An updated study of Y production and polarizationat the Tevatron and LHC

FENG Yu; GONG Bin; WAN Lu-Ping; WANG Jian-Xiong

doi:10.1088/1674-1137/39/12/123102

Chinese Physics C> 2015, Vol. 39> Issue(12) : 123102 DOI: 10.1088/1674-1137/39/12/123102

An updated study of Y production and polarizationat the Tevatron and LHC

1.
Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918(4), Beijing 100049, China

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Abstract：
Following the nonrelativistic QCD factorization scheme, by taking the latest available measurements of χ_bJ(3P) into consideration, we present an updated study on the yield and polarization of Y(1S, 2S, 3S) hadroproduction, and the fractions of χ_bJ(mP) feed-down in Y(nS) production at QCD next-to-leading order. In the fitting, three schemes are applied with different choices of χ_bJ(mP) feed-down ratios and NRQCD factorization scale. The results can explain the measurements of yield very well. The polarization puzzle to (3S) is now solved by considering the χ_bJ(3P) feed-down contributions. The ratio of σ[χ_b2(1P)]/σ[χ_b1(1P)] measured by the CMS experiment can also be reproduced in our prediction. Among the different schemes, the results show little difference, but there are sizeable differences for the fitted long-distance color-octet matrix elements. This may bring large uncertainties when the values are applied in theoretical predictions for other experiments such as those at ee, ep colliders.
- non-relativistic quantum chromodynamics ,
- next-to-leading order ,
- Y ,
- bJ feed-down contributions ,
- polarization

References

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FENG Yu, GONG Bin, WAN Lu-Ping and WANG Jian-Xiong. An updated study of Y production and polarizationat the Tevatron and LHC[J]. Chinese Physics C, 2015, 39(12): 123102. doi: 10.1088/1674-1137/39/12/123102

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Received: 2015-03-31
Revised: 2015-07-08

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Supported by National Nature Science Foundation of China (11475183) and Youth Innovation Promotion Association of CAS (2014010)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

An updated study of Y production and polarizationat the Tevatron and LHC

Corresponding author: FENG Yu,

Corresponding author: GONG Bin,

Corresponding author: WAN Lu-Ping,

Corresponding author: WANG Jian-Xiong,

1. Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918(4), Beijing 100049, China

Received Date: 2015-03-31

Accepted Date: 2015-07-08

Available Online: 2015-12-20

Fund Project: Supported by National Nature Science Foundation of China (11475183) and Youth Innovation Promotion Association of CAS (2014010)

Abstract: Following the nonrelativistic QCD factorization scheme, by taking the latest available measurements of χ_bJ(3P) into consideration, we present an updated study on the yield and polarization of Y(1S, 2S, 3S) hadroproduction, and the fractions of χ_bJ(mP) feed-down in Y(nS) production at QCD next-to-leading order. In the fitting, three schemes are applied with different choices of χ_bJ(mP) feed-down ratios and NRQCD factorization scale. The results can explain the measurements of yield very well. The polarization puzzle to (3S) is now solved by considering the χ_bJ(3P) feed-down contributions. The ratio of σ[χ_b2(1P)]/σ[χ_b1(1P)] measured by the CMS experiment can also be reproduced in our prediction. Among the different schemes, the results show little difference, but there are sizeable differences for the fitted long-distance color-octet matrix elements. This may bring large uncertainties when the values are applied in theoretical predictions for other experiments such as those at ee, ep colliders.

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An updated study of Y production and polarizationat the Tevatron and LHC

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