Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)

I (J P ) = ?(?? )Ξ +cc

Status:∗OMITTED FROM SUMMARY TABLE

Nominally the isospin partner of the Ξ ++cc (ccu). While the SELEX experiment (MATTSON 02, OCHERASHVILI 05) claimed
an observation of this state, subsequent searches by BABAR(AUBERT,B 06D), Belle (CHISTOV 06, KATO 14), and LHCb
(AAIJ 13CD, AAIJ 20AX) did not find any significant signal or evidence for the Ξ +cc . However, AAIJ 21AE reports that its search for++ + −Ξ+cc → Ξ c π π , when combined with a prior search for Ξ cc →− +Λ+c K π decays in AAIJ 20AX, yields a signal at 2.9 σ global
significance (4.0 σ local).

Ξ+cc MASSVALUE (MeV)EVTS

DOCUMENT ID

TECNCOMMENT

3518.9± 0.9 OUR AVERAGE
1 OCHERASHVI...05 SELX Σ − nucleus ≈ 600 GeV
3518 ± 362 MATTSON
3519 ± 11602 SELX Σ − nucleus ≈ 600 GeV• • • We do not use the following data for averages, fits, limits, etc. • • •3 AAIJ3623.0± 1.4368 ± 193
21AE LHCB p p at 7, 8, 13 TeV
1 OCHERASHVILI 05 claims “an excess of 5.62 events over ... 1.38 ± 0.13 events” for asignificance of 4.8 σ in p D + K − events.
2 MATTSON 02 claims “an excess of 15.9 events over an expected background of 6.1 ± 0.5
events, a statistical significance of 6.3 σ” in the Λ+ K − π + invariant-mass spectrum.
cThe probability that the peak is a fluctuation increases from 1.0 × 10−6 to 1.1 × 10−4
when the number of bins searched is considered.
3 Uncertainties are statistical only. Because of undetermined systematic uncertainties inthe extraction of this result it cannot be considered a mass measurement. AAIJ 21AE
performs a combined fit to its Ξ + → Ξ + π + π − data and the Ξ + → Λ+ K − π +ccccccdata from AAIJ 20AX, finding a global significance of 2.9 σ (4.0 σ local).

Ξ+cc MEAN LIFE
VALUE (10−15 s)

CL%

DOCUMENT ID

TECNCOMMENT• • • We do not use the following data for averages, fits, limits, etc. • • •<3390
MATTSON02 SELX Σ − nucleus, ≈ 600 GeV

Ξ+cc DECAY MODESModeΓ1Γ2Γ3Fraction (Γi /Γ)− +Λ+c K π+ −Ξ+c π πp D+ K −https://pdg.lbl.gov

not seen
not seenPage 1

Created: 5/31/2024 10:16

Citation: S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024)− +Γ p D + K − /Γ Λ+c K π
VALUEΓ3 /Γ1EVTS

DOCUMENT ID

TECNCOMMENT• • • We do not use the following data for averages, fits, limits, etc. • • •0.36± 0.21
6OCHERASHVI...05 SELX Σ − ≈ 600 GeV

− +Γ Λ+Kπ/Γtotalc

Γ1 /Γ

VALUE

DOCUMENT ID

TECNCOMMENT

1 AAIJ
not seen
20AX LHCB p p at 7, 8, 13 TeV
1 No significant signal is observed in the mass range 3.4–3.8 GeV

+ − /ΓΓ Ξ+total
c π π
VALUE

CL%

Γ2 /Γ
EVTS

DOCUMENT ID

TECNCOMMENT

1 AAIJ
not seen
95 145 ± 139
21AE LHCB p p at 7, 8, 13 TeV
1 No significant signal is seen in the mass range 3.4–3.8 GeV . AAIJ 21AE performs acombined fit to its Ξ + → Ξ + π + π − data and the Ξ + → Λ+ K − π + data fromccccccAAIJ 20AX, finding a global significance of 2.9 σ (4.0 σ local).

Ξ+cc REFERENCES
AAIJ
21AE JHEP 2112 107
AAIJ
20AX SCPMA 63 221062
KATO
14
PR D89 052003
AAIJ
13CD JHEP 1312 090
AUBERT,B
06D PR D74 011103
CHISTOV06
PRL 97 162001
OCHERASHVI...05
PL B628 18
MATTSON02
PRL 89 112001

https://pdg.lbl.gov

R. Aaij et al.
R. Aaij et al.
Y. Kato et al.
R. Aaij et al.
B. Aubert et al.
R. Chistov et al.
A. Ocherashvili et al.
M. Mattson et al.

Page 2(LHCb Collab.)(LHCb Collab.)(BELLE Collab.)(LHCb Collab.)(BABAR Collab.)(BELLE Collab.)(FNAL SELEX Collab.)(FNAL SELEX Collab.)

Created: 5/31/2024 10:16