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Paper detail

Calculation of BSM Kaon B-parameters using Staggered Quarks

We present updated results for kaon B-parameters for operators arising in models of new physics. We use HYP-smeared staggered quarks on the $N_f = 2+1$ MILC asqtad lattices. During the last year we have added new ensembles, which has necessitated chiral-continuum fitting with more elaborate fitting functions. We have also corrected an error in a two-loop anomalous dimension used to evolve results between different scales. Our results for the beyond-the-Standard-Model B-parameters have total errors of $5-10$\%. We find that the discrepancy observed last year between our results and those of the RBC/UKQCD and ETM collaborations for some of the B-parameters has been reduced from $4\!-\!5\,σ$ to $2\!-\!3\,σ$.

preprint2014arXivOpen access
Yong-Chull JangHwancheol JeongJangho KimSeonghee KimWeonjong LeeJaehoon LeemJeonghwan PakSungwoo ParkChulwoo JungHyung-Jin KimStephen R. SharpeBoram Yoon
hep-phhep-lat
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Yong-Chull JangHwancheol JeongJangho KimSeonghee KimWeonjong LeeJaehoon LeemJeonghwan PakSungwoo ParkChulwoo JungHyung-Jin KimStephen R. SharpeBoram Yoon

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