The Ξ0c baryon is unstable and usually decays into charmless final states by the c→s¯d transition. It can, however, also disintegrate into a π− meson and a Λ+c baryon via s quark decay or via cs→dc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξ0c→π−Λ+c), first measured here to be (0.55±0.02±0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξ+c→pK−π+)=(1.135±0.002±0.387)% is measured.

First branching fraction measurement of the suppressed decay Ξc0 →π- Λc+ / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 102:7(2020). [10.1103/PhysRevD.102.071101]

First branching fraction measurement of the suppressed decay Ξc0 →π- Λc+

Capriotti, L.;Sarti, A.;Sciubba, A.;
2020

Abstract

The Ξ0c baryon is unstable and usually decays into charmless final states by the c→s¯d transition. It can, however, also disintegrate into a π− meson and a Λ+c baryon via s quark decay or via cs→dc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξ0c→π−Λ+c), first measured here to be (0.55±0.02±0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξ+c→pK−π+)=(1.135±0.002±0.387)% is measured.
2020
B physics; branching fraction; flavour changing neutral currents; Hadron- Hadron scattering (experiments); rare decay
01 Pubblicazione su rivista::01a Articolo in rivista
First branching fraction measurement of the suppressed decay Ξc0 →π- Λc+ / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 102:7(2020). [10.1103/PhysRevD.102.071101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1579751
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