Abstract
We propose a new jet algorithm for deep-inelastic scattering (DIS) that accounts for the forward-backward asymmetry in the Breit frame. The Centauro algorithm is longitudinally invariant and can cluster jets with Born kinematics, which enables novel studies of transverse-momentum-dependent observables. Furthermore, we show that spherically-invariant algorithms in the Breit frame give access to low-energy jets from current fragmentation. We propose novel studies in unpolarized, polarized, and nuclear DIS at the future Electron-Ion Collider.
Highlights
Understanding the structure of nucleons and nuclei in terms of quark and gluons remains an open goal
It is worthwhile to examine the relationship between our inclusive jet algorithm, and other observables traditionally used to examine the physics of jet production in the Breit frame
If we take R ∼ 1 and zjet → 1, the Centauro algorithm will generically find a “hemisphere” containing the struck quark, and 1 − zjet measures the energy that leaks out of this “hemisphere.” Part of the advantage of the inclusive algorithms proposed in this paper versus the previously used events shapes is that while it can act as an implicit event shape at large R and at threshold, capturing much the same physics as an event shape, one can interpolate into the fragmentation regime at small radius R or generic values of zjet: the physics that one can probe for is much richer, since one has not locked into representing events as single final state jet configuration
Summary
Understanding the structure of nucleons and nuclei in terms of quark and gluons remains an open goal. The HERA jet measurements in DIS targeted gluoninitiated processes by requiring large transverse momentum in the Breit frame [44] This suppresses the Born configuration, γÃq → q, which has recently been postulated as key to probe transverse-momentum dependent (TMD) PDFs [11,12,13]. Modern jet substructure techniques [45] offer new methods for precise QCD calculations and to control nonperturbative effects, e.g., grooming or a recoilfree axis can be used to minimize hadronization effects or study TMD evolution [46]. We suggest novel studies of jet energy and TMD observables
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