10 papers found.

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Double parton scattering in proton-proton collisions includes kinematic regions in which two partons inside a proton originate from the perturbative splitting of a single parton. This leads to a double counting problem between single and double hard scattering. We present a solution to this problem, which allows for the definition of double parton distributions as operator matrix...

Jet vetoes play an important role in many analyses at the LHC. Traditionally, jet vetoes have been imposed using a restriction on the transverse momentum p Tj of jets. Alternatively, one can also consider jet observables for which p Tj is weighted by a smooth function of the jet rapidity y j that vanishes as |y j | → ∞. Such observables are useful as they provide a natural way to...

**Jonathan** **R**. **Gaunt**
Theory Group
Deutsches Elektronen-Synchrotron (DESY)
D-
Hamburg
Germany
We show that for hadronic transverse energy ET in hadron-hadron collisions, the classic Collins-Soper

We present the first calculation of a fully-unintegrated parton distribution (beam function) at next-to-next-to-leading order (NNLO). We obtain the fully-differential beam function for quark-initiated processes by matching it onto standard parton distribution functions (PDFs) at two loops. The fully-differential beam function is a universal ingredient in resummed predictions of...

For any factorisation proof, a crucial step is a demonstration of the cancellation of so-called Glauber gluons. We summarise a recent paper in which we demonstrated this cancellation for double Drell–Yan production (the double parton scattering process in which a pair of electroweak gauge bosons is produced), both for the integrated cross section and for the cross section...

An essential part of any factorisation proof is the demonstration that the exchange of Glauber gluons cancels for the considered observable. We show this cancellation at all orders for double Drell-Yan production (the double parton scattering process in which a pair of electroweak gauge bosons is produced) both for the integrated cross section and for the cross section...

**Jonathan** **R**. **Gaunt**
0
0
Cavendish Laboratory, University of Cambridge
, J.J. Thomson Avenue, Cambridge CB3 0HE, U.K. Deutsches Elektronen-Synchroton DESY, 22603 Hamburg,
Germany
Open Access
1

We present a subtraction method utilizing the N -jettiness observable, T N , to perform QCD calculations for arbitrary processes at next-to-next-to-leading order (NNLO). Our method employs soft-collinear effective theory (SCET) to determine the IR singular contributions of N -jet cross sections for T N → 0, and uses these to construct suitable T N -subtractions. The construction...

**Jonathan** **R**. **Gaunt**
Maximilian Stahlhofen
Frank J. Tackmann
Theory Group
Deutsches Elektronen-Synchrotron (DESY)
Notkestrae
D-
Hamburg
Germany E-mail:
The virtuality-dependent beam function is a

**Jonathan** **R**. **Gaunt**
Maximilian Stahlhofen
Frank J. Tackmann
In differential measurements at a hadron collider, collinear initial-state radiation is described by process-independent beam functions