Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω0c  Baryon

LHCb Collaboration; Nigel Watson

doi:10.1103/PhysRevLett.132.081802

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω⁰_c Baryon

LHCb Collaboration, Nigel Watson

Physics and Astronomy

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Abstract

The first observation of the singly Cabibbo-suppressed
Ω
0
c
→
Ω
−
K
+
and
Ω
0
c
→
Ξ
−
π
+
decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of
5.4

fb
−
1
, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be
B
(
Ω
0
c
→
Ω
−
K
+
)
B
(
Ω
0
c
→
Ω
−
π
+
)
=
[
6.08
±
0.51
(
stat
)
±
0.40
(
syst
)
]
%
,
B
(
Ω
0
c
→
Ξ
−
π
+
)
B
(
Ω
0
c
→
Ω
−
π
+
)
=
[
15.81
±
0.87
(
stat
)
±
0.44
(
syst
)
±
0.16
(
ext
)
]
%
.
In addition, using the
Ω
0
c
→
Ω
−
π
+
decay channel, the
Ω
0
c
baryon mass is measured to be
M
(
Ω
0
c
)
=
2695.28
±
0.07
(
stat
)
±
0.27
(
syst
)
±
0.30
(
ext
)

MeV
,
improving the precision of the previous world average by a factor of 4.

Original language	English
Article number	081802
Journal	Physical Review Letters
Volume	132
DOIs	https://doi.org/10.1103/PhysRevLett.132.081802
Publication status	Published - 23 Feb 2024

Bibliographical note

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland), and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); and the Leverhulme Trust, the Royal Society, and UKRI (United Kingdom).

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Cite this

@article{cfe2d2e932584faa89294dc7c5c2e832,

title = "Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω0c Baryon",

abstract = "The first observation of the singly Cabibbo-suppressed Ω0c→Ω−K+ and Ω0c→Ξ−π+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to beB(Ω0c→Ω−K+)B(Ω0c→Ω−π+)=[6.08±0.51(stat)±0.40(syst)]%,B(Ω0c→Ξ−π+)B(Ω0c→Ω−π+)=[15.81±0.87(stat)±0.44(syst)±0.16(ext)]%.In addition, using the Ω0c→Ω−π+ decay channel, the Ω0c baryon mass is measured to be M(Ω0c)=2695.28±0.07(stat)±0.27(syst)±0.30(ext) MeV, improving the precision of the previous world average by a factor of 4.",

author = "{LHCb Collaboration} and Nigel Watson",

note = "We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland), and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Sk{\l}odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R{\'e}gion Auvergne-Rh{\^o}ne-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracci{\'o}n Talento, CM (Spain); SRC (Sweden); and the Leverhulme Trust, the Royal Society, and UKRI (United Kingdom).",

year = "2024",

month = feb,

day = "23",

doi = "10.1103/PhysRevLett.132.081802",

language = "English",

volume = "132",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

}

TY - JOUR

T1 - Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω0c Baryon

AU - LHCb Collaboration

AU - Watson, Nigel

N1 - We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland), and NERSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); and the Leverhulme Trust, the Royal Society, and UKRI (United Kingdom).

PY - 2024/2/23

Y1 - 2024/2/23

N2 - The first observation of the singly Cabibbo-suppressed Ω0c→Ω−K+ and Ω0c→Ξ−π+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to beB(Ω0c→Ω−K+)B(Ω0c→Ω−π+)=[6.08±0.51(stat)±0.40(syst)]%,B(Ω0c→Ξ−π+)B(Ω0c→Ω−π+)=[15.81±0.87(stat)±0.44(syst)±0.16(ext)]%.In addition, using the Ω0c→Ω−π+ decay channel, the Ω0c baryon mass is measured to be M(Ω0c)=2695.28±0.07(stat)±0.27(syst)±0.30(ext) MeV, improving the precision of the previous world average by a factor of 4.

AB - The first observation of the singly Cabibbo-suppressed Ω0c→Ω−K+ and Ω0c→Ξ−π+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to beB(Ω0c→Ω−K+)B(Ω0c→Ω−π+)=[6.08±0.51(stat)±0.40(syst)]%,B(Ω0c→Ξ−π+)B(Ω0c→Ω−π+)=[15.81±0.87(stat)±0.44(syst)±0.16(ext)]%.In addition, using the Ω0c→Ω−π+ decay channel, the Ω0c baryon mass is measured to be M(Ω0c)=2695.28±0.07(stat)±0.27(syst)±0.30(ext) MeV, improving the precision of the previous world average by a factor of 4.

U2 - 10.1103/PhysRevLett.132.081802

DO - 10.1103/PhysRevLett.132.081802

M3 - Article

SN - 0031-9007

VL - 132

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 081802

ER -

Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω0c Baryon

Abstract

Bibliographical note

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Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω⁰_c Baryon