Observation of Two New Excited $\Xi_b^0$ States Decaying to $\Lambda^0_b K^- \pi^+$ - INSPIRE

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Observation of Two New Excited $\Xi_b^0$ States Decaying to $\Lambda^0_b K^- \pi^+$

LHCb

Collaboration

Oct 9, 2021

20 pages

Published in:

Phys.Rev.Lett. 128 (2022) 16, 162001

Published: Apr 21, 2022

e-Print:

2110.04497 [hep-ex]

DOI:

10.1103/PhysRevLett.128.162001 (publication)

PDG:

{{\mathit \Xi}_{{{b}}}{(6327)}^{0}}

\rightarrow

{{\mathit \Lambda}_{{{b}}}^{0}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}

Report number:

LHCb-PAPER-2021-025,
CERN-EP-2021-188

Experiments:

CERN-LHC-LHCb

View in:

reference search38 citations

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Abstract: (APS)

Two narrow resonant states are observed in the

Λ_{b}^{0} K^{-} π^{+}

mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of

6 {fb}^{- 1}

. The minimal quark content of the

Λ_{b}^{0} K^{-} π^{+}

system indicates that these are excited

Ξ_{b}^{0}

baryons. The masses of the

Ξ_{b} (6327)^{0}

and

Ξ_{b} (6333)^{0}

states are

m [Ξ_{b} (6327)^{0}] = 6327.2 8_{- 0.21}^{+ 0.23} \pm 0.12 \pm 0.24

and

m [Ξ_{b} (6333)^{0}] = 6332.6 9_{- 0.18}^{+ 0.17} \pm 0.03 \pm 0.22 MeV

, respectively, with a mass splitting of

Δ m = 5.4 1_{- 0.27}^{+ 0.26} \pm 0.12 MeV

, where the uncertainties are statistical, systematic, and due to the

Λ_{b}^{0}

mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of

Γ [Ξ_{b} (6327)^{0}] < 2.20 (2.56)

and

Γ [Ξ_{b} (6333)^{0}] < 1.60 (1.92) MeV

at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of

1 D

Ξ_{b}^{0}

resonances.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-025.html

p p: scattering
p p: colliding beams
resonance: production
baryon: excited state
Xi/b0: excited state
doublet
mass difference
intermediate state
mass: width
resonance: mass: measured

References(56)

Figures(6)

[1]

A Schematic Model of Baryons and Mesons

Murray Gell-Mann
(
- Caltech
)

- Phys.Lett. 8 (1964) 214-215,
- Also in *Lichtenberg, D.B. (ed.), Rosen, S.P., (ed.), Developments In The Quark Theory Of Hadrons, Vol. 1*, 20-21
•
DOI:
- 10.1016/S0031-9163(64)92001-3

[2]

An

G. Zweig

[3]

Baryon spectroscopy

Eberhard Klempt
(
- Bonn U., HISKP
)
,
Jean-Marc Richard
(
- LPSC, Grenoble
)

- Rev.Mod.Phys. 82 (2010) 1095-1153
•
e-Print:
- 0901.2055
•
DOI:
- 10.1103/RevModPhys.82.1095

[4]

Review of Particle Physics

et al.

- PTEP 2020 (2020) 8, 083C01
•
DOI:
- 10.1093/ptep/ptaa104

[5]

Interpretation of the observed $\Lambda_b(6146)^0$ and $\Lambda_b(6152)^0$ states as 1 $D$ bottom baryons

Bing Chen
(
- AHSTU, Fengyang and
- Lanzhou U. and
- Lanzhou, Inst. Modern Phys.
)
,
Si-Qiang Luo
(
- Lanzhou U. and
- Lanzhou, Inst. Modern Phys.
)
,
Xiang Liu
(
- Lanzhou U. and
- Lanzhou, Inst. Modern Phys.
)
,
Takayuki Matsuki
(
- Tokyo Kasei U. and
- Nishina Ctr., RIKEN
)

- Phys.Rev.D 100 (2019) 9, 094032
•
e-Print:
- 1910.03318
•
DOI:
- 10.1103/PhysRevD.100.094032

[6]

Role of newly discovered $\Xi_b(6227)^-$ for constructing excited bottom baryon family

Bing Chen
(
- Anyang Norm U. and
- Lanzhou U. and
- Lanzhou, Inst. Modern Phys.
)
,
Ke-Wei Wei
(
- Anyang Norm U.
)
,
Xiang Liu
(
- Lanzhou U. and
- Lanzhou, Inst. Modern Phys.
)
,
Ailin Zhang
(
- Shanghai U.
)

- Phys.Rev.D 98 (2018) 3, 031502
•
e-Print:
- 1805.10826
•
DOI:
- 10.1103/PhysRevD.98.031502

[7]

Assigning the newly reported $\Sigma_b(6097)$ as a $P$ -wave excited state and predicting its partners

Bing Chen
(
- Anyang Norm U. and
- Lanzhou U.
)
,
Xiang Liu
(
- Lanzhou U.
)

- Phys.Rev.D 98 (2018) 7, 074032
•
e-Print:
- 1810.00389
•
DOI:
- 10.1103/PhysRevD.98.074032

[8]

Spectroscopy and Regge trajectories of heavy baryons in the relativistic quark-diquark picture

D. Ebert
(
- Humboldt U., Berlin
)
,
R.N. Faustov
(
- Humboldt U., Berlin and
- Moscow, Computing Ctr.
)
,
V.O. Galkin
(
- Humboldt U., Berlin and
- Moscow, Computing Ctr.
)

- Phys.Rev.D 84 (2011) 014025
•
e-Print:
- 1105.0583
•
DOI:
- 10.1103/PhysRevD.84.014025

[9]

Strong and radiative decays of the low-lying $D$ -wave singly heavy baryons

Ya-Xiong Yao
(
- Hunan, LDQSQC and
- Hunan Normal U.
)
,
Kai-Lei Wang
(
- Hunan, LDQSQC and
- Hunan Normal U.
)
,
Xian-Hui Zhong
(
- Hunan, LDQSQC and
- Hunan Normal U.
)

- Phys.Rev.D 98 (2018) 7, 076015
•
e-Print:
- 1803.00364
•
DOI:
- 10.1103/PhysRevD.98.076015

[10]

Masses of excited heavy baryons in the relativistic quark model

D. Ebert
(
- Humboldt U., Berlin
)
,
R.N. Faustov
(
- Humboldt U., Berlin and
- Moscow, Computing Ctr.
)
,
V.O. Galkin
(
- Humboldt U., Berlin and
- Moscow, Computing Ctr.
)

- Phys.Lett.B 659 (2008) 612-620
•
e-Print:
- 0705.2957
•
DOI:
- 10.1016/j.physletb.2007.11.037

[11]

Heavy baryons in a quark model

W. Roberts
(
- Florida State U.
)
,
Muslema Pervin
(
- Argonne, PHY
)

- Int.J.Mod.Phys.A 23 (2008) 2817-2860
•
e-Print:
- 0711.2492
•
DOI:
- 10.1142/S0217751X08041219

[12]

Assignments of $\Lambda_Q$ and $\Xi_Q$ baryons in the heavy quark-light diquark picture

- Eur.Phys.J.A 51 (2015) 82
•
e-Print:
- 1406.6561
•
DOI:
- 10.1140/epja/i2015-15082-3

[13]

Strong and radiative decays of the low-lying $S$ - and $P$ -wave singly heavy baryons

Kai-Lei Wang
(
- Hunan Normal U. and
- Hunan, LDQSQC
)
,
Ya-Xiong Yao
(
- Hunan Normal U. and
- Hunan, LDQSQC
)
,
Xian-Hui Zhong
(
- Hunan Normal U. and
- Hunan, LDQSQC
)
,
Qiang Zhao
(
)

- Phys.Rev.D 96 (2017) 11, 116016
•
e-Print:
- 1709.04268
•
DOI:
- 10.1103/PhysRevD.96.116016

[14]

Singly heavy baryons with chiral partner structure in a three-flavor chiral model

Yohei Kawakami
(
- Nagoya U.
)
,
Masayasu Harada
(
- Nagoya U.
)

- Phys.Rev.D 99 (2019) 9, 094016
•
e-Print:
- 1902.06774
•
DOI:
- 10.1103/PhysRevD.99.094016

[15]

Observation of excited $\Lambda_b^0$ baryons

LHCb

Collaboration

•

R Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 109 (2012) 172003
•
e-Print:
- 1205.3452
•
DOI:
- 10.1103/PhysRevLett.109.172003

[16]

Observation of New Resonances in the $\Lambda_{b}^0\pi^+\pi^-$ System

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 123 (2019) 15, 152001
•
e-Print:
- 1907.13598
•
DOI:
- 10.1103/PhysRevLett.123.152001

[17]

Observation of a new baryon state in the ${\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-}$ mass spectrum

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- JHEP 06 (2020) 136
•
e-Print:
- 2002.05112
•
DOI:
- 10.1007/JHEP06(2020)136

[18]

Observation of a new $\Xi_b^-$ resonance

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 121 (2018) 7, 072002
•
e-Print:
- 1805.09418
•
DOI:
- 10.1103/PhysRevLett.121.072002

[19]

Observation of a new $\Xi_b^0$ state

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.D 103 (2021) 1, 012004
•
e-Print:
- 2010.14485
•
DOI:
- 10.1103/PhysRevD.103.012004

[20]

Observation of a New Excited Beauty Strange Baryon Decaying to $\Xi^-_\mathrm{b} \pi^+ \pi^-$

CMS

Collaboration

•

Albert M Sirunyan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.Lett. 126 (2021) 25, 252003
•
e-Print:
- 2102.04524
•
DOI:
- 10.1103/PhysRevLett.126.252003

[21]

The LHCb Detector at the LHC

LHCb

Collaboration

•

A.Augusto Alves, Jr.
(
- Rio de Janeiro, CBPF
)

et al.

- JINST 3 (2008) S08005
•
DOI:
- 10.1088/1748-0221/3/08/S08005

[22]

LHCb Detector Performance

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Int.J.Mod.Phys.A 30 (2015) 07, 1530022
•
e-Print:
- 1412.6352
•
DOI:
- 10.1142/S0217751X15300227

[23]

Performance of the LHCb Vertex Locator

et al.

- JINST 9 (2014) P09007
•
e-Print:
- 1405.7808
•
DOI:
- 10.1088/1748-0221/9/09/P09007

[24]

Performance of the LHCb Outer Tracker

et al.

- JINST 9 (2014) 01, P01002
•
e-Print:
- 1311.3893
•
DOI:
- 10.1088/1748-0221/9/01/P01002

[25]

Measurement of the $\Lambda_b^0$ , $\Xi_b^-$ and $\Omega_b^-$ baryon masses

LHCb

Collaboration

•

R Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 110 (2013) 18, 182001
•
e-Print:
- 1302.1072
•
DOI:
- 10.1103/PhysRevLett.110.182001

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