O(αs) corrections to longitudinal spin-spin correlations in e+e- → qq̄

S. Groote; J. G. Körner; J. A. Leyva

doi:10.1016/S0370-2693(97)01240-9

O(α_s) corrections to longitudinal spin-spin correlations in e⁺e^- → qq̄

S. Groote
, J. G. Körner
, J. A. Leyva

Johannes Gutenberg University Mainz
CIF

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

We calculate the O(α_s) corrections to longitudinal spin-spin correlations in e⁺e^- → qq̄. For top quark pair production the O(α_s) corrections to the longitudinal spin-spin asymmetry amount to less than 1% in the q²-range from above tt-threshold up to √q² = 1000GeV. In the e⁺e^- → bb̄ case the O(α_s) corrections reduce the asymmetry value from its m = 0 value of -1 to approximately -0.96 for q²-values around the Z-peak. This reduction can be traced to finite anomalous contributions from residual mass effects which survive the m → 0 limit. We discuss the role of the anomalous contributions and the pattern of how they contribute to spin-flip and no-flip terms.

Original language	English
Pages (from-to)	192-198
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	418
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(97)01240-9
State	Published - 29 Jan 1998
Externally published	Yes

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@article{bce2351aaa2c4522a04208bed8d8b18a,

title = "O(αs) corrections to longitudinal spin-spin correlations in e+e- → q{\=q}",

abstract = "We calculate the O(αs) corrections to longitudinal spin-spin correlations in e+e- → q{\=q}. For top quark pair production the O(αs) corrections to the longitudinal spin-spin asymmetry amount to less than 1\% in the q2-range from above tt-threshold up to √q2 = 1000GeV. In the e+e- → b{\=b} case the O(αs) corrections reduce the asymmetry value from its m = 0 value of -1 to approximately -0.96 for q2-values around the Z-peak. This reduction can be traced to finite anomalous contributions from residual mass effects which survive the m → 0 limit. We discuss the role of the anomalous contributions and the pattern of how they contribute to spin-flip and no-flip terms.",

author = "S. Groote and K{\"o}rner, \{J. G.\} and Leyva, \{J. A.\}",

note = "Funding Information: This work is partially supported by the BMBF, FRG, under contract No. 06MZ865, and by HUCAM, EU, under contract No. CHRX-CT94-0579. S.G. acknowledges financial support by the DFG, FRG. The work of J.A.L. is supported by the DAAD, FRG.",

year = "1998",

month = jan,

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doi = "10.1016/S0370-2693(97)01240-9",

language = "English",

volume = "418",

pages = "192--198",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - O(αs) corrections to longitudinal spin-spin correlations in e+e- → qq̄

AU - Groote, S.

AU - Körner, J. G.

AU - Leyva, J. A.

N1 - Funding Information: This work is partially supported by the BMBF, FRG, under contract No. 06MZ865, and by HUCAM, EU, under contract No. CHRX-CT94-0579. S.G. acknowledges financial support by the DFG, FRG. The work of J.A.L. is supported by the DAAD, FRG.

PY - 1998/1/29

Y1 - 1998/1/29

N2 - We calculate the O(αs) corrections to longitudinal spin-spin correlations in e+e- → qq̄. For top quark pair production the O(αs) corrections to the longitudinal spin-spin asymmetry amount to less than 1% in the q2-range from above tt-threshold up to √q2 = 1000GeV. In the e+e- → bb̄ case the O(αs) corrections reduce the asymmetry value from its m = 0 value of -1 to approximately -0.96 for q2-values around the Z-peak. This reduction can be traced to finite anomalous contributions from residual mass effects which survive the m → 0 limit. We discuss the role of the anomalous contributions and the pattern of how they contribute to spin-flip and no-flip terms.

AB - We calculate the O(αs) corrections to longitudinal spin-spin correlations in e+e- → qq̄. For top quark pair production the O(αs) corrections to the longitudinal spin-spin asymmetry amount to less than 1% in the q2-range from above tt-threshold up to √q2 = 1000GeV. In the e+e- → bb̄ case the O(αs) corrections reduce the asymmetry value from its m = 0 value of -1 to approximately -0.96 for q2-values around the Z-peak. This reduction can be traced to finite anomalous contributions from residual mass effects which survive the m → 0 limit. We discuss the role of the anomalous contributions and the pattern of how they contribute to spin-flip and no-flip terms.

UR - https://www.scopus.com/pages/publications/0345829542

U2 - 10.1016/S0370-2693(97)01240-9

DO - 10.1016/S0370-2693(97)01240-9

M3 - Article

AN - SCOPUS:0345829542

SN - 0370-2693

VL - 418

SP - 192

EP - 198

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

O(α_s) corrections to longitudinal spin-spin correlations in e⁺e^- → qq̄

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