Search for CP violation and measurement of branching fractions and decay asymmetry parameters for Λc+ RIGHTWARDS ARROW Λh+ and Λc+ RIGHTWARDS ARROW Σ0h+ (h = K, π)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476513" target="_blank" >RIV/00216208:11320/23:10476513 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-nrt2kkbDv" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-nrt2kkbDv</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.scib.2023.02.017" target="_blank" >10.1016/j.scib.2023.02.017</a>
Alternative languages
Result language
angličtina
Original language name
Search for CP violation and measurement of branching fractions and decay asymmetry parameters for Λc+ RIGHTWARDS ARROW Λh+ and Λc+ RIGHTWARDS ARROW Σ0h+ (h = K, π)
Original language description
We report a study of Lambda(+)(c)-> Lambda h(+) and Lambda(+)(c)-> Sigma(0)h(+) (h = K, pi) decays based on a data sample of 980 fb(-1) collected with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. The first results of direct CP asymmetry in two-body singly Cabibbo-suppressed (SCS) decays of charmed baryons are measured, A(CP)(dir)(Lambda(+)(c)-> Lambda K+) = +0.021 +/- 0.026 +/- 0.001 and A(CP)(dir)(Lambda(+)(c)-> Sigma K-0(+)) = +0.025 +/- 0.054 +/- 0.004. We also make the most precise measurement of the decay asymmetry parameters (alpha) for the four modes of interest and search for CP violation via the alpha-induced CP asymmetry (A(CP)(alpha)). We measure A(CP)(alpha)(Lambda(+)(c)-> Lambda K+) = -0.023 +/- 0.086 +/- 0.071 and A(CP)(alpha)(Lambda(+)(c)-> Sigma K-0(+)) = +0.08 +/- 0.35 +/- 0.14, which are the first A(CP)(alpha) results for SCS decays of charmed baryons. We search for Lambda-hyperon CP violation in Lambda(+)(c)-> Lambda(+)(c)-> (Lambda, Sigma(0))pi(+) and find A(CP)(alpha)(Lambda -> p pi(-)) = +0.013 +/- 0.007 +/- 0.011. This is the first time that hyperon CP violation has been measured via Cabibbo-favored charm decays. No evidence of baryon CP violation is found. We also obtain the most precise branching fractions for two SCS Lambda(c+) decays, B(Lambda(+)(c) -> Lambda K+) = (6.57 +/- 0.17 +/- 0.11 +/- 0.35) x 10(-4) and B(Lambda(+)(c) -> Sigma K-0(+)) = (3.58 +/- 0.19 +/- 0.06 +/- 0.19) x 10(-4). The first uncertainties are statistical and the second systematic, while the third uncertainties come from the uncertainties on the world average branching fractions of Lambda(+)(c)-> (Lambda, Sigma(0))pi(+).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/GA22-18469S" target="_blank" >GA22-18469S: Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Science Bulletin
ISSN
2095-9273
e-ISSN
2095-9281
Volume of the periodical
68
Issue of the periodical within the volume
68
Country of publishing house
CN - CHINA
Number of pages
10
Pages from-to
583-592
UT code for WoS article
000989723800001
EID of the result in the Scopus database
2-s2.0-85149627520