pdgLive Home   >   ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{{b1}}}{(1P)}}$   >   ${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY

${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY

INSPIRE   JSON  (beta) PDGID:

M077DM

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 129.63 \pm0.33}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below. $129.58$ $\pm0.09$ $\pm0.29$ ARTUSO 00   CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $128.8$ $\pm0.4$ $\pm0.6$ EDWARDS 99   CLE2 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}{(1P)}}$ $131.7$ $\pm0.9$ $\pm1.3$ WALK 98   CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ $131.7$ $\pm0.3$ $\pm1.1$ ALBRECHT 98 E   ARG ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $130.6$ $\pm0.8$ $\pm2.4$ NERNST 98   CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $129$ $\pm0.8$ $\pm1$ HAAS 98   CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $128.1$ $\pm0.4$ $\pm3.0$ KLOPFENSTEIN 98   CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $130.6$ $\pm3.0$ PAUSS 98   CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$

${{\mathit \chi}_{{{b1}}}{(1P)}}$ mass (MeV)

References