Study of Xb meson production in pp collisions at √s=7 and 8 TeV and observation of the decay Xb (3P) → ϒ (3S) γ

作者：Aaij R.; Adeva B.; Adinolfi M.; Affolder A.; Ajaltouni Z.; Akar S.; Albrecht J.; Alessio F.; Alexander M.; Ali S.; Alkhazov G.; Alvarez Cartelle P.; Alves A.A.; Amato S.; Amerio S.; Amhis Y.; An L.; Anderlini L.; Anderson J.; Andreassen R.; Andreotti M.; Andrews J.E.; Appleby R.B.; Aquines Gutierrez O.; Archilli F.; Artamonov A.; Artuso M.; Aslanides E.; Auriemma G.; Baalouch M.; Bachmann S.; Back J.J.; Badalov A.; Baldini W.; Barlow R.J.; Barschel C.; Barsuk S.; Barter W.; Batozskaya V.

来源：European Physical Journal C, 2014, 74(10): 1-13.

A study of meson production at LHCb is performed on proton–proton collision data, corresponding to 3.0 of integrated luminosity collected at centre-of-mass energies = 7 and 8. The fraction of Υ mesons originating from χ decays is measured as a function of the transverse momentum in the rapidity range. The radiative transition of the meson to Υ is observed for the first time. The χ mass is determined to be (Formula presented.) where the first uncertainty is statistical and the second is systematic.