Excitations of the worldsheet axion in an effective QCD string theory produce a phase-dependent effective tension that exponentially modifies the rate of string breaking via quark pair nucleation.
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Implementation of two NLL-accurate dipole showers in Herwig shows that differences in infrared cutoffs produce noticeable effects at the hadron level and affect model tunability.
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A more effective QCD string at colliders: Decay of excited strings and the worldsheet axion
Excitations of the worldsheet axion in an effective QCD string theory produce a phase-dependent effective tension that exponentially modifies the rate of string breaking via quark pair nucleation.
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Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig
Implementation of two NLL-accurate dipole showers in Herwig shows that differences in infrared cutoffs produce noticeable effects at the hadron level and affect model tunability.