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Title: Search for the proton decay mode with KamLAND

We present a search for the proton decay mode $$p \rightarrow \bar{v}K^+$$ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from $$p \rightarrow \bar{v}K^+$$ with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is 0:9 ± 0.2 events. The nonbackground-subtracted limit on the partial proton lifetime is τΒ($$p \rightarrow \bar{v}K^+$$) > 5.4 x 1032 years at 90% C.L.
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Publication Date:
OSTI Identifier:
1236376
Report Number(s):
LBNL--1001125
Journal ID: ISSN 2470-0010; ir:1001125
Grant/Contract Number:
AC02- 05CH11231; FG02-01ER41166
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 92; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Nuclear Science Div.
Sponsoring Org:
USDOE
Contributing Orgs:
KamLAND Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS