Backwards evolved initial state parton showers

Gottschalk, Thomas D.

doi:10.1016/0550-3213(86)90465-7

Cited by 42 publications

(30 citation statements)

References 33 publications

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“…In first-order QED [Ber85] and in some simple QCD toy models [Got86], one may show that the 'correct' choice is the 'ŝ approach'. Here one requires thatŝ = x 1 x 2 s, both at the hard scattering scale and at any lower scale, i.e.ŝ(Q 2 ) = x 1 (Q 2 ) x 2 (Q 2 ) s, where x 1 and x 2 are the x values of the two resolved partons (one from each incoming beam particle) at the given Q 2 scale.…”

Section: Transverse Evolutionmentioning

confidence: 99%

PYTHIA 6.4 physics and manual

Sjöstrand

Mrenna

Skands

2006

J. High Energy Phys.

9,632

10,151

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The Pythia program can be used to generate high-energy-physics 'events', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide range of reactions, with emphasis on those where strong interactions play a rôle, directly or indirectly, and therefore multihadronic final states are produced. The physics is then not understood well enough to give an exact description; instead the program has to be based on a combination of analytical results and various QCDbased models. This physics input is summarized here, for areas such as hard subprocesses, initial-and final-state parton showers, beam remnants and underlying events, fragmentation and decays, and much more. Furthermore, extensive information is provided on all program elements: subroutines and functions, switches and parameters, and particle and process data. This should allow the user to tailor the generation task to the topics of interest.

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Section: Transverse Evolutionmentioning

confidence: 99%

PYTHIA 6.4 physics and manual

Sjöstrand

Mrenna

Skands

2006

J. High Energy Phys.

9,632

10,151

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“…In each case, the development works from relatively hard interactions to softer interactions. In the case of the initial state, this means going backwards in physical time [20,21].…”

Section: Jhep06(2014)179mentioning

confidence: 99%

Parton distribution functions in the context of parton showers

Nagy

Soper

2014

J. High Energ. Phys.

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When the initial state evolution of a parton shower is organized according to the standard "backward evolution" prescription, ratios of parton distribution functions appear in the splitting probabilities. The shower thus organized evolves from a hard scale to a soft cutoff scale. At the end of the shower, one expects that only the parton distributions at the soft scale should affect the results. The other effects of the parton distributions should have cancelled. This means that the kernels for parton evolution should be related to the shower splitting functions. If the initial state partons can have non-zero masses, this requires that the evolution kernels cannot be the usual MS kernels. We work out what the parton evolution kernels should be to match the shower evolution contained in the parton shower event generator Deductor, in which the b and c quarks have non-zero masses.

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“…(2.7) allows us to generate radiations from the incoming quark by evolving the proton from the scale t X . This is known as backward evolution [31,32,30].…”

Section: Formalismmentioning

confidence: 99%

A simple merging algorithm for jet angular correlation studies

Nakamura

2016

J. High Energ. Phys.

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A tree level merging algorithm which guarantees the leading order (LO) accuracy of angular correlations among jets is proposed and studied. The algorithm is designed so that n-jet events are generated exclusively according to the LO n-parton production cross section and each of the n jets is close to each of the n partons in terms of the jet measure. As a result, the kinematics of each of the n jets strictly follows that of each of the n partons and the LO accuracy of angular correlations among the n jets is preserved. The validity of the method as a merging algorithm is confirmed by comparing it against existing merging algorithms for several observables in the top quark pair production. Correlations in the azimuthal angle difference between the two highest transverse momentum jets with large rapidity separations are evaluated as examples.

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Backwards evolved initial state parton showers

Cited by 42 publications

References 33 publications

PYTHIA 6.4 physics and manual

PYTHIA 6.4 physics and manual

Parton distribution functions in the context of parton showers

A simple merging algorithm for jet angular correlation studies

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