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${{\mathit \Lambda}_{{b}}^{0}}$ MEAN LIFE

INSPIRE   PDGID:

S040T

See ${{\mathit b}}$-baryon Admixture section for data on ${{\mathit b}}$-baryon mean life average over species of ${{\mathit b}}$-baryon particles.

“OUR EVALUATION” is an average using rescaled values of the data listed below. The average and rescaling were performed by the Heavy Flavor Averaging Group (HFLAV) and are described at https://hflav.web.cern.ch/. The averaging/rescaling procedure takes into account correlations between the measurements and asymmetric lifetime errors.

VALUE ($ 10^{-12} $ s) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1.471 \pm0.009}$ OUR EVALUATION $1.477$ $\pm0.027$ $\pm0.009$ 1 SIRUNYAN 2018 BY CMS ${{\mathit p}}{{\mathit p}}$ at 8 TeV $1.415$ $\pm0.027$ $\pm0.006$ 2 AAIJ 2014 E LHCB ${{\mathit p}}{{\mathit p}}$ at 7 TeV $1.479$ $\pm0.009$ $\pm0.010$ 3 AAIJ 2014 U LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV $1.565$ $\pm0.035$ $\pm0.020$ 2 AALTONEN 2014 B CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV $1.449$ $\pm0.036$ $\pm0.017$ 2 AAD 2013 U ATLS ${{\mathit p}}{{\mathit p}}$ at 7 TeV $1.503$ $\pm0.052$ $\pm0.031$ 2 CHATRCHYAN 2013 AC CMS ${{\mathit p}}{{\mathit p}}$ at 7 TeV $1.303$ $\pm0.075$ $\pm0.035$ 2 ABAZOV 2012 U D0 ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV $1.401$ $\pm0.046$ $\pm0.035$ 4 AALTONEN 2010 B CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV $1.27$ ${}^{+0.35}_{-0.29}$ $\pm0.09$ ABREU 1995 S DLPH Excess ${{\mathit p}}{{\mathit \mu}^{-}}$ , decay lengths • • We do not use the following data for averages, fits, limits, etc. • • $1.482$ $\pm0.018$ $\pm0.012$ 5 AAIJ 2013 BB LHCB Repl. by AAIJ 2014U $1.537$ $\pm0.045$ $\pm0.014$ 2 AALTONEN 2011 CDF Repl. by AALTONEN 2014B $1.218$ ${}^{+0.130}_{-0.115}$ $\pm0.042$ 2 ABAZOV 2007 S D0 Repl. by ABAZOV 2012U $1.290$ ${}^{+0.119}_{-0.110}$ ${}^{+0.087}_{-0.091}$ 6 ABAZOV 2007 U D0 ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV $1.593$ ${}^{+0.083}_{-0.078}$ $\pm0.033$ 2 ABULENCIA 2007 A CDF Repl. by AALTONEN 2011 $1.22$ ${}^{+0.22}_{-0.18}$ $\pm0.04$ 2 ABAZOV 2005 C D0 Repl. by ABAZOV 2007S $1.11$ ${}^{+0.19}_{-0.18}$ $\pm0.05$ 7 ABREU 1999 W DLPH ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $1.29$ ${}^{+0.24}_{-0.22}$ $\pm0.06$ 7 ACKERSTAFF 1998 G OPAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $1.21$ $\pm0.11$ 7 BARATE 1998 D ALEP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$ $1.32$ $\pm0.15$ $\pm0.07$ 8 ABE 1996 M CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.8 TeV $1.19$ ${}^{+0.21}_{-0.18}$ ${}^{+0.07}_{-0.08}$ ABREU 1996 D DLPH Repl. by ABREU 1999W $1.14$ ${}^{+0.22}_{-0.19}$ $\pm0.07$ 69 AKERS 1995 K OPAL Repl. by ACKERSTAFF 1998G $1.02$ ${}^{+0.23}_{-0.18}$ $\pm0.06$ 44 BUSKULIC 1995 L ALEP Repl. by BARATE 1998D 1  Measured using ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ decays. 2  Measured mean life using fully reconstructed ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ decays. 3  Used ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit p}}{{\mathit K}^{-}}$ decays. 4  Measured mean life using fully reconstructed ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \pi}^{-}}$ decays. 5  Measured the lifetime ratio of decays ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit p}}{{\mathit K}^{-}}$ to ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit K}^{-}}$ to be $0.976$ $\pm0.012$ $\pm0.006$ with ${\mathit \tau}_{{{\mathit B}^{0}}}$ = $1.519$ $\pm0.007$ ps. 6  Measured using semileptonic decays ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \mu}}{{\mathit \nu}}{{\mathit X}}$ and ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit p}}$ . 7  Measured using ${{\mathit \Lambda}_{{c}}}{{\mathit \ell}^{-}}$ and ${{\mathit \Lambda}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ . 8  Excess ${{\mathit \Lambda}_{{c}}}{{\mathit \ell}^{-}}$ , decay lengths.

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 AALTONEN 2014B PR D89 072014 Mass and Lifetime Measurements of Bottom and Charm Baryons in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV 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 CHATRCHYAN 2013AC JHEP 1307 163 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV 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 AALTONEN 2010B PRL 104 102002 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime in ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \pi}^{-}}$ Decays 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 ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ ABAZOV 2007U PRL 99 182001 Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime using Semileptonic Decays 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 ABREU 1999W EPJ C10 185 Measurement of the Lifetime of ${\mathit {\mathit b}}$ Baryons ACKERSTAFF 1998G PL B426 161 Measurements of the ${{\mathit B}_{{s}}}$ and ${{\mathit \Lambda}_{{b}}}$ Lifetimes BARATE 1998D EPJ C2 197 Measurement of the ${\mathit {\mathit b}}$ Baryon Lifetime and Branching Fractions in ${{\mathit Z}}$ Decays ABE 1996M PRL 77 1439 Measurement of ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime using ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \ell}^{-}}{{\overline{\mathit \nu}}}$ ABREU 1996D ZPHY C71 199 Determination of the Average Lifetime of ${{\mathit b}}$-Baryons ABREU 1995S ZPHY C68 375 Lifetime and Production Rate of Beauty Baryons from ${{\mathit Z}}$ Decays AKERS 1995K PL B353 402 A Measurement of the ${{\mathit \Lambda}_{{b}}^{0}}$ Lifetime BUSKULIC 1995L PL B357 685 Measurements of the ${{\mathit b}}$ Baryon Lifetime