Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks

Details Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks

2011-03-29

arxiv.org/abs/1103.5785v2

JHEP06 (2011) 089

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 1 figure. V2 has minor corrections and corresponds to the published version

Scientific paper

10.1007/JHEP06(2011)089

Within the Standard Model (SM) one predicts both direct and indirect CP violation in D^0 \to \pi^+\pi^-, 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 /\tau_{D^0} ~ 1; no CP asymmetry was found with an upper bound of about 1%. CDF has shown intriguing data on CP violation in D^0 \to \pi^+\pi^- [K^+K^-] with /\tau_{D^0} ~ 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 a_{cp}^{ind}=(-0.01 +- 0.06_{stat} +- 0.05_{syst})% 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 \to \pi^+\pi^-, K^+K^- and D^{\pm} \to \pi^{\pm}K^+K^- transitions, but others might well do so.

Affiliated with

Also associated with

No associations

Rating

Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conclusions from CDF Results on CP Violation in D^0 \to π^+π^-, K^+K^- and Future Tasks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-566910