Puzzle of the $\Lambda_c$ Spectrum

Lü, Qi-Fang; Dong, Yubing; Liu, Xiang; Matsuki, Takayuki

doi:10.11804/NuclPhysRev.35.01.001

Puzzle of the $\Lambda_c$ Spectrum

Qi-Fang Lü
(
- Beijing, Inst. High Energy Phys.
)
,
Yubing Dong
(
- Beijing, Inst. High Energy Phys. and
- TPCSF, Beijing
)
,
Xiang Liu
(
- Lanzhou, Inst. Modern Phys. and
- Lanzhou U.
)
,
Takayuki Matsuki
(
- Nishina Ctr., RIKEN and
- Tokyo Kasei U.
)

Oct 30, 2016

3 pages

Published in:

Nucl.Phys.Rev. 35 (2018) 1, 1-4

Published: Mar 20, 2018

e-Print:

1610.09605 [hep-ph]

DOI:

10.11804/NuclPhysRev.35.01.001

View in:

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Abstract: (Chinese Academy of Sciences)

There is a puzzle in the Λ

_{c}^{+}

family,

i.e.

, one member with J^{$P$}=3/2

^{+}

is missing in a

L

=2 multiplet which the heavy quark effective theory predicts, and J^{$P$}'s of Λ

_{c}

(2765)

^{+}

and Λ

_{c}

(2940)

^{+}

are unknown. Using a light diquark picture to calculate baryon masses, we study possible assignments of two Λ

_{c}

's with unknown J^{$P$} and the missing Λ

_{c}^{+}

with 3/2

^{+}

for

L

=2, and we find the most probable possibility that the peak corresponding to Λ

_{c}

(2880)

^{+}

actually includes a missing member with spin 3/2

^{+}

for

L

=2 and that quantum numbers of Λ

_{c}

(2765)

^{+}

and Λ

_{c}

(2940)

^{+}

are 2

S

(1/2

^{+}

) and 2

P

(1/2

^{-}

), respectively.

Note:

3 pages, 3 tables

&Lambda
$_{c}$ family
relativized quark model
diquark
baryon: mass
Lambda/c+: mass spectrum
baryon: spin
Heavy Quark Effective Theory
Lambda/c(2765): mass
Lambda/c(2880): mass

References(18)

Figures(0)

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Puzzle of the Λc\Lambda_cΛc​ Spectrum

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Puzzle of the $\Lambda_c$ Spectrum