Measurement of the fraction of \Y1S originating from χb1P decays in $pp$ collisions at $\sqrts = 7\tev$
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Abstract
The production of χb1P mesons in $pp$ collisions at a centre-of-mass energy of $7\tev$ is studied using $32∈vpb$ of data collected with the \lhcb detector. The $χb1P$ mesons are reconstructed in the decay mode $χb1P \to \Y1S\g \to μmu\g$. The fraction of \Y1S originating from χb1P decays in the \Y1S transverse momentum range $6 < \pt^\Y1S < 15≥vc$ and rapidity range $2.0 < y^\Y1S < 4.5$ is measured to be $(20.7± 5.7± 2.1^+2.7_-5.4)%$, where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown \Y1S and χb1P polarizations.





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