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An updated study of $\Upsilon$ production and polarization at the Tevatron and LHC


Following the nonrelativistic QCD factorization scheme, by taking latest available measurement on?χb(3P)?into consideration, we present an updated study on the yield and polarization of?Υ(1S,2S,3S)?hadroproduction, and the fractions of?χb(mP)?feed-down in?Υ(nS)?production at QCD next-to-leading order. In the fitting, three schemes are applied with different choice of?χb(mP)?feed-down ratios and NRQCD factorization scale. The results can explain the measurements on yield very well as in our previous work. The polarization puzzle to?Υ(3S)?is now solved by considering the?χb(3P)?feed-down contributions. The ratio of?σ[χb2(1P)]/σ[χb1(1P)]?measurements from CMS can also be reproduced in our prediction. Among the different schemes, the results show little difference, but there are sizeable difference for the fitted long-distance color-octet matrix elements. It may bring large uncertainty when the values are applied in other experiments such as in?ee,?ep?colliders.
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Keywords: polarization; LHC;
Recommended references: Yu Feng,Bin Gong,Lu-Ping Wan,Jian-Xiong Wang.(2016).An updated study of $\Upsilon$ production and polarization at the Tevatron and LHC.[ChinaXiv:201609.00899] (Click&Copy)
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[V1] 2016-09-13 08:48:07 chinaXiv:201609.00899V1 Download
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