Challenging exclusive top quark pair production at low and high luminosity LHC

Martins, Daniel E.; Taševský, M.; Gonçalves, V. P.

doi:10.1103/physrevd.105.114002

Cited by 12 publications

(9 citation statements)

References 45 publications

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“…Refs. [26,27]). However, for this tagging to be possible, the invariant mass of the final state should be larger than 200 GeV.…”

Section: Resultsmentioning

confidence: 99%

Illuminating the charged leptons in the proton

Gonçalves¹,

Martins²

2022

Preprint

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The description of the structure of proton is fundamental in order to describe the standard model processes at the LHC as well as for the searching of New Physics. Quantum fluctuations imply the presence of photons and leptons inside the proton, which admit a parton distribution function (PDF). Although the lepton PDFs are expected to be small, its presence opens new production mechanisms. In order to explore the lepton -induced processes at the LHC, a precise determination of the leptonic content of the proton is needed. In this paper we propose to constrain the content of charged leptons inside the proton through the study of the QED Compton scattering in ultraperipheral proton -nucleus collisions at the LHC. We estimate the total cross sections and associated distributions considering different models for the lepton PDFs and distinct lepton flavours. We demonstrate that a future experimental analysis of this process is feasible and that it can be used to constrain the content of electrons, muons and taus inside the proton.

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“…Refs. [26,27]). However, for this tagging to be possible, the invariant mass of the final state should be larger than 200 GeV.…”

Section: Resultsmentioning

confidence: 99%

Illuminating the charged leptons in the proton

Gonçalves¹,

Martins²

2022

Preprint

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“…There is a large potential for other measurement, see e.g. SM exclusive dijets [10], SM exclusive 𝑡𝑡 ̅ [11,12], the gluon Wigner function [13], exclusive Higgs boson [14], ALP searches [15] or dark matter searches [16,17].…”

Section: Pos(lhcp2023)246mentioning

confidence: 99%

Overview of ATLAS forward proton detectors: status, performance and new physics results

Mlinarevic

2024

Proceedings of the Eleventh Annual Conference on Large Hadron Collider Physics — PoS(LHCP2023)

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A key focus of the physics program at the LHC is the study of head-on proton-proton collisions. However, an important class of physics can be studied for cases where the protons narrowly miss one another and remain intact. In such cases, the electromagnetic fields surrounding the protons can interact producing high-energy photon-photon collisions. Alternatively, interactions mediated by the strong force can also result in intact forward scattered protons, providing probes of quantum chromodynamics (QCD). In order to aid identification and provide unique information about these rare interactions, instrumentation to detect and measure protons scattered through very small angles is installed in the beam pipe far downstream of the interaction point. We describe the ATLAS Forward Proton 'Roman Pot' Detectors (AFP and ALFA), including their performance and status. The physics interest, as well as the newest results on diffractive interactions, are also discussed.

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“…This means that the invariant mass of the t t system reconstructed with the intact protons information heavily underestimates the true t t mass (see for example the diffractive mass fraction reported by CDF in [59] or figure 3 of ref. [31]). This process is therefore suppressed in the selection process.…”

Section: Background Modelingmentioning

confidence: 99%

“…It was demonstrated in [4] that this channel is an efficient precision probe of broad neutral particles. 1 The SM central exclusive production of t t has been investigated in recent phenomenological studies [29][30][31]. The process has not been observed experimentally, but a recent search by the CMS Collaboration has set an upper bound on its cross section of σ = 0.59 pb at 95% CL at 13 TeV [32].…”

Section: Introductionmentioning

confidence: 99%

Searching for anomalous top quark interactions with proton tagging and timing detectors at the LHC

Baldenegro

Bellora

Fichet

et al. 2022

J. High Energ. Phys.

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We study the LHC sensitivity to new broad neutral resonances produced in two-photon fusion and decaying to a top quark pair, γγ → $$ t\overline{t} $$ t t ¯ . This is probed in central exclusive $$ t\overline{t} $$ t t ¯ production in proton-proton collisions, pp → $$ pt\overline{t}p $$ pt t ¯ p . We use the tagging of the intact protons by PPS (CMS) and AFP (ATLAS) and consider the semi-leptonic $$ t\overline{t} $$ t t ¯ channel. The sensitivity is also mapped onto a set of dimension-8 $$ \gamma \gamma t\overline{t} $$ γγt t ¯ operators in the large mass limit. Using the kinematical correlations between the intact protons and the reconstructed $$ t\overline{t} $$ t t ¯ system, we obtain a sensitivity to the couplings of the dimension-8 operators of 1.4 10−11 GeV−4 at 95% CL. The sensitivity to the anomalous couplings is significantly improved down to about 7 10−12 GeV−4 if the proton time-of-flight is known with a precision of 20 ps in future measurements. The 95% CL sensitivity to broad neutral resonances reaches masses of order 1500 GeV when using timing information.

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Challenging exclusive top quark pair production at low and high luminosity LHC

Cited by 12 publications

References 45 publications

Illuminating the charged leptons in the proton

Illuminating the charged leptons in the proton

Overview of ATLAS forward proton detectors: status, performance and new physics results

Searching for anomalous top quark interactions with proton tagging and timing detectors at the LHC

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