The paper introduces azimuthal-dependent jet broadening and jet shape observables, calculates their jet functions in SCET for standard and Winner-Take-All axes, and shows the broadening can directly probe the collinear transversity PDF in DIS.
On the QCD analysis of Jet Broadening
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abstract
The perturbative all-order analysis of the jet-broadening B-distribution in the small-B region is carried out with single-logarithmic accuracy, which requires the control of both the sum of the moduli and the modulus of the sum of the transverse momenta of soft gluons. We confirm the master equation for the B-distribution derived by Catani, Turnock and Webber (CTW). Proper treatment of quark recoil is necessary at this accuracy. This effect was neglected in the CTW solution. We show that the answer can be expressed in terms of the CTW result but evaluated at a properly rescaled B value.
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Anisotropic jet broadening and jet shape
The paper introduces azimuthal-dependent jet broadening and jet shape observables, calculates their jet functions in SCET for standard and Winner-Take-All axes, and shows the broadening can directly probe the collinear transversity PDF in DIS.