${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}/{\mathit \tau}_{{{\mathit B}^{0}}}$ MEAN LIFE RATIO

${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}/{\mathit \tau}_{{{\mathit B}^{0}}}$ (direct measurements)

INSPIRE   PDGID:
S040TR
“OUR EVALUATION” has been obtained by the Heavy Flavor Averaging Group (HFLAV) by including both ${{\mathit B}^{0}}$ and ${{\mathit B}^{+}}$ decays.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 0.964 \pm0.007}$ OUR EVALUATION  See the ideogram below.
$\bf{ 0.970 \pm0.009}$ OUR AVERAGE  Error includes scale factor of 1.4.  See the ideogram below.
$0.978$ $\pm0.018$ $\pm0.006$ 1
SIRUNYAN
2018BY
 CMS ${{\mathit p}}{{\mathit p}}$ at 8 TeV
$0.929$ $\pm0.018$ $\pm0.004$ 1
AAIJ
2014E
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7 TeV
$0.974$ $\pm0.006$ $\pm0.004$ 2
AAIJ
2014U
 LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$0.960$ $\pm0.025$ $\pm0.016$ 3
AAD
2013U
 ATLS ${{\mathit p}}{{\mathit p}}$ at 7 TeV
$0.864$ $\pm0.052$ $\pm0.033$ 4, 5
ABAZOV
2012U
 D0 ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV
$1.020$ $\pm0.030$ $\pm0.008$ 4
AALTONEN
2011
CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV
• • We do not use the following data for averages, fits, limits, etc. • •
$0.976$ $\pm0.012$ $\pm0.006$ 6
AAIJ
2013BB
 LHCB Repl. by AAIJ 2014U
$0.811$ ${}^{+0.096}_{-0.087}$ $\pm0.034$ 4, 5
ABAZOV
2007S
 D0 Repl. by ABAZOV 2012U
$1.041$ $\pm0.057$ 7
ABULENCIA
2007A
 CDF Repl. by AALTONEN 2011
$0.87$ ${}^{+0.17}_{-0.14}$ $\pm0.03$ 7
ABAZOV
2005C
 D0 Repl. by ABAZOV 2007S
1  Measured using ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{*}{(892)}^{0}}$ decays.
2  Used ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit p}}{{\mathit K}^{-}}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{*}{(892)}^{0}}$ decays.
3  Measured with ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}$ ( ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) ${{\mathit \Lambda}^{0}}$( ${{\mathit p}}{{\mathit \pi}^{-}}$ ) decays.
4  Uses fully reconstructed ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ decays.
5  Uses ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ decays for denominator.
6  Measures 1/${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}$ $−$ 1/${\mathit \tau}_{{{\mathit B}^{0}}}$ and uses ${\mathit \tau}_{{{\mathit B}^{0}}}$ = $1.519$ $\pm0.007$ ps to extract lifetime ratio.
7  Measured mean life ratio using fully reconstructed decays.

           ${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}/{\mathit \tau}_{{{\mathit B}^{0}}}$ (direct measurements)
References:
SIRUNYAN 2018BY
EPJ C78 457 Measurement of b hadron lifetimes in pp collisions at $\sqrt{s} =$ 8 TeV
AAIJ 2014E
JHEP 1404 114 Measurements of the ${{\mathit B}^{+}},{{\mathit B}^{0}},{{\mathit B}_{{s}}^{0}}$ Meson and ${{\mathit \Lambda}_{{b}}^{0}}$ Baryon Lifetimes
AAIJ 2014U
PL B734 122 Precision Measurement of the Ratio of the ${{\mathit \Lambda}_{{b}}^{0}}$ to ${{\overline{\mathit B}}^{0}}$ Lifetimes
AAD 2013U
PR D87 032002 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime and Mass in the ATLAS Experiment
AAIJ 2013BB
PRL 111 102003 Precision Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Baryon Lifetime
ABAZOV 2012U
PR D85 112003 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime in the Exclusive Decay ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}^{0}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
AALTONEN 2011
PRL 106 121804 Measurement of ${\mathit {\mathit b}}$ Hadron Lifetimes in Exclusive Decays Containing a ${{\mathit J / \psi}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABAZOV 2007S
PRL 99 142001 Measurement of the ${{\mathit \Lambda}_{{b}}}$ Lifetime in the Exclusive Decay ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$
ABULENCIA 2007A
PRL 98 122001 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime in ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}^{0}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
ABAZOV 2005C
PRL 94 102001 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime in the Decay $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}^{0}}$ with the ${D0}$ Detector