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First measurement of the \( {\Lambda}_c^{+} \) → pη' decay

Journal Article · · Journal of High Energy Physics (Online)
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We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay \( {\Lambda}_c^{+} \) → pη' with η' → ηπ+π–, using a data sample corresponding to an integrated luminosity of 981 fb–1, collected by the Belle detector at the KEKB e+e– asymmetric-energy collider. A significant \( {\Lambda}_c^{+} \) → pη' signal is observed for the first time with a signal significance of 5.4σ. The relative branching fraction with respect to the normalization mode \( {\Lambda}_c^{+} \) → pK–π+ is measured to be

$$$$ \frac{\mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)}{\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)}=\left(7.54\pm 1.32\pm 0.73\right)\times {10}^{-3}, $$$$

where the uncertainties are statistical and systematic, respectively. Using the world-average value of \( \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) \) = (6.28 ± 0.32) × 10–2, we obtain

$$$$ \mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)=\left(4.73\pm 0.82\pm 0.46\pm 0.24\right)\times {10}^{-4}, $$$$

where the uncertainties are statistical, systematic, and from \( \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) \), respectively.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Australian Research Council (ARC); Austrian Science Fund (FWF); Chinese Academy of Sciences; European Research Council (ERC); Ministry of Education, Youth and Sports of the Czech Republic; Ministry of Science and Higher Education of the Russian Federation; National Natural Science Foundation of China (NSFC); National Research Foundation of Korea (NRF); Shanghai Science and Technology Committee (STCSM); Slovenian Research Agency; USDOE Office of Science (SC), High Energy Physics (HEP); University of Tabuk
Contributing Organization:
BELLE collaboration
Grant/Contract Number:
SC0012704
OSTI ID:
1863879
Report Number(s):
BNL-222924-2022-JAAM
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2022; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS