181 research outputs found
Standard Model and New physics for ε′k/εk
No full textThe first result of the lattice simulation and improved perturbative calculations have pointed to a discrepancy between data on ε′k/εk and the standard-model (SM) prediction. Several new physics (NP) models can explain this discrepancy, and such NP models are likely to predict deviations of ℬ(K → πvv) from the SM predictions, which can be probed precisely in the near future by NA62 and KOTO experiments. We present correlations between ε′k/εk and ℬ(K → πvv) in two types of NP scenarios: a box dominated scenario and a Z-penguin dominated one. It is shown that different correlations are predicted and the future precision measurements of K → πvv can distinguish both scenarios
Recent developments on direct violation in the kaon system and connection to measurements
No full textThe first lattice result from the RBC and UKQCD Collaborations and improved perturbative calculations of have implied that the Standard-Model (SM) expectation deviates from measured values at the level. Since comes from -violating FCNC and is significantly suppressed in the SM, the discrepancy can be explained easily in several new physics (NP) models. In this contribution, it is shown that correlations with the other rare decays, especially and , are crucial for discrimination of the NP models. These channels can be probed precisely in the future by the NA62 and KOTO experiments for and LHCb experiment for .The first lattice result from the RBC and UKQCD Collaborations and improved perturbative calculations of have implied that the Standard-Model (SM) expectation deviates from measured values at the level. Since comes from -violating FCNC and is significantly suppressed in the SM, the discrepancy can be explained easily in several new physics (NP) models. In this contribution, it is shown that correlations with the other rare decays, especially and , are crucial for discrimination of the NP models. These channels can be probed precisely in the future by the NA62 and KOTO experiments for and LHCb experiment for
Making it Just in Time: Author-Creator Matsumoto Taiyō
No full textTranslated by Jon Holt and Teppei Fukuda
The first time I can remember encountering Matsumoto Taiyō’s work was probably when he released his short story collection, Blue Spring (Aoi haru - Matsumoto Taiyō tanpenshū [stories published from 1990 to 1993; Shōgakukan, 1993]). All of the stories concern a bunch of young dudes -- full of desires, frustrations, and violent tendencies -- and no chance they can ever get past those things. I thought to myself at that time, “Ah, I bet this stuff means a lot to readers in their teens, but they don’t really do anything for me.” After all, I was a man in my forties, so this stuff wasn’t on my radar as I was busy becoming a grown-up. Keep in mind that Taiyō himself was just in his early twenties. So, it really wasn’t that unnatural for him to write about life like that
Affect of QED corrections on R(D)
No full textWe discuss long-distance QED contributions to B^0 → D^+τν and B^− →D^0τν relative to B^0 → D^+µν and B^− → D^0µν, respectively, in the Standard Model. We point out that the QED corrections to the ratios R(D^+) and R(D^0) are not the same and not negligible. The reason is that long-distance QED corrections depend on the masses and relative velocities of the daughter particles; muon mode is a relativistic decay but tau mode is not.</p
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