Jets in high-energy interactions

Barlow, R. J.

doi:10.1088/0034-4885/56/9/001

Cited by 13 publications

(32 citation statements)

References 266 publications

(39 reference statements)

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“…-Replacing conventional observables with their C-analogs (for this one has to learn to translate physics into the language of C-algebra, which should not be too difficult with the examples given in Secs. [10][11][12][13]. -Exploiting the fully explicit and essentially simple analytical form of Cobservables to develop more flexible and precise computational schemes than what is possible with the conventional rather rigid algorithms.…”

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confidence: 99%

“…Small mass detector (R → 0) 10.10 Large mass detector (R → 1) 10.12 Flow of spectral weight 10.14 Uniform distribution of energy over the sphere 10.15 Spectral density is localized within 0 ≤ s ≤ s max R ≤ Stot 10.17 Zero-mass δ-spike for 0 < R < 1 10.18 Jets and δ-spikes 10.21…”

Section: Table Of Contentsmentioning

confidence: 99%

“…Events with a single jet 10.22 Events with several well-separated jets 10.25 δ-spikes corresponding to groups of jets 10.27 Spurious δ-spikes 10.28 Summary. Evolution of a δ-spike 10.29…”

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confidence: 99%

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Measuring Multijet Structure of Hadronic Energy Flow or, What is a jet?

Tkachov

1997

Int. J. Mod. Phys. A

112

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Ambiguities of jet algorithms are reinterpreted as instability wrt small variations of input. Optimal stability occurs for observables possessing property of calorimetric continuity (C-continuity) predetermined by kinematical structure of calorimetric detectors. The so-called C-correlators form a basic class of such observables and fit naturally into QFT framework, allowing systematic theoretical studies. A few rules generate other C-continuous observables. The resulting C-algebra correctly quantifies any feature of multijet structure such as the "number of jets" and mass spectra of "multijet substates." The new observables are physically equivalent to traditional ones but can be computed from final states bypassing jet algorithms which reemerge as a tool of approximate computation of C-observables from data with all ambiguities under analytical control and an optimal recombination criterion minimizing approximation errors. * Permanent address. 5411 Int. J. Mod. Phys. A 1997.12:5411-5529. Downloaded from www.worldscientific.com by YALE UNIVERSITY on 05/16/15. For personal use only. Regularization 15.29Appendix. General theory of abstract measures 16References 17 b This fact is likely to ignite an ideological discussion. As a preemptive measure, I've made an attempt to clarify certain implicit assumptions behind the conventional point of view on jet counting. This resulted in "philosophical" arguments that are somewhat lengthy and which a pragmatist may not approve of. The subject of hadronic jets, however, is fraught with prejudice (as I discovered in many conversations with both theorists and experimentalists), and it is hard to discuss unarticulated attitudes in brief. I may add that all "philosophical" arguments of this paper are more or less direct answers to the questions raised and attitudes exhibited, by many physicists with whom I discussed these matters. Int. J. Mod. Phys. A 1997.12:5411-5529. Downloaded from www.worldscientific.com by YALE UNIVERSITY on 05/16/15. For personal use only. c For instance, one may need to find -very much by trial and error -an observable with respect to which to perform cuts so as to suppress background. 12,13 d Cf. Ref. 2 as well as the fact that the first modern recombination algorithm was invented in the context of Monte Carlo event generators. 14 e Which are, no doubt, lowly subjects that have nothing to do with The Profound Physics. f The quotations are from the report of Referee A on the first version of Ref. 15. Int. J. Mod. Phys. A 1997.12:5411-5529. Downloaded from www.worldscientific.com by YALE UNIVERSITY on 05/16/15. For personal use only.

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Measuring Multijet Structure of Hadronic Energy Flow or, What is a jet?

Tkachov

1997

Int. J. Mod. Phys. A

112

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“…It makes sense to divide the problems where jets are studied into two classes. The descriptive theory of hadronic jets studies the dynamics of jets as such 4 ; one is mostly interested in qualitative effects that occur in the leading logarithmic order; a systematic improvement of theoretical predictions is, typically, hardly possible. 5 The second class (precision measurements) comprises quantitative studies of the Standard Model (determination of…”

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confidence: 99%

“…(see Ref. 4 for a complete list). 20 Algebraic combinations of C-observables are again Cobservables.…”

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Measuring the number of hadronic jets

Tkachov¹

1995

Phys. Rev. Lett.

186

353

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A quantitative description of the qualitative feature of multihadron final states known as the "number of jets" is given by a sequence of infrared finite shape observables (jet discriminators) that: take continuous values between 0 and 1; are stable-unlike clustering algorithms-against small variations of the input (data errors, Sudakov effects etc.); have a form of multiparticle correlators that is natural in the context of quantum field theory and hence are better suited for a systematic study of theoretical uncertainties (logarithmic and power corrections).

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Jets and quantum field theory

1996

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We discuss quantum-field-theoretic interpretation of the family of observables (the so-called C-algebra) introduced in [12] for a systematic description of multijet structure of multiparticle final states at high energies. We argue that from the point of view of general quantum field theory, all information about the multijet structure is contained in the values of a family of multiparticle quantum correlators that can be expressed in terms of the energy-momentum tensor.

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Jets in high-energy interactions

Cited by 13 publications

References 266 publications

Measuring Multijet Structure of Hadronic Energy Flow or, What is a jet?

Measuring Multijet Structure of Hadronic Energy Flow or, What is a jet?

Measuring the number of hadronic jets

Jets and quantum field theory

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