Study of $$\upchi _{{\mathrm {b}}}$$ χ b meson production in $$\mathrm {p} $$ p $$\mathrm {p} $$ p collisions at $$\sqrt{s}=7$$ s = 7 and $$8{\mathrm {\,TeV}} $$ 8 TeV and observation of the decay $$\upchi _{{\mathrm {b}}}\mathrm {(3P)} \rightarrow \Upsilon \mathrm {(3S)} {\upgamma } $$ χ b ( 3 P ) → Υ ( 3 S ) γ
European physical journal. C, Particles and fields