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Probing transverse-momentum dependent evolution with groomed jets
A bstract We propose an observable which involves measuring the properties (transverse momentum p h ⊥ and energy fraction z h ) of an identified hadron inside a groomed jet. The jet is identified with an anti-kT/CA algorithm and is groomed by implementing the modified mass drop procedure with an ene...
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Published in: | The journal of high energy physics 2018-07, Vol.2018 (7), p.1-23, Article 167 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | A
bstract
We propose an observable which involves measuring the properties (transverse momentum
p
h
⊥
and energy fraction
z
h
) of an identified hadron inside a groomed jet. The jet is identified with an anti-kT/CA algorithm and is groomed by implementing the modified mass drop procedure with an energy cut-off parameter,
z
cut
. The transverse momentum of the hadron inside the jet is measured with respect to the groomed jet axis. We obtain a factorization theorem in the framework of Soft Collinear Effective Theory (SCET), to define a Transverse Momentum Dependent Fragmenting Jet Function (TMDFJF). The TMDFJF is factorized into collinear and collinear soft modes by matching onto SCET
+
. We resum large logarithms in
E
J
/p
h
⊥
, where
E
J
is the ungroomed jet energy, to NLL accuracy and apply this formalism for computing the shape of the
p
h
⊥
distribution of a pion produced in an
e
+
+
e
−
collision. We observe that the introduction of grooming makes this observable insensitive to non-global logarithms and particularly sensitive to non-perturbative physics of the transverse momentum dependent evolution at low values of
p
h
⊥
, which can be probed in the variation of the cut-off parameter,
z
cut
, of the groomer. We discuss how this observable can be used to distinguish between non-perturbative models that describe universal TMD evolution and provide a window into the three dimensional structure of hadrons. |
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ISSN: | 1029-8479 1029-8479 |
DOI: | 10.1007/JHEP07(2018)167 |