First measurements of hadronic decays of the<i>Z</i>boson

Abrams, G. S.; Adolphsen, C.; Aleksan, R.; Alexander, J.; Averill, D.; Ballam, J.; Barish, B. C.; Barklow, T.; Barnett, B. A.; Bartelt, J.; Bethke, S.; Blockus, D.; Boer, W. De; Bonvicini, G.; Boyarski, A. M.; Brabson, B.; Breakstone, A.; Brom, J.-M.; Bulos, F.; Burchat, P. R.; Burke, D. L.; Cence, R. J.; Chapman, J. D.; Chmeissani, M.; Cords, D.; Coupal, D.P.; Dauncey, P.; DeStaebler, H.; Dorfan, D. E.; Dorfan, J.; Drell, P. S.; Drewer, D. C.; Elia, R.; Fay, J.; Feldman, G. J.; Fernandes, D.; Field, R. C.; Ford, W. T.; Fordham, C.; Frey, R.; Fujino, D.; Gan, K. K.; Gero, E.; Gidal, G.; Glanzman, T.; Goldhaber, G.; Cadenas, J. J. Gomez Y; Gratta, G.; Grindhammer, G.; Grosse‐Wiesmann, P.; Hanson, G.; Harr, R.; Harral, B.; Harris, F. A.; Hawkes, C. M.; Hayes, K.; Hearty, C.; Herrup, D.; Heusch, C. A.; Hildreth, M.; Himel, T.; Hinshaw, D. A.; Holmgren, S. O.; Hong, S. J.; Hutchinson, D. P.; Hylen, J.; Innes, W. R.; Jacobsen, R. G.; Jaffré, M.; Jaros, J. A.; Jung, C. K.; Kadyk, J.; Karlen, D.; Kent, J.; King, M.; Klein, S. R.; Koetke, D. S.; Komamiya, S.; Koska, W.; Kowalski, L. A.; Kozanecki, W.; Král, J.; Kuhlen, M.; Labarga, L.; Lankford, A. J.; Larsen, R. R.; Diberder, F. Le; Levi, M.E.; Litke, A. M.; Lüth, V.; Lynch, G.; McKenna, J. A.; Matthews, J. A. J.; Mattison, T. S.; Milliken, B.; Moffeit, K. C.; Munger, Charles T.; Murray, W. N.; Nash, J.A.; Nitz, D.; Ogren, H. O.; Ong, R. A.; O’Shaughnessy, K.; Parker, S. I.; Peck, C.; Perl, M.; Perrier, Frédéric; Petersen, A.; Petradza, M.; Pitthan, R.; Porter, F. C.; Rankin, P.; Richman, J. D.; Riles, K.; Rouse, F.; Rust, D. R.; Sadrozinski, H. F-W.; Schaad, M. W.; Schalk, T.; Schumm, B. A.; Schwarz, A. S.; Seiden, A.; Smith, J. G.; Snyder, A.; Soderstrom, E.; Stoker, D. P.; Stroynowski, R.; Swartz, M.; Thun, R.; Trilling, G. H.; Kooten, R. Van; Voruganti, P.; Wagner, S. R.; Watson, S.; Weber, P.; Weigend, A.; Weinstein, A. J.; Weir, A. J.; Wicklund, E.; Wolf, Roger; Wood, D.; Woods, M.; Wormser, G.; Wright, R. M.; Wu, D. Y.; Yurko, M.; Zaccardelli, C.; Zanthier, C. von

doi:10.1103/physrevlett.63.1558

Cited by 33 publications

(9 citation statements)

References 24 publications

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“…Event shape observables have been used to study QCD and measure α S [118,119,120,121,122,123,124,125,126,127,128,129,130,131,132]. There have been several observables developed to quantify the degree to which a collider event is isotropic versus jetlike, including thrust [118,133,134], sphericity [135,136], spherocity [137], and the C-and D-parameters [138,139,140].…”

Section: Phenomenologymentioning

confidence: 99%

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Albouy,

Barron,

Beauchesne

et al. 2022

Preprint

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In this work, we consider the case of a strongly coupled dark/hidden sector, which extends the Standard Model (SM) by adding an additional non-Abelian gauge group. These extensions generally contain matter fields, much like the SM quarks, and gauge fields similar to the SM gluons. We focus on the exploration of such sectors where the dark particles are produced at the LHC through a portal and undergo rapid hadronization within the dark sector before decaying back, at least in part and potentially with sizeable lifetimes, to SM particles, giving a range of possibly spectacular signatures such as emerging or semi-visible jets. Other, non-QCD-like scenarios leading to soft unclustered energy patterns or glueballs are also discussed. After a review of the theory, existing benchmarks and constraints, this work addresses how to build consistent benchmarks from the underlying physical parameters and present new developments for the pythia Hidden Valley module, along with jet substructure studies. Finally, a series of improved search strategies is presented in order to pave the way for a better exploration of the dark showers at the LHC.6 Summary and Perspectives 90 7 Acknowledgements 92 * The spin-0 states also include the flavor-singlet η v , which, as discussed in Eq. 15, can be relatively heavy. However there is no way to take this into account for separateFlav=off.† Although the spin-1 states include the flavor-singlet ωv, analogous to the spin-0 η v , it is expected to be close in mass to the other spin-1 states, as noted in sec. 4.1.1.

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Section: Phenomenologymentioning

confidence: 99%

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Albouy,

Barron,

Beauchesne

et al. 2022

Preprint

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show abstract

“…We select events where the scalar transverse momentum sum satisfies i p T,i > 400 GeV for all visible particles in the rapidity range |y| < 2. 6 Visualizations of these events are shown in figure 13. We compare the efficiencies JHEP08( 2020 of three event shape observables: cylindrical event isotropy I cyl 160 , ring-like event isotropy I ring 32 , and rescaled transverse thrust T ⊥ .…”

Section: Top Pair Production Vs Qcd Dijetmentioning

confidence: 99%

“…Event shape observables have long provided useful insights into the structure of the SM and the underlying dynamics of quantum chromodynamics (QCD) [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Although…”

Section: Introductionmentioning

confidence: 99%

A robust measure of event isotropy at colliders

Cesarotti

Thaler

2020

J. High Energ. Phys.

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We introduce a new event shape observable — event isotropy — that quantifies how close the radiation pattern of a collider event is to a uniform distribution. This observable is based on a normalized version of the energy mover’s distance, which is the minimum “work” needed to rearrange one radiation pattern into another of equal energy. We investigate the utility of event isotropy both at electron-positron colliders, where events are compared to a perfectly spherical radiation pattern, as well as at proton-proton colliders, where the natural comparison is to either cylindrical or ring-like patterns. Compared to traditional event shape observables like sphericity and thrust, event isotropy exhibits a larger dynamic range for high-multiplicity events. This enables event isotropy to not only distinguish between dijet and multijet processes but also separate uniform N-body phase space configurations for different values of N. As a key application of this new observable, we study its performance to characterize strongly-coupled new physics scenarios with isotropic collider signatures.

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“…Thrust is an observable that quantifies the degree to which an event is pencil-like [61,62,111]. It has been experimentally measured [112][113][114][115][116][117][118][119][120][121][122][123][124] and theoretically calculated [125][126][127][128][129][130] in detail for electron-positron collisions. Thrust seeks to find an axis n (the "thrust axis") such that most of the radiation lies in the direction of either n or −n; i.e.…”

Section: Thrustmentioning

confidence: 99%

Energy Flow in Particle Collisions

Metodiev

2020

Preprint

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In this thesis, I introduce a new bottom-up approach to quantum field theory and collider physics, beginning from the observable energy flow: the energy distribution produced by particle collisions. First, I establish a metric space for collision events by comparing their energy flows. I unify many ideas spanning multiple decades, such as observables and jets, as simple geometric objects in this new space. Second, I develop a basis of observables by systematically expanding in particle energies and angles, encompassing many existing observables and uncovering new analytic structures. I highlight how the traditional criteria for theoretical calculability emerge as consistency conditions, due to the redundancy of describing an event using particles rather than its energy flow. Finally, I propose a definition of particle type, or flavor, which makes use of only observable information. This definition requires refining the notion of flavor from a per-event label to a statistical category, and I showcase its direct experimental applicability at colliders. Throughout, I synthesize concepts from particle physics with ideas from statistics and computer science to expand the theoretical understanding of particle interactions and enhance the experimental capabilities of collider data analysis techniques.

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First measurements of hadronic decays of theZboson

Cited by 33 publications

References 24 publications

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report

A robust measure of event isotropy at colliders

Energy Flow in Particle Collisions

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