Observation of planar three-jet events in e+e− annihilation and evidence for gluon bremsstrahlung

Bartel, W.; Canzler, T.; Cords, D.; Dittmann, P.; Eichler, R.; Felst, R.; Haidt, D.; Kawabata, S.; Krehbiel, H.; Naroska, B.; O’Neill, L. H.; Olsson, J. E.; Steffen, P.; Yen, W.L.; Elsen, E.; Helm, M.; Petersen, A.; Warming, P.; Weber, G.; Drumm, H.; Heintze, J.; Heinzelmann, G.; Heuer, R. D.; Krogh, J. von; Lennert, P.; Matsumura, H.; Nozaki, T.; Rieseberg, H.; Wagner, A.; Darvill, D.C.; Foster, F.; Hughes, G.; Wriedt, H.; Allison, J.; Armitage, John C.; Duerdoth, I. P.; Hassard, J.; Loebinger, F. K.; King, B. T.; Macbeth, A. A.; Mills, H. E.; Murphy, P. G.; Prosper, H.; Stephens, K.; Clarke, D.; Goddard, M.; Hedgecock, R.; Marshall, R.; Pearce, Gillian; Imori, M.; Kobayashi, Tatsuo; Komamiya, S.; Koshiba, M.; Minowa, M.; Orito, S.; Sato, Akira; Suda, T.; Takeda, Hiroshi; Totsuka, Y.; Watanabe, Y.; Yamada, S.; Yanagisawa, C.

doi:10.1016/0370-2693(80)90680-2

Cited by 179 publications

(38 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Transverse sphericity is a momentum space variable, commonly classified as an event shape observable [8]. Event shape analyses, well known from lepton collisions [9][10][11], also offer interesting possibilities in hadronic collisions, such as the study of hadronization effects, underlying event characterization and comparison of pQCD computations with measurements in high E T jet events [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at $\mathbf{\sqrt{s}=0.9},~\mathbf{2.76}~\mbox{and}~\mathbf{7}~\mbox{TeV}$

et al. 2012

View full text Add to dashboard Cite

Measurements of the sphericity of primary charged particles in minimum bias proton-proton collisions at √ s = 0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary charged tracks with p T > 0.5 GeV/c in |η| < 0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (N ch ) is reported for events with different p T scales ("soft" and "hard") defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low N ch , whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean p T with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.

show abstract

Section: Introductionmentioning

confidence: 99%

Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at $\mathbf{\sqrt{s}=0.9},~\mathbf{2.76}~\mbox{and}~\mathbf{7}~\mbox{TeV}$

et al. 2012

View full text Add to dashboard Cite

show abstract

“…A clear theoretical advantage of these event shapes is that they are calculable in perturbative Quantum Chromodynamics (pQCD). This was realized early on and the calculability ultimately resulted in the confirmation of the parton model and, with data from experiments at higher √ s, the discovery of the gluon in three jet events at PETRA [1][2][3][4].…”

Section: Introductionmentioning

confidence: 94%

Jet substructure at the Large Hadron Collider

Kogler¹,

Nachman²,

Schmidt³

et al. 2019

Rev. Mod. Phys.

193

141

View full text Add to dashboard Cite

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.

View full text Add to dashboard Cite

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.

show abstract

Observation of planar three-jet events in e+e− annihilation and evidence for gluon bremsstrahlung

Cited by 179 publications

References 22 publications

Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at $\mathbf{\sqrt{s}=0.9},~\mathbf{2.76}~\mbox{and}~\mathbf{7}~\mbox{TeV}$

Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at $\mathbf{\sqrt{s}=0.9},~\mathbf{2.76}~\mbox{and}~\mathbf{7}~\mbox{TeV}$

Jet substructure at the Large Hadron Collider

Calculating pull for non-singlet jets

Contact Info

Product

Resources

About