Evidence for the singly Cabibbo suppressed decay Λc+ →pη and search for Λc+ →pπ0

M. Ablikim; M. N. Achasov; S. Ahmed; X. C. Ai; O.  Albayrak; M. Albrecht; D. J. Ambrose; Z. Haddadi; N. Kalantar-Nayestanaki; M. Kavatsyuk; H. Löhner; J. Messchendorp; M. Tiemens; BESIII Collaboration

doi:10.1103/PhysRevD.95.111102

Evidence for the singly Cabibbo suppressed decay Λ_c⁺ →pη and search for Λ_c⁺ →pπ⁰

M. Ablikim, M. N. Achasov, S. Ahmed, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, Z. Haddadi, N. Kalantar-Nayestanaki, M. Kavatsyuk, H. Löhner, J. Messchendorp, M. Tiemens, BESIII Collaboration

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Abstract

We study the singly Cabibbo suppressed decays Λc+→pη and Λc+→pπ0 using Λc+Λ- pairs produced by e+e- collisions at a center-of-mass energy of s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb-1. We find the first evidence for the decay Λc+→pη with a statistical significance of 4.2σ and measure its branching fraction to be B(Λc+→pη)=(1.24±0.28(stat)±0.10(syst))×10-3. No significant Λc+→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λc+→pπ0)<2.7×10-4 at the 90% confidence level.

Original language	English
Article number	111102
Journal	Physical Review D
Volume	95
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.95.111102
Publication status	Published - 30-Jun-2017

Keywords

QUARK
MODEL
NONLEPTONIC DECAYS
CHARMED BARYONS

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Evidence for the singly Cabibbo suppressed decayFinal publisher's version, 274 KBLicence: Taverne

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Ablikim, M., Achasov, M. N., Ahmed, S., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., Haddadi, Z., Kalantar-Nayestanaki, N., Kavatsyuk, M., Löhner, H., Messchendorp, J., Tiemens, M., & BESIII Collaboration (2017). Evidence for the singly Cabibbo suppressed decay Λ_c⁺ →pη and search for Λ_c⁺ →pπ⁰. Physical Review D, 95(11), Article 111102. https://doi.org/10.1103/PhysRevD.95.111102

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title = "Evidence for the singly Cabibbo suppressed decay Λc+ →pη and search for Λc+ →pπ0",

abstract = "We study the singly Cabibbo suppressed decays Λc+→pη and Λc+→pπ0 using Λc+Λ- pairs produced by e+e- collisions at a center-of-mass energy of s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb-1. We find the first evidence for the decay Λc+→pη with a statistical significance of 4.2σ and measure its branching fraction to be B(Λc+→pη)=(1.24±0.28(stat)±0.10(syst))×10-3. No significant Λc+→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λc+→pπ0)<2.7×10-4 at the 90% confidence level.",

keywords = "QUARK, MODEL, NONLEPTONIC DECAYS, CHARMED BARYONS",

author = "M. Ablikim and Achasov, {M. N.} and S. Ahmed and Ai, {X. C.} and O. Albayrak and M. Albrecht and Ambrose, {D. J.} and Z. Haddadi and N. Kalantar-Nayestanaki and M. Kavatsyuk and H. L{\"o}hner and J. Messchendorp and M. Tiemens and {BESIII Collaboration}",

year = "2017",

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doi = "10.1103/PhysRevD.95.111102",

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Ablikim, M, Achasov, MN, Ahmed, S, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Haddadi, Z, Kalantar-Nayestanaki, N , Kavatsyuk, M, Löhner, H, Messchendorp, J, Tiemens, M & BESIII Collaboration 2017, 'Evidence for the singly Cabibbo suppressed decay Λ_c⁺ →pη and search for Λ_c⁺ →pπ⁰', Physical Review D, vol. 95, no. 11, 111102. https://doi.org/10.1103/PhysRevD.95.111102

TY - JOUR

T1 - Evidence for the singly Cabibbo suppressed decay Λc+ →pη and search for Λc+ →pπ0

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Ahmed, S.

AU - Ai, X. C.

AU - Albayrak, O.

AU - Albrecht, M.

AU - Ambrose, D. J.

AU - Haddadi, Z.

AU - Kalantar-Nayestanaki, N.

AU - Kavatsyuk, M.

AU - Löhner, H.

AU - Messchendorp, J.

AU - Tiemens, M.

AU - BESIII Collaboration

PY - 2017/6/30

Y1 - 2017/6/30

N2 - We study the singly Cabibbo suppressed decays Λc+→pη and Λc+→pπ0 using Λc+Λ- pairs produced by e+e- collisions at a center-of-mass energy of s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb-1. We find the first evidence for the decay Λc+→pη with a statistical significance of 4.2σ and measure its branching fraction to be B(Λc+→pη)=(1.24±0.28(stat)±0.10(syst))×10-3. No significant Λc+→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λc+→pπ0)<2.7×10-4 at the 90% confidence level.

AB - We study the singly Cabibbo suppressed decays Λc+→pη and Λc+→pπ0 using Λc+Λ- pairs produced by e+e- collisions at a center-of-mass energy of s=4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb-1. We find the first evidence for the decay Λc+→pη with a statistical significance of 4.2σ and measure its branching fraction to be B(Λc+→pη)=(1.24±0.28(stat)±0.10(syst))×10-3. No significant Λc+→pπ0 signal is observed. We set an upper limit on its branching fraction B(Λc+→pπ0)<2.7×10-4 at the 90% confidence level.

KW - QUARK

KW - MODEL

KW - NONLEPTONIC DECAYS

KW - CHARMED BARYONS

U2 - 10.1103/PhysRevD.95.111102

DO - 10.1103/PhysRevD.95.111102

M3 - Article

SN - 1550-7998

VL - 95

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - 111102

ER -