Evidence for gluon bremsstrahlung in e+e− annihilations at high energies

Berger, Ch.; Genzel, H.; Grigull, R.; Lackas, W.; Raupach, F.; Klovning, A.; Lillestøl, Egil; Lillethun, E.; Skard, J. A.; Ackermann, H.; Alexander, G.; Barreiro, F.; Burger, J. D.; Criegee, L.; Dehne, H. C.; Devenish, R.C.E.; Eskreys, A.; Flügge, G.; Franke, G.; Gabriel, W.; Gerke, Ch.; Knies, G.; Lehmann, E.; Mertiens, H.D.; Pape, K. H.; Reich, H.; Stella, B.; Swamy, T. N. Ranga; Timm, U.; Wagner, W.; Waloschek, P.; Winter, G. G.; Zimmermann, W.; Achterberg, O.; Blobel, V.; Boesten, L.; Kapitza, H.; Koppitz, B.; Lührsen, W.; Maschuw, R.; Staa, R. van; Spitzer, H.; Chang, C. Y.; Glasser, R. G.; Kellogg, R. G.; Lau, K.; Sechi-Zorn, B.; Skuja, A.; Welch, G. E.; Zorn, G. T.; Bäcker, A.; Brandt, Siegmund; Derikum, K.; Diekmann, A.; Grupen, C.; Meyer, H.; Neumann, B.; Rost, M.; Zech, G.; Azemoon, T.; Daum, H. J.; Meyer, H.; Meyer, Olivier; Rößler, M.; Schmidt, D.; Wacker, K.

doi:10.1016/0370-2693(79)90869-4

Cited by 209 publications

(26 citation statements)

References 16 publications

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“…They are ubiquitous in particle collider experiments and indespensible to study the underlying dynamics and interactions. Jets have played a central role in the discovery and property measurements of many fundamental particles like the gluon (g) [1][2][3][4] and the top quark (t) [5,6]. They have provided key insights into the structure of the strong force and were indispensable in the study of Higgs boson (H) couplings to heavy third generation quarks [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Jet substructure at the Large Hadron Collider

Kogler¹,

Nachman²,

Schmidt³

et al. 2019

Rev. Mod. Phys.

205

141

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Section: Introductionmentioning

confidence: 99%

Jet substructure at the Large Hadron Collider

Kogler¹,

Nachman²,

Schmidt³

et al. 2019

Rev. Mod. Phys.

205

141

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show abstract

“…However, direct measurement of a particle's charge under quantum chromodynamics (QCD) or color is subtle, as all of the particles that are actually detected by experiment are color-neutral. A particle's color, or at least if it has non-zero color, is inferred from jet production and quantities measured on jets [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Calculating pull for non-singlet jets

Bao

Larkoski

2019

J. High Energ. Phys.

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The pull vector is a jet observable sensitive to the distribution of soft radiation controlled by the color flow in a collider event. We present calculations to leading order in the soft and collinear limits for the pull vector measured between pairs of jets that do not form a color-singlet dipole. Our calculations are presented within the context of e + e − → three jets events, on which pull is measured between the two subleading jets. A subset of these calculations can be re-interpreted as a bottom-anti-bottom quark jet pair in a color octet configuration, which can be a background to Higgs production at large boost. We also present a universal expression for the pull distribution in the high-boost and small jet radius limit. This distribution is controlled by color SU(3) quadratic Casimirs that arise from product representations of pairs of QCD jets.

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“…Jet algorithms are a powerful way to categorize and organize collision events [5,6], but event shapes (and jet shapes) offer a more sensitive probe of jet formation itself [7]. Indeed, though the observation of three-jet structure in e + e − collisions strongly hinted at the existence of gluons [8,9], an unambiguous discovery at PETRA [10][11][12][13] required the use of event shapes like thrust [14] and oblateness [11].…”

Section: Introductionmentioning

confidence: 99%

The first calculation of fractional jets

Bertolini

Thaler

Walsh

2015

J. High Energ. Phys.

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In collider physics, jet algorithms are a ubiquitous tool for clustering particles into discrete jet objects. Event shapes offer an alternative way to characterize jets, and one can define a jet multiplicity event shape, which can take on fractional values, using the framework of "jets without jets". In this paper, we perform the first analytic studies of fractional jet multiplicity N jet in the context of e + e − collisions. We use fixed-order QCD to understand the N jet cross section at order α 2 s , and we introduce a candidate factorization theorem to capture certain higher-order effects. The resulting distributions have a hybrid jet algorithm/event shape behavior which agrees with parton shower Monte Carlo generators. The N jet observable does not satisfy ordinary soft-collinear factorization, and the N jet cross section exhibits a number of unique features, including the absence of collinear logarithms and the presence of soft logarithms that are purely non-global. Additionally, we find novel divergences connected to the energy sharing between emissions, which are reminiscent of rapidity divergences encountered in other applications. Given these interesting properties of fractional jet multiplicity, we advocate for future measurements and calculations of N jet at hadron colliders like the LHC.

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Evidence for gluon bremsstrahlung in e+e− annihilations at high energies

Cited by 209 publications

References 16 publications

Jet substructure at the Large Hadron Collider

Jet substructure at the Large Hadron Collider

Calculating pull for non-singlet jets

The first calculation of fractional jets

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