Kaon BSM B -parameters using improved staggered fermions from Nf=2+1 unquenched QCD

Choi, Benjamin J.

doi:10.1103/PhysRevD.93.014511

Title: Kaon BSM $B$ -parameters using improved staggered fermions from $N_{f} = 2 + 1$ unquenched QCD

Journal Article · Thu Jan 28 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.014511· OSTI ID:1340364

Choi, Benjamin J. ^[1]

Seoul National Univ. (Korea, Republic of). Lattice Gauge Theory Research Center, FPRD, and CTP, Department of Physics and Astronomy. et al.

In this paper, we present results for the matrix elements of the additional ΔS = 2 operators that appear in models of physics beyond the Standard Model (BSM), expressed in terms of four BSM B -parameters. Combined with experimental results for ΔM_K and ε_K, these constrain the parameters of BSM models. We use improved staggered fermions, with valence hypercubic blocking transfromation (HYP)-smeared quarks and N_f = 2 + 1 flavors of “asqtad” sea quarks. The configurations have been generated by the MILC Collaboration. The matching between lattice and continuum four-fermion operators and bilinears is done perturbatively at one-loop order. We use three lattice spacings for the continuum extrapolation: a ≈ 0.09 , 0.06 and 0.045 fm. Valence light-quark masses range down to ≈ m$$phys\atop{s}$$ /13 while the light sea-quark masses range down to ≈ m$$phys\atop{s}$$ / 20 . Compared to our previous published work, we have added four additional lattice ensembles, leading to better controlled extrapolations in the lattice spacing and sea-quark masses. We report final results for two renormalization scales, μ = 2 and 3 GeV, and compare them to those obtained by other collaborations. Agreement is found for two of the four BSM B-parameters (B₂ and B$$SUSY\atop{3}$$ ). The other two (B₄ and B₅) differ significantly from those obtained using regularization independent momentum subtraction (RI-MOM) renormalization as an intermediate scheme, but are in agreement with recent preliminary results obtained by the RBC-UKQCD Collaboration using regularization independent symmetric momentum subtraction (RI-SMOM) intermediate schemes.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: SWME Collaboration

Grant/Contract Number:: SC00112704; AC02-98CH10886; FG02-96ER40956; SC0011637

OSTI ID:: 1340364

Alternate ID(s):: OSTI ID: 1236402

Report Number(s):: BNL-112252-2016-JA; KB0301020

Journal Information:: Physical Review D, Vol. 93, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Title: Kaon BSM B -parameters using improved staggered fermions from N f = 2 + 1 unquenched QCD

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Title: Kaon BSM $B$ -parameters using improved staggered fermions from $N_{f} = 2 + 1$ unquenched QCD