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Title: Improved lattice computation of proton decay matrix elements

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4]
  1. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center and High Energy Theory Group
  3. RIKEN Advanced Institute for Computational Science, Kobe (Japan)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). High Energy Theory Group

In this paper, we present an improved result for the lattice computation of the proton decay matrix elements in Nf = 2 + 1 QCD. In this study, by adopting the error reduction technique of all-mode-averaging, a significant improvement of the statistical accuracy is achieved for the relevant form factor of proton (and also neutron) decay on the gauge ensemble of Nf= 2 + 1 domain-wall fermions with mπ = 0.34 – 0.69 GeV on a 2.7 fm3 lattice, as used in our previous work. We improve the total accuracy of matrix elements to 10–15% from 30–40% for p → πe+ or from 20–40% for p → K$$\bar{ν}$$. The accuracy of the low-energy constants α and β in the leading-order baryon chiral perturbation theory (BChPT) of proton decay are also improved. The relevant form factors of p → π estimated through the “direct” lattice calculation from the three-point function appear to be 1.4 times smaller than those from the “indirect” method using BChPT with α and β . It turns out that the utilization of our result will provide a factor 2–3 larger proton partial lifetime than that obtained using BChPT. Lastly, we also discuss the use of these parameters in a dark matter model.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0012704
OSTI ID:
1413938
Report Number(s):
BNL-114705-2017-JA; PRVDAQ; KA2401012; TRN: US1800594
Journal Information:
Physical Review D, Vol. 96, Issue 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (10)

Neutron disappearance inside the nucleus journal January 2019
Novel GUT with apparently complete SU(5) multiplets journal September 2019
Inclusive nucleon decay searches as a frontier of baryon number violation journal January 2020
n n ¯ oscillations and the neutron lifetime journal January 2019
Partial compositeness and baryon matrix elements on the lattice journal May 2019
A minimal SU(5) SuperGUT in pure gravity mediation journal June 2019
Proton decay into charged leptons text January 2017
Partial compositeness and baryon matrix elements on the lattice text January 2018
Limits on $R$-parity Violation in High Scale Supersymmetry text January 2019
Baryon-Number-Violating Nucleon and Dinucleon Decays in a Model with Large Extra Dimensions text January 2019

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