Tagging the initial-state gluon

AbstractWe study the production of an electroweak boson in association with jets, in processes where the jet with the highest transverse momentum is identified as quark-initiated. The quark/gluon tagging procedure is realised by a cut on a jet angularity and it is therefore theoretically well-defined and exhibits infrared and collinear safety. In this context, exploiting resummed perturbation theory, we are able to provide theoretical predictions for transverse momentum distributions at a well-defined and, in principle, systematically improvable accuracy. In particular, tagging the leading jet as quark-initiated allows us to enhance the initial-state gluon contribution. Thus these novel transverse momentum distributions are potentially interesting observables to probe the gluonic degrees of freedom of the colliding protons.

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A hydrodynamic model including phase transition and the thermal motion-induced transverse momentum distributions in high energy heavy ion collisions

International Journal of Modern Physics E ◽

10.1142/s0218301317500458 ◽

2017 ◽

Vol 26 (07) ◽

pp. 1750045

Author(s):

Z. J. Jiang ◽

J. Q. Hui ◽

Y. Zhang

Keyword(s):

Phase Transition ◽

Transverse Momentum ◽

Hydrodynamic Model ◽

Good Description ◽

Heavy Ion ◽

High Energy ◽

Thermal Motion ◽

Ion Collisions ◽

Momentum Distributions ◽

Theoretical Predictions

By taking into account the effects of thermal motion, the transverse momentum distributions of identified charged particles produced in nucleus collisions are discussed in the context of a hydrodynamic model including phase transition. A comparison is made between the theoretical predictions and experimental measurements. The theoretical model gives a good description to the data collected in Au–Au collisions at RHIC energy of [Formula: see text][Formula: see text]GeV. For Pb–Pb collisions at LHC energy of [Formula: see text][Formula: see text]TeV, the model works well up to the transverse momentum of about [Formula: see text][Formula: see text]GeV/c.

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Upsilon Transverse Momentum at Hadron Colliders

International Journal of Modern Physics A ◽

10.1142/s0217751x05027515 ◽

2005 ◽

Vol 20 (16) ◽

pp. 3753-3755 ◽

Cited By ~ 2

Author(s):

Edmond L. Berger ◽

Jianwei Qiu ◽

Yili Wang

Keyword(s):

Perturbation Theory ◽

Transverse Momentum ◽

Strong Coupling ◽

Cross Section ◽

Impact Parameter ◽

Hadron Colliders ◽

Initial State ◽

Small Impact ◽

Small Impact Parameter ◽

Perturbative Contribution

We predict the shape of the transverse momentum pT spectrum of ϒ production. The distribution at low pT is dominated by the region of small impact parameter b and may be computed reliably in perturbation theory. We resum to all orders in the strong coupling αs the process-independent large logarithmic contributions that arise from initial-state gluon showers in the small pT(≤ Mϒ) region. The cross section at large pT is represented by the [Formula: see text] lowest-order non-vanishing perturbative contribution.

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ResBos and ePump Analysis on ATLAS 8TeV Z Boson Transverse Momentum Distributions

International Journal of Theoretical Physics ◽

10.1007/s10773-021-04852-7 ◽

2021 ◽

Author(s):

Qaynar Jandaolet ◽

Alim Ablat ◽

Pazilet Obul ◽

Reyima Rashidin ◽

Ibrahim Sitiwaldi

Keyword(s):

Transverse Momentum ◽

Z Boson ◽

Momentum Distributions

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Dual subtractions

Journal of High Energy Physics ◽

10.1007/jhep06(2021)089 ◽

2021 ◽

Vol 2021 (6) ◽

Author(s):

Renato Maria Prisco ◽

Francesco Tramontano

Keyword(s):

Field Theory ◽

Quantum Field ◽

Matrix Elements ◽

Leading Order ◽

Initial State ◽

Final State ◽

Dual Representation ◽

Subtraction Scheme ◽

Theoretical Predictions ◽

Perturbative Quantum

Abstract We propose a novel local subtraction scheme for the computation of Next-to-Leading Order contributions to theoretical predictions for scattering processes in perturbative Quantum Field Theory. With respect to well known schemes proposed since many years that build upon the analysis of the real radiation matrix elements, our construction starts from the loop diagrams and exploits their dual representation. Our scheme implements exact phase space factorization, handles final state as well as initial state singularities and is suitable for both massless and massive particles.

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Constraints on neutrino non-standard interactions from LHC data with large missing transverse momentum

Journal of High Energy Physics ◽

10.1007/jhep02(2021)033 ◽

2021 ◽

Vol 2021 (2) ◽

Author(s):

DianYu Liu ◽

ChuanLe Sun ◽

Jun Gao

Keyword(s):

Transverse Momentum ◽

Neutral Current ◽

Data Sets ◽

Leading Order ◽

Missing Transverse Momentum ◽

Upper Limit ◽

Theoretical Predictions ◽

Parton Showering ◽

Single Jet

Abstract The possible non-standard interactions (NSIs) of neutrinos with matter plays important role in the global determination of neutrino properties. In our study we select various data sets from LHC measurements at 13 TeV with integrated luminosities of 35 ∼ 139 fb−1, including production of a single jet, photon, W/Z boson, or charged lepton accompanied with large missing transverse momentum. We derive constraints on neutral-current NSIs with quarks imposed by different data sets in a framework of either effective operators or simplified Z′ models. We use theoretical predictions of productions induced by NSIs at next-to-leading order in QCD matched with parton showering which stabilize the theory predictions and result in more robust constraints. In a simplified Z′ model we obtain a 95% CLs upper limit on the conventional NSI strength ϵ of 0.042 and 0.0028 for a Z′ mass of 0.2 and 2 TeV respectively. We also discuss possible improvements from future runs of LHC with higher luminosities.

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