A simultaneous measurement of the QCD colour factors and the strong coupling

Abbiendi, G.; Ainsley, C.; Åkesson, P. F.; Alexander, G.; Allison, J.; Anagnostou, G.; Anderson, K. J.; Arcelli, S.; Asai, S.; Axen, D.; Azuelos, G.; Bailey, I.; Ball, H.; Barberio, E.; Barlow, R. J.; Batley, R. J.; Behnke, T.; Bell, K. W.; Bella, G.; Bellerive, A.; Benelli, G.; Bethke, S.; Biebel, O.; Bloodworth, I. J.; Boeriu, Oana Vickey; Bock, P.; Böhme, J.; Bonacorsi, D.; Boutemeur, M.; Braibant, S.; Brigliadori, L.; Brown, R. M.; Burckhart, H.; Cammin, J.; Capiluppi, P.; Carnegie, R. K.; Caron, B.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, D. G.; Clarke, P. E.L.; Clay, E.; Cohen, I.; Couchman, J.; Csilling, Á.; Cuffiani, M.; Dado, S.; Dallavalle, G. M.; Dallison, S.; Roeck, A. De; Wolf, E. A. De; Dervan, P.; Desch, K.; Dienes, B.; Dixit, M. S.; Donkers, M.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Estabrooks, P. G.; Etzion, E.; Fabbri, F.; Fanti, M.; Felď, L.; Ferrari, P.; Fiedler, F.; Fleck, I.; Ford, M.; Frey, A.; Fürtjes, A.; Futyan, D. I.; Gagnon, P.; Gary, J. W.; Gaycken, G.; Geich-Gimbel, Ch.; Giacomelli, G.; Giacomelli, P.; Glenzinskí, D.; Goldberg, J.; Grandi, C.; Graham, K.; Gross, E.; Grunhaus, J.; Gruwé, M.; Günther, P. O.; Gupta, A.; Hajdú, C.; Hanson, G.; Harder, K.; Harel, A.; Harin-Dirac, M.; Hauschild, M.; Hawkes, C. M.; Hawkings, R. J.; Hemingway, R. J.; Hensel, C.; Herten, G.; Heuer, R. D.; Hill, J. C.; Hoffman, K. D.; Homer, R. J.; Honma, A. K.; Horváth, D.; Hossain, K. R.; Howard, Robert; Hüntemeyer, P.; Igo‐Kemenes, P.; Ishii, K.; Jawahery, A.; Jérémie, H.; Jones, C. R.; Jovanović, P.; Junk, T. R.; Kanaya, N.; Kanzaki, J.; Karapetian, G.; Karlen, D.; Kartvelishvili, V.; Kawagoe, K.; Kawamoto, T.; Keeler, R.; Kellogg, R. G.; Kennedy, B. W.; Kim, D. H.; Klein, K.; Klier, A.; Kluth, S.; Kobayashi, T.; Kobel, M.; Kokott, T. P.; Komamiya, S.; Kowalewski, R.; Krämer, T.; Kress, T.; Krieger, P.; Krogh, J. von; Krop, D.; Kühl, T.; Küpper, M.; Kyberd, P.; Lafferty, G. D.; Landsman, H.; Lanske, D.; Lawson, I.; Layter, J. G.; Leins, A.; Lellouch, D.; Letts, J.; Levinson, L. J.; Liebisch, R.; Lillich, J.; Littlewood, C.; Lloyd, A. W.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Losty, M. J.; Lu, J.; Ludwig, J.; Macchiolo, A.; Macpherson, A.; Mader, W. F.; Marcellini, S.; Marchant, T. E.; Martin, A. J.; Martín, J. P.; Martı́nez, G.; Mäshimo, T.; Mättig, P.; McDonald, W. J.; McKenna, J. A.; McMahon, T. J.; McPherson, R. A.; Meijers, F.; Mendez-Lorenzo, P.; Menges, W.; Merritt, F. S.; Mes, H.; Michelini, A.; Mihara, S.; Mikenberg, G.; Miller, D. J.; Mohr, W.; Montanari, A.; Mori, T.; Nagai, K.; Nakamura, I.; Neal, H. A.; Nisius, R.; O’Neale, S. W.; Oakham, F. G.; Odorici, F.; Oh, A.; Okpara, A.; Oreglia, M. J.; Orito, S.; Pahl, C.; Pásżtor, G.; Pater, J. R.; Patrick, G. N.; Pilcher, J. E.; Pinfold, J. L.; Plane, D. E.; Poli, B.; Polok, J.; Pooth, O.; Quadt, A.; Rabbertz, K.; Rembser, C.; Renkel, P.; Rick, H.; Rodning, N.; Roney, J. M.; Rosati, S.; Roscoe, K.; Rossi, Antônio; Rozen, Y.; Runge, K.; Runólfsson, Ö.; Rust, D. R.; Sachs, K.; Saeki, T.; Sahr, O.; Sarkisyan, E. K.G.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharff-Hansen, P.; Schrüder, M.; Schumacher, M.; Schwick, C.; Scott, W. G.; Seuster, R.; Shears, T.; Shen, B. C.; Shepherd‐Themistocleous, C. H.; Sherwood, P.; Siroli, G. P.; Skuja, A.; Smith, A. M.; Snow, G. A.; Sobie, R.; Söldner-Rembold, S.; Spagnolo, S.; Spanò, F.; Sproston, M.; Stahl, A.; Stephens, K.; Strom, D.; Ströhmer, R.; Stumpf, L.; Surrow, B.; Talbot, S. D.; Tarem, S.; Taševský, M.; Taylor, R. J.; Teuscher, R. J.; Thomas, J. P.; Thomson, M. A.; Torrence, E.; Towers, S.; Toya, D.; Trefzger, T.; Trigger, I. M.; Trocsanyi, Z. L.; Tsur, E.; Turner-Watson, M. F.; Ueda, I.; Vachon, B.; Vollmer, C. F.; Vannerem, P.; Verzocchi, M.; Voss, H.; Vossebeld, J.; Waller, D.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wengler, T.; Wermes, N.; Wilson, G. W.; Wilson, J. A.; Wyatt, T. R.; Yamashita, Shinji; Zacek, V.; Zer-Zion, D.

doi:10.1007/s100520100699

Cited by 43 publications

(10 citation statements)

References 32 publications

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“…The different shape of the generator curves can be explained by the fact that the data was corrected to the parton level, whereas the MC samples where generated with full hadronisation. In |cos θ N R |, the hadronisation corrections [23] would change the MC shapes towards a better agreement. cos α 34 is captured slightly better for cos α 34 ≈ −1, when including additional jets.…”

Section: Unitarity Violationsmentioning

confidence: 99%

See 1 more Smart Citation

Matching tree-level matrix elements with interleaved showers

Lönnblad

Prestel

2012

J. High Energ. Phys.

172

154

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We present an implementation of the so-called Ckkw-l merging scheme for combining multi-jet tree-level matrix elements with parton showers. The implementation uses the transverse-momentum-ordered shower with interleaved multiple interactions as implemented in PYTHIA8. We validate our procedure using e + e − -annihilation into jets and vector boson production in hadronic collisions, with special attention to details in the algorithm which are formally sub-leading in character, but may have visible effects in some observables.We find substantial merging scale dependencies induced by the enforced rapidity ordering in the default PYTHIA8 shower. If this rapidity ordering is removed the merging scale dependence is almost negligible. We then also find that the shower does a surprisingly good job of describing the hardness of multi-jet events, as long as the hardest couple of jets are given by the matrix elements.The effects of using interleaved multiple interactions as compared to more simplistic ways of adding underlying-event effects in vector boson production are shown to be negligible except in a few sensitive observables.To illustrate the generality of our implementation, we also give some example results from di-boson production and pure QCD jet production in hadronic collisions.

show abstract

Section: Unitarity Violationsmentioning

confidence: 99%

“…Four jet angular correlations in e + e − collisions at E CM = 91.25 GeV, as measured by OPAL[23]. Up to four additional jets were included in the merged samples.…”

mentioning

confidence: 99%

Matching tree-level matrix elements with interleaved showers

Lönnblad

Prestel

2012

J. High Energ. Phys.

172

154

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show abstract

“…With a few notable exceptions not available for direct hadron-level MC comparisons, like the four-jet angles[13][14][15], observables directly sensitive to coherence[16], and colour-reconnection constraints[17][18][19][20][21][22][23].…”

mentioning

confidence: 99%

Revisiting radiation patterns in $$e^+e^-$$ e + e - collisions

Fischer¹,

Gieseke²,

Plätzer³

2014

Eur. Phys. J. C

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We propose four simple event-shape variables for semi-inclusive e + e − → 4-jet events. The observables and cuts are designed to be especially sensitive to subleading aspects of the event structure, and allow to test the reliability of phenomenological QCD models in greater detail. Three of them, θ 14 , θ * , and C, focus on soft emissions off 3-jet topologies with a small opening angle, for which coherence effects beyond the leading QCD dipole pattern are expected to be enhanced. A complementary variable, M 2 L /M 2 H , measures the ratio of the hemisphere masses in 4-jet events with a compressed scale hierarchy (Durham y 23 -y 34 ), for which subleading 1 → 3 splitting effects are expected to be enhanced. We consider several different parton-shower models, spanning both conventional and dipole/antenna ones, all tuned to the same e + e − reference data, and show that a measurement of the proposed observables would allow for additional significant discriminating power between the models.

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“…To start with, measurements in 3-jet events by OPAL give C A /C F = 2.232 ± 0.14 [30], while the 3-jet measurements by DELPHI lead to C A /C F = 2.26 ± 0.16 [31]. Studies of the electroweak 4-jet kinematic by ALEPH gives C A = 2.93 ± 0.60 and C F = 1.35 ± 0.27 [32], a similar analysis by OPAL quotes C A = 3.02 ± 0.56 and C F = 1.34 ± 0.30 [33] . In both 4-jet analyses there exists a strong, positive correlation between C A and C F .…”

Section: Introductionmentioning

confidence: 83%

Measuring QCD Splittings with Invertible Networks

et al. 2021

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QCD splittings are among the most fundamental theory concepts at the LHC. We show how they can be studied systematically with the help of invertible neural networks. These networks work with sub-jet information to extract fundamental parameters from jet samples. Our approach expands the LEP measurements of QCD Casimirs to a systematic test of QCD properties based on low-level jet observables. Starting with an toy example we study the effect of the full shower, hadronization, and detector effects in detail.

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A simultaneous measurement of the QCD colour factors and the strong coupling

Cited by 43 publications

References 32 publications

Matching tree-level matrix elements with interleaved showers

Matching tree-level matrix elements with interleaved showers

Revisiting radiation patterns in $$e^+e^-$$ e + e - collisions

Measuring QCD Splittings with Invertible Networks

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