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Measurement of observables sensitive to coherence effects in hadronic Z decays with the OPAL detector at LEP

The collaboration
Eur.Phys.J. C75 (2015) 571, 2015

Abstract (data abstract)
CERN-LEP. A study of QCD coherence is presented based on a sample of about 397000 $e^+e^-$ hadronic annihilation events collected at $\sqrt{s}=91$ GeV with the OPAL detector at LEP. The study is based on four recently proposed observables that are sensitive to coherence effects in the perturbative regime. The measurement of these observables is presented, along with a comparison with the predictions of different parton shower models. The models include both conventional parton shower models and dipole antenna models. Different ordering variables are used to investigate their influence on the predictions.

• #### Table 1

Data from Table 2

10.17182/hepdata.73695.v1/t1

The normalized corrected data at the hadron level for the emission angle $\theta_{14}$.

• #### Table 2

Data from Table 2

10.17182/hepdata.73695.v1/t2

The correlation matrix of the normalized corrected data at the hadron level for the emission angle $\theta_{14}$.

• #### Table 3

Data from Table 3

10.17182/hepdata.73695.v1/t3

The normalized corrected data at the hadron level for the mass ratio $\rho=M_L^2/M_H^2$.

• #### Table 4

Data from Table 3

10.17182/hepdata.73695.v1/t4

The correlation matrix of the normalized corrected data at the hadron level for the mass ratio $\rho=M_L^2/M_H^2$.

• #### Table 5

Data from Table 3

10.17182/hepdata.73695.v1/t5

The normalized corrected data at the hadron level for the difference in emission angles $\theta^*$.

• #### Table 6

Data from Table 3

10.17182/hepdata.73695.v1/t6

The correlation matrix of the normalized corrected data at the hadron level for the difference in emission angles $\theta^*$.

• #### Table 7

Data from Table 3

10.17182/hepdata.73695.v1/t7

The normalized corrected data at the hadron level for the 2-point double ratio $C_2^{(1/5)}$.

• #### Table 8

Data from Table 3

10.17182/hepdata.73695.v1/t8

The correlation matrix of the normalized corrected data at the hadron level for the 2-point double ratio $C_2^{(1/5)}$.

• #### Table 9

Data from Table 4

10.17182/hepdata.73695.v1/t9

The corrected data for the derived distributions. The table lists the results for $\theta_{14}$ asymmetry ratios defined in Eq. (3),...

• #### Table 10

Data from Table 4

10.17182/hepdata.73695.v1/t10

The corrected data for the derived distributions. The table lists the results for $\theta_{14}$ asymmetry ratios defined in Eq. (3),...

• #### Table 11

Data from Table 4

10.17182/hepdata.73695.v1/t11

The corrected data for the derived distributions. The table lists the results for $\theta_{14}$ asymmetry ratios defined in Eq. (3),...

• #### Table 12

Data from Table 4

10.17182/hepdata.73695.v1/t12

The corrected data for the derived distributions. The results for the asymmetries defined for the other observables.

• #### Table 13

Data from Table 4

10.17182/hepdata.73695.v1/t13

The corrected data for the derived distributions. The results for the asymmetries defined for the other observables.

• #### Table 14

Data from Table 4

10.17182/hepdata.73695.v1/t14

The corrected data for the derived distributions. The results for the asymmetries defined for the other observables.