GAUGE AND HIGGS BOSONS
INSPIRE search

${{\boldsymbol Z}}$ $J$ = $1$

See related reviews:
${{\mathit Z}}$ Boson
Anomalous ${{\mathit Z}}{{\mathit Z}}{{\mathit \gamma}}$ , ${{\mathit Z}}{{\mathit \gamma}}{{\mathit \gamma}}$ , and ${{\mathit Z}}{{\mathit Z}}{{\mathit V}}$ Couplings
Anomalous ${{\mathit W}}/{{\mathit Z}}$ Quartic Couplings (QGCs)
${{\mathit Z}}$ MASS   $91.1876 \pm0.0021$ GeV 
${{\mathit Z}}$ WIDTH   $2.4952 \pm0.0023$ GeV 
AVERAGE PARTICLE MULTIPLICITIES IN HADRONIC ${{\boldsymbol Z}}$ DECAY
$\langle{}\mathit N_{{{\mathit \gamma}}}\rangle{}$   $21.0 \pm1.2$  
$\langle{}\mathit N_{{{\mathit \pi}^{\pm}}}\rangle{}$   $17.03 \pm0.16$  
$\langle{}\mathit N_{{{\mathit \pi}^{0}}}\rangle{}$   $9.76 \pm0.26$  
$\langle{}\mathit N_{{{\mathit \eta}}}\rangle{}$   $1.01 \pm0.08$  (S = 1.3)
$\langle{}\mathit N_{{{\mathit \rho}^{\pm}}}\rangle{}$   $2.57 \pm0.15$  
$\langle{}\mathit N_{{{\mathit \rho}^{0}}}\rangle{}$   $1.24 \pm0.10$  (S = 1.1)
$\langle{}\mathit N_{{{\mathit \omega}}}\rangle{}$   $1.02 \pm0.06$  
$\langle{}\mathit N_{{{\mathit \eta}^{\,'}}}\rangle{}$   $0.17 \pm0.05$  (S = 2.4)
$\langle{}\mathit N_{{{\mathit f}_{{0}}{(980)}}}\rangle{}$   $0.147 \pm0.011$  
$\langle{}\mathit N_{{{\mathit a}_{{0}}{(980)}^{\pm}}}\rangle{}$   $0.27 \pm0.11$  
$\langle{}\mathit N_{{{\mathit \phi}}}\rangle{}$   $0.098 \pm0.006$  (S = 2.0)
$\langle{}\mathit N_{{{\mathit f}_{{2}}{(1270)}}}\rangle{}$   $0.169 \pm0.025$  (S = 1.4)
$\langle{}\mathit N_{{{\mathit f}_{{1}}{(1285)}}}\rangle{}$   $0.17 \pm0.05$  
$\langle{}\mathit N_{{{\mathit f}_{{1}}{(1420)}}}\rangle{}$   $0.056 \pm0.012$  
$\langle{}\mathit N_{{{\mathit f}_{{2}}^{\,'}{(1525)}}}\rangle{}$   $0.012 \pm0.006$  
$\langle{}\mathit N_{{{\mathit K}^{\pm}}}\rangle{}$   $2.24 \pm0.04$  
$\langle{}\mathit N_{{{\mathit K}^{0}}}\rangle{}$   $2.039 \pm0.025$  (S = 1.3)
$\langle{}\mathit N_{{{\mathit K}^{*}{(892)}^{\pm}}}\rangle{}$   $0.72 \pm0.05$  
$\langle{}\mathit N_{{{\mathit K}^{*}{(892)}^{0}}}\rangle{}$   $0.739 \pm0.022$  
$\langle{}\mathit N_{{{\mathit K}_{{2}}^{*}{(1430)}}}\rangle{}$   $0.073 \pm0.023$  
$\langle{}\mathit N_{{{\mathit D}^{\pm}}}\rangle{}$   $0.187 \pm0.020$  (S = 1.5)
$\langle{}\mathit N_{{{\mathit D}^{0}}}\rangle{}$   $0.462 \pm0.026$  
$\langle{}\mathit N_{{{\mathit D}_{{s}}^{\pm}}}\rangle{}$   $0.131 \pm0.021$  
$\langle{}\mathit N_{{{\mathit D}^{*}{(2010)}^{\pm}}}\rangle{}$   $0.183 \pm0.008$  
$\langle{}\mathit N_{{{\mathit D}_{{s1}}{(2536)}^{+}}}\rangle{}$
$\langle{}\mathit N_{{{\mathit B}^{*}}}\rangle{}$   $0.28 \pm0.032$  
$\langle{}\mathit N_{{{\mathit J / \psi}{(1S)}}}\rangle{}$   $0.0056 \pm0.0005$  
$\langle{}\mathit N_{{{\mathit \psi}{(2S)}}}\rangle{}$   $0.0023 \pm0.0005$  
$\langle{}\mathit N_{{{\mathit p}}}\rangle{}$   $1.046 \pm0.026$  
$\langle{}\mathit N_{{{\mathit \Delta}{(1232)}^{++}}}\rangle{}$   $0.087 \pm0.033$  (S = 2.4)
$\langle{}\mathit N_{{{\mathit \Lambda}}}\rangle{}$   $0.388 \pm0.009$  (S = 1.7)
$\langle{}\mathit N_{{{\mathit \Lambda}{(1520)}}}\rangle{}$   $0.0224 \pm0.0027$  
$\langle{}\mathit N_{{{\mathit \Sigma}^{+}}}\rangle{}$   $0.107 \pm0.010$  
$\langle{}\mathit N_{{{\mathit \Sigma}^{-}}}\rangle{}$   $0.082 \pm0.007$  
$\langle{}\mathit N_{{{\mathit \Sigma}^{+}} + {{\mathit \Sigma}^{-}}}\rangle{}$   $0.181 \pm0.018$  
$\langle{}\mathit N_{{{\mathit \Sigma}^{0}}}\rangle{}$   $0.076 \pm0.010$  
$\langle{}\mathit N_{({{\mathit \Sigma}^{+}} + {{\mathit \Sigma}^{-}} + {{\mathit \Sigma}^{0}})/3}\rangle{}$   $0.084 \pm0.009$  
$\langle{}\mathit N_{{{\mathit \Sigma}{(1385)}^{+}}}\rangle{}$   $0.0239 \pm0.0015$  
$\langle{}\mathit N_{{{\mathit \Sigma}{(1385)}^{-}}}\rangle{}$   $0.0240 \pm0.0017$  
$\langle{}\mathit N_{{{\mathit \Sigma}{(1385)}^{+}} + {{\mathit \Sigma}{(1385)}^{-}}}\rangle{}$   $0.046 \pm0.004$  (S = 1.6)
$\langle{}\mathit N_{{{\mathit \Xi}^{-}}}\rangle{}$   $0.0258 \pm0.0009$  
$\langle{}\mathit N_{{{\mathit \Xi}{(1530)}^{0}}}\rangle{}$   $0.0059 \pm0.0011$  (S = 2.3)
$\langle{}\mathit N_{{{\mathit \Omega}^{-}}}\rangle{}$   $0.00164 \pm0.00028$  
$\langle{}\mathit N_{{{\mathit \Lambda}_{{c}}^{+}}}\rangle{}$   $0.078 \pm0.017$  
$\langle{}\mathit N_{{{\overline{\mathit D}}}}\rangle{}$
$\langle{}\mathit N_{\mathit charged}\rangle{}$   $20.76 \pm0.16$  (S = 2.1)
${{\mathit Z}}$ HADRONIC POLE CROSS SECTION   $41.541 \pm0.037$ nb 
${{\boldsymbol Z}}$ VECTOR COUPLINGS
$\mathit g{}^{{{\mathit e}}}_{\mathit V}$   $-0.03817 \pm0.00047$  
$\mathit g{}^{{{\mathit \mu}}}_{\mathit V}$   $-0.0367 \pm0.0023$  
$\mathit g{}^{{{\mathit \tau}}}_{\mathit V}$   $-0.0366 \pm0.0010$  
$\mathit g{}^{{{\mathit \ell}}}_{\mathit V}$   $-0.03783 \pm0.00041$  
$\mathit g{}^{{{\mathit u}}}_{\mathit V}$   $0.18 \pm0.05$  
$\mathit g{}^{{{\mathit d}}}_{\mathit V}$   $-0.35 {}^{+0.05}_{-0.06}$  
${{\boldsymbol Z}}$ AXIAL-VECTOR COUPLINGS
$\mathit g{}^{{{\mathit e}}}_{\mathit A}$   $-0.50111 \pm0.00035$  
$\mathit g{}^{{{\mathit \mu}}}_{\mathit A}$   $-0.50120 \pm0.00054$  
$\mathit g{}^{{{\mathit \tau}}}_{\mathit A}$   $-0.50204 \pm0.00064$  
$\mathit g{}^{{{\mathit \ell}}}_{\mathit A}$   $-0.50123 \pm0.00026$  
$\mathit g{}^{{{\mathit u}}}_{\mathit A}$   $0.50 {}^{+0.04}_{-0.05}$  
$\mathit g{}^{{{\mathit d}}}_{\mathit A}$   $-0.514 {}^{+0.050}_{-0.029}$  
${{\boldsymbol Z}}$ COUPLINGS TO NEUTRAL LEPTONS
$\mathit g{}^{{{\mathit \nu}_{{{{\mathit \ell}}}}}}$   $0.5008 \pm0.0008$  
$\mathit g{}^{{{\mathit \nu}_{{e}}}}$   $0.53 \pm0.09$  
$\mathit g{}^{{{\mathit \nu}_{{\mu}}}}$   $0.502 \pm0.017$  
${{\boldsymbol Z}}$ ASYMMETRY PARAMETERS
$\mathit A_{{{\mathit e}}}$   $0.1515 \pm0.0019$  
$\mathit A_{{{\mathit \mu}}}$   $0.142 \pm0.015$  
$\mathit A_{{{\mathit \tau}}}$   $0.143 \pm0.004$  
$\mathit A_{{{\mathit s}}}$   $0.90 \pm0.09$  
$\mathit A_{{{\mathit c}}}$   $0.670 \pm0.027$  
$\mathit A_{{{\mathit b}}}$   $0.923 \pm0.020$  
TRANSVERSE SPIN CORRELATIONS IN ${{\boldsymbol Z}}$ $\rightarrow$ ${{\boldsymbol \tau}^{+}}{{\boldsymbol \tau}^{-}}$
$\mathit C_{\mathit TT}$   $1.01 \pm0.12$  
$\mathit C_{\mathit TN}$   $0.08 \pm0.14$  
FORWARD-BACKWARD ${{\boldsymbol e}^{+}}$ ${{\boldsymbol e}^{-}}$ $\rightarrow$ ${{\boldsymbol f}}{{\overline{\boldsymbol f}}}$ CHARGE ASYMMETRIES
$\mathit A{}^{(0,{{\mathit e}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$   $1.45 \pm0.25$  
$\mathit A{}^{(0,{{\mathit \mu}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$   $1.69 \pm0.13$  
$\mathit A{}^{(0,{{\mathit \tau}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$   $1.88 \pm0.17$  
$\mathit A{}^{(0,{{\mathit \ell}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$   $1.71 \pm0.10$  
$\mathit A{}^{(0,{{\mathit u}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit u}}{{\overline{\mathit u}}}$   $4 \pm7$  
$\mathit A{}^{(0,{{\mathit s}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit s}}{{\overline{\mathit s}}}$   $9.8 \pm1.1$  
$\mathit A{}^{(0,{{\mathit c}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit c}}{{\overline{\mathit c}}}$   $7.07 \pm0.35$  
$\mathit A{}^{(0,{{\mathit b}})}_{\mathit FB}$ CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$   $9.92 \pm0.16$  
CHARGE ASYMMETRY IN ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$
CHARGE ASYMMETRY IN ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
ANOMALOUS ${{\boldsymbol Z}}{{\boldsymbol Z}}{{\boldsymbol \gamma}}$ , ${{\boldsymbol Z}}{{\boldsymbol \gamma}}{{\boldsymbol \gamma}}$ , AND ${{\boldsymbol Z}}{{\boldsymbol Z}}{{\boldsymbol V}}$ COUPLINGS
$\mathit h{}^{\mathit V}_{\mathit i}$
$\mathit f{}^{\mathit V}_{\mathit i}$
ANOMALOUS ${{\boldsymbol W}}/{{\boldsymbol Z}}$ QUARTIC COUPLINGS
$\mathit a_{0}/\Lambda {}^{2}$, $\mathit a_{{{\mathit c}}}/\Lambda {}^{2}$
$\Gamma_{1}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ [1]$(3.3632 \pm{0.0042 )\%}$45594
$\Gamma_{2}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ [1]$(3.3662 \pm{0.0066 )\%}$45594
$\Gamma_{3}$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ [1]$(3.3696 \pm{0.0083 )\%}$45559
$\Gamma_{4}$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ [2][1]$(3.3658 \pm{0.0023 )\%}$
$\Gamma_{5}$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ [3]$(3.5\pm{0.4})\times 10^{-6}$S=1.7 45594
$\Gamma_{6}$ invisible [1]$(20.000 \pm{0.055 )\%}$
$\Gamma_{7}$ hadrons [1]$(69.911 \pm{0.056 )\%}$
$\Gamma_{8}$ (${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit u}}}$ + ${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$)/2 $(11.6\pm{0.6})\%$
$\Gamma_{9}$ (${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit d}}}$ + ${\mathit {\mathit s}}$ ${\mathit {\overline{\mathit s}}}$ + ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$)/3 $(15.6\pm{0.4})\%$
$\Gamma_{10}$ ${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ $(12.03\pm{0.21})\%$
$\Gamma_{11}$ ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ $(15.12\pm{0.05})\%$
$\Gamma_{12}$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ $(3.6\pm{1.3})\times 10^{-4}$
$\Gamma_{13}$ ${{\mathit g}}{{\mathit g}}{{\mathit g}}$ $<1.1\%$CL=95%
$\Gamma_{14}$ ${{\mathit \pi}^{0}}{{\mathit \gamma}}$ $<2.01\times 10^{-5}$CL=95%45594
$\Gamma_{15}$ ${{\mathit \eta}}{{\mathit \gamma}}$ $<5.1\times 10^{-5}$CL=95%45592
$\Gamma_{16}$ ${{\mathit \omega}}{{\mathit \gamma}}$ $<6.5\times 10^{-4}$CL=95%45590
$\Gamma_{17}$ ${{\mathit \eta}^{\,'}{(958)}}{{\mathit \gamma}}$ $<4.2\times 10^{-5}$CL=95%45589
$\Gamma_{18}$ ${{\mathit \phi}}{{\mathit \gamma}}$ $<8.3\times 10^{-6}$CL=95%45588
$\Gamma_{19}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $<1.46\times 10^{-5}$CL=95%45594
$\Gamma_{20}$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $<1.52\times 10^{-5}$CL=95%45594
$\Gamma_{21}$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \gamma}}$ $<2.2\times 10^{-6}$CL=95%45594
$\Gamma_{22}$ ${{\mathit \pi}^{\pm}}{{\mathit W}^{\mp}}$ [4]$<7\times 10^{-5}$CL=95%10167
$\Gamma_{23}$ ${{\mathit \rho}^{\pm}}{{\mathit W}^{\mp}}$ [4]$<8.3\times 10^{-5}$CL=95%10142
$\Gamma_{24}$ ${{\mathit J / \psi}{(1S)}}$ X $(3.51^{+0.23}_{-0.25})\times 10^{-3}$S=1.1 
$\Gamma_{25}$ ${{\mathit J / \psi}{(1S)}}{{\mathit \gamma}}$ $<2.6\times 10^{-6}$CL=95%45541
$\Gamma_{26}$ ${{\mathit \psi}{(2S)}}$ X $(1.60\pm{0.29})\times 10^{-3}$
$\Gamma_{27}$ ${{\mathit \chi}_{{c1}}{(1P)}}$ X $(2.9\pm{0.7})\times 10^{-3}$
$\Gamma_{28}$ ${{\mathit \chi}_{{c2}}{(1P)}}$ X $<3.2\times 10^{-3}$CL=90%
$\Gamma_{29}$ ${{\mathit \Upsilon}{(1S)}}$ X +${{\mathit \Upsilon}{(2S)}}$ X +${{\mathit \Upsilon}{(3S)}}$ X $(1.0\pm{0.5})\times 10^{-4}$
$\Gamma_{30}$ ${{\mathit \Upsilon}{(1S)}}$ X $<3.4\times 10^{-6}$CL=95%
$\Gamma_{31}$ ${{\mathit \Upsilon}{(2S)}}$ X $<6.5\times 10^{-6}$CL=95%
$\Gamma_{32}$ ${{\mathit \Upsilon}{(3S)}}$ X $<5.4\times 10^{-6}$CL=95%
$\Gamma_{33}$ ( ${{\mathit D}^{0}}$ /${{\overline{\mathit D}}^{0}}$) X $(20.7\pm{2.0})\%$
$\Gamma_{34}$ ${{\mathit D}^{\pm}}$ X $(12.2\pm{1.7})\%$
$\Gamma_{35}$ ${{\mathit D}^{*}{(2010)}^{\pm}}$ X [4]$(11.4\pm{1.3})\%$
$\Gamma_{36}$ ${{\mathit D}_{{s1}}{(2536)}^{\pm}}$ X $(3.6\pm{0.8})\times 10^{-3}$
$\Gamma_{37}$ ${{\mathit D}_{{sJ}}{(2573)}^{\pm}}$ X $(5.8\pm{2.2})\times 10^{-3}$
$\Gamma_{38}$ ${{\mathit D}^{*'}{(2629)}^{\pm}}$ X searched for
$\Gamma_{39}$ ${{\mathit B}}$ X 
$\Gamma_{40}$ ${{\mathit B}^{*}}$ X 
$\Gamma_{41}$ ${{\mathit B}^{+}}$ X [5]$(6.08\pm{0.13})\%$
$\Gamma_{42}$ ${{\mathit B}_{{s}}^{0}}$ X [5]$(1.59\pm{0.13})\%$
$\Gamma_{43}$ ${{\mathit B}_{{c}}^{+}}$ X searched for
$\Gamma_{44}$ ${{\mathit \Lambda}_{{c}}^{+}}$ X $(1.54\pm{0.33})\%$
$\Gamma_{45}$ ${{\mathit \Xi}_{{c}}^{0}}$ X seen
$\Gamma_{46}$ ${{\mathit \Xi}_{{b}}}$ X seen
$\Gamma_{47}$ ${{\mathit b}}$ -baryon X [5]$(1.38\pm{0.22})\%$
$\Gamma_{48}$ anomalous ${{\mathit \gamma}}$ + hadrons [6]$<3.2\times 10^{-3}$CL=95%
$\Gamma_{49}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ [6]$<5.2\times 10^{-4}$CL=95%45594
$\Gamma_{50}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$ [6]$<5.6\times 10^{-4}$CL=95%45594
$\Gamma_{51}$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}{{\mathit \gamma}}$ [6]$<7.3\times 10^{-4}$CL=95%45559
$\Gamma_{52}$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \gamma}}{{\mathit \gamma}}$ [7]$<6.8\times 10^{-6}$CL=95%
$\Gamma_{53}$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \gamma}}{{\mathit \gamma}}$ [7]$<5.5\times 10^{-6}$CL=95%
$\Gamma_{54}$ ${{\mathit \nu}}{{\overline{\mathit \nu}}}{{\mathit \gamma}}{{\mathit \gamma}}$ [7]$<3.1\times 10^{-6}$CL=95%45594
$\Gamma_{55}$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ [4]$<7.5\times 10^{-7}$CL=95%45594
$\Gamma_{56}$ ${{\mathit e}^{\pm}}{{\mathit \tau}^{\mp}}$ [4]$<9.8\times 10^{-6}$CL=95%45576
$\Gamma_{57}$ ${{\mathit \mu}^{\pm}}{{\mathit \tau}^{\mp}}$ [4]$<1.2\times 10^{-5}$CL=95%45576
$\Gamma_{58}$ ${{\mathit p}}{{\mathit e}}$ $<1.8\times 10^{-6}$CL=95%45589
$\Gamma_{59}$ ${{\mathit p}}{{\mathit \mu}}$ $<1.8\times 10^{-6}$CL=95%45589