Calculation of BSM Kaon B-parameters using improved staggered quarks in N_f = 2+1 QCD

We present updated results for kaon B-parameters for operators arising in models of new physics.We use HYP-smeared staggered quarks on the Nf = 2 + 1 MILC asqtad lattices. During the last year we have added new ensembles, which has necessitated chiral-continuum fitting with more elaborate fitting fu...

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Published inPos : proceedings of science Vol. 214
Main Authors Leem, Jaehoon, Jang, Yong-Chull, Jeong, Hwancheol, Jung, Chulwoo, Kim, Hyung-Jin, Kim, Jangho, Kim, Seonghee, Lee, Weonjong, Pak, Jeonghwan, Park, Sungwoo, Sharpe, Stephen R., Yoon, Boram
Format Journal Article
LanguageEnglish
Published United States SISSA 21.05.2015
Subjects
Atomic
ATOMIC AND MOLECULAR PHYSICS
Nuclear and Particle Physics
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Abstract We present updated results for kaon B-parameters for operators arising in models of new physics.We use HYP-smeared staggered quarks on the Nf = 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 4–5σ to 2–3σ.
AbstractList We present updated results for kaon B-parameters for operators arising in models of new physics.We use HYP-smeared staggered quarks on the Nf = 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 4–5σ to 2–3σ.
Author Park, Sungwoo
Lee, Weonjong
Yoon, Boram
Jung, Chulwoo
Jang, Yong-Chull
Kim, Jangho
Leem, Jaehoon
Kim, Hyung-Jin
Jeong, Hwancheol
Kim, Seonghee
Sharpe, Stephen R.
Pak, Jeonghwan
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  fullname: Jeong, Hwancheol
  organization: Seoul National Univ., Seoul (South Korea)
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  fullname: Jung, Chulwoo
  organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
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  fullname: Kim, Hyung-Jin
  organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
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  organization: Seoul National Univ., Seoul (South Korea)
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  organization: Seoul National Univ., Seoul (South Korea)
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  fullname: Park, Sungwoo
  organization: Seoul National Univ., Seoul (South Korea)
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  fullname: Sharpe, Stephen R.
  organization: Univ. of Washington, Seattle, WA (United States)
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  fullname: Yoon, Boram
  organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)] (ORCID:0000000300696514
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Snippet We present updated results for kaon B-parameters for operators arising in models of new physics.We use HYP-smeared staggered quarks on the Nf = 2 + 1 MILC...
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Title Calculation of BSM Kaon B-parameters using improved staggered quarks in N_f = 2+1 QCD
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Volume 214
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