP violation
KW - Rare Decays
UR - http://www.scopus.com/inward/record.url?scp=80053142357&partnerID=8YFLogxK
U2 - 10.1007/JHEP06(2011)089
DO - 10.1007/JHEP06(2011)089
M3 - Article
AN - SCOPUS:80053142357
SN - 1126-6708
VL - 2011
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 6
M1 - 89
ER -