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First Measurement of the Λc+→pη′\Lambda_c^+ \to p \eta' decay

Collaboration
Dec 28, 2021
14 pages
Published in:
  • JHEP 03 (2022) 090,
  • JHEP 03 (2022) 090
  • Published: Mar 15, 2022
e-Print:
DOI:
Report number:
  • Belle Preprint 2021-19; KEK Preprint 2021-23
Experiments:
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Abstract: (Springer)
We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λc+ {\Lambda}_c^{+} → pη′ with η′ → ηπ+^{+}π−^{−}, using a data sample corresponding to an integrated luminosity of 981 fb−1^{−1}, collected by the Belle detector at the KEKB e+^{+}e−^{−} asymmetric-energy collider. A significant Λc+ {\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 Λc+ {\Lambda}_c^{+} → pK−^{−}π+^{+} is measured to beB(Λc+→pη′)B(Λc+→pK−π+)=(7.54±1.32±0.73)×10−3, \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 B(Λc+→pK−π+) \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) = (6.28 ± 0.32) × 10−2^{−2}, we obtainB(Λc+→pη′)=(4.73±0.82±0.46±0.24)×10−4, \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 B(Λc+→pK−π+) \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) , respectively.[graphic not available: see fulltext]
Note:
  • 14 pages, 2 figures, accepted for publication in JHEP
  • Branching fraction
  • e+-e− Experiments
  • Charm Physics
  • Particle and Resonance Production
  • electron positron: annihilation
  • electron positron: colliding beams
  • Lambda/c+: hadronic decay
  • Lambda/c+: rare decay
  • eta(958)
  • eta
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