${{\mathit \Lambda}_{{{b}}}^{0}}$ MASS

${\mathit m}_{{{\mathit \Lambda}_{{{b}}}^{0}}}$

INSPIRE   JSON  (beta) PDGID:
S040M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 5619.57 \pm0.16}$ OUR AVERAGE
$5619.34$ $\pm0.06$ $\pm0.47$ 1
AAIJ
2024V
 
LHCB ${{\mathit p}}{{\mathit p}}$ at 13 TeV
$5619.62$ $\pm0.16$ $\pm0.13$ 2
AAIJ
2017AM
 
LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$5619.30$ $\pm0.34$ 3
AAIJ
2014AA
 
LHCB ${{\mathit p}}{{\mathit p}}$ at 7 TeV
$5620.15$ $\pm0.31$ $\pm0.47$ 4
AALTONEN
2014B
 
CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV
$5619.7$ $\pm0.7$ $\pm1.1$ 4
AAD
2013U
 
ATLS ${{\mathit p}}{{\mathit p}}$ at 7 TeV
$5621$ $\pm4$ $\pm3$ 5
ABE
1997B
 
CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at $1.8$ TeV
$5668$ $\pm16$ $\pm8$ 4 6
ABREU
1996N
 
DLPH ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
$5614$ $\pm21$ $\pm4$ 4 6
BUSKULIC
1996L
 
ALEP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$5619.65$ $\pm0.17$ $\pm0.17$ 7
AAIJ
2016Y
 
LHCB Repl. by AAIJ 2017AM
$5619.44$ $\pm0.13$ $\pm0.38$ 4
AAIJ
2013AV
 
LHCB Repl. by AAIJ 2017AM
$5619.19$ $\pm0.70$ $\pm0.30$ 4
AAIJ
2012E
 
LHCB Repl. by AAIJ 2013AV
$5619.7$ $\pm1.2$ $\pm1.2$ 8
ACOSTA
2006
 
CDF Repl. by AALTONEN 2014B
not seen 9
ABE
1993B
 
CDF Repl. by ABE 1997B
$5640$ $\pm50$ $\pm30$ 16 10
ALBAJAR
1991E
 
UA1 ${{\mathit p}}{{\overline{\mathit p}}}$ 630 GeV
$5640$ ${}^{+100}_{-210}$ 52
BARI
1991
 
SFM ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit D}^{0}}{{\mathit \pi}^{-}}$
$5650$ ${}^{+150}_{-200}$ 90
BARI
1991
 
SFM ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$
1  Uses ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit D}_{{{s}}}^{-}}$ decays.
2  Uses ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit \chi}_{{{c1}}}}{{\mathit p}}{{\mathit K}^{-}}$, ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit \chi}_{{{c2}}}}{{\mathit p}}{{\mathit K}^{-}}$, ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$, ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \psi}{(2S)}}{{\mathit K}^{-}}$, ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}$, and ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit J / \psi}}{{\mathit K}^{-}}$ decays.
3  Uses exclusively reconstructed final states ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit D}_{{{s}}}^{-}}$ , ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit D}^{-}}$ and ${{\overline{\mathit B}}^{0}}$ $\rightarrow$ ${{\mathit D}^{+}}{{\mathit D}_{{{s}}}^{-}}$ decays. The uncertainty includes both statistical and systematic contributions.
4  Uses ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ fully reconstructed decays.
5  ABE 1997B observed 38 events with a background of $18$ $\pm1.6$ events in the mass range $5.60 - 5.65$ ${\mathrm {GeV/}}\mathit c{}^{2}$, a significance of $>3.4$ standard deviations.
6  Uses 4 fully reconstructed ${{\mathit \Lambda}_{{{b}}}}$ events.
7  Uses ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \psi}{(2S)}}{{\mathit K}^{-}}$, ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}$, and ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit J / \psi}}{{\mathit K}^{-}}$ decays.
8  Uses exclusively reconstructed final states containing a ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ decays.
9  ABE 1993B states that, based on the signal claimed by ALBAJAR 1991E, CDF should have found $30$ $\pm23$ ${{\mathit \Lambda}_{{{b}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \Lambda}}$ events. Instead, CDF found not more than 2 events.
10  ALBAJAR 1991E claims $16$ $\pm5$ events above a background of $9$ $\pm1$ events, a significance of about 5 standard deviations.
References