Single top quark production in heavy ion collisions at energies available at the CERN Large Hadron Collider

Baskakov, A.; Boos, E.; Dudko, L.; Lokhtin, I.; Snigirev, A.

doi:10.1103/physrevc.92.044901

Cited by 10 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With an order-of-magnitude larger data set collected in 2017, the multi-purpose ATLAS and CMS experiments may have the potential to study also single top-quark production at that energy, providing further input to PDF fits. Recently, topquark pair production has been observed in proton-lead collisions at √ s N N = 8.16 TeV (CMS Collaboration, 2017d), and it is expected that single top-quark measurements will also join the physics program with future heavy-ion runs at the LHC (Baskakov et al, 2015;d'Enterria et al, 2015). The single top-quark production cross section increases by a factor 30 to 40 for heavy ion runs at a possible future circular collider (d 'Enterria, 2017), which turns single top-quark events into precise probes.…”

Section: Discussionmentioning

confidence: 99%

Single top-quark production at the Tevatron and the LHC

Giammanco

Schwienhorst

2018

Rev. Mod. Phys.

View full text Add to dashboard Cite

This paper provides a review of the experimental studies of processes with a single top quark at the Tevatron proton-antiproton collider and the LHC proton-proton collider. Single top-quark production in the t-channel process has been measured at both colliders. The s-channel process has been observed at the Tevatron, and its rate has been also measured at the center-of-mass energy of 8 TeV at the LHC in spite of the comparatively harsher background contamination. LHC data also brought the observation of the associated production of a single top quark with a W boson as well as with a Z boson. The Cabibbo-Kobayashi-Maskawa matrix element |V tb | is extracted from the single-top-quark production cross sections, and t-channel events are used to measure several properties of the top quark and set constraints on models of physics beyond the Standard Model. Rare final states with a single top quark are searched for, as enhancements in their production rates, if observed, would be clear signs of new physics. * andrea.giammanco@uclouvain.be † schwier@pa.msu.edu arXiv:1710.10699v2 [hep-ex] 27 May 2018 13 4. s-channel 13 B. LHC 15 1. t-channel 15 2. W -associated (tW ) 18 3. tW plus tt in fiducial regions 21 4. s-channel 22 5. Z-associated (tZq) 25 C. Summary of the inclusive cross-section measurements 27 IV. SM parameter extraction and searches for new physics leading to anomalous couplings 29 A. Constraints on |V tb | and other CKM matrix elements 29 B. Cross section ratios as inputs for PDF extraction 32 C. Top-quark mass 33 D. tW b vertex structure 34 E. Searches for Flavor Changing Neutral Currents 37 F. H-associated single top-quark production (tH) 38 V. Conclusions and Outlook 42Acknowledgments 43References 44 1 The symbol x B is used to indicate the quantity "Bjorken x", i.e. the fraction of the incoming proton's total momentum involved in the parton-level scattering. 4insensitive to the b-quark PDF and can therefore act as a control process (Guffanti and Rojo, 2010). Moreover, the integrated or differential charge asymmetry in t-channel production provides a powerful input to constrain PDFs, similar to the case of W -boson production, in a region of x B very relevant for several searches. Examples of new physics that might influence t-channel production include a vector-like fourth generation quark with chromo-magnetic couplings (Nutter et al., 2012), a color triplet (Drueke et al., 2015), and FCNC interactions of the top quark with the gluon and the charm quark (Aguilar-Saavedra, 2009a). The s-channel mode is also sensitive to new resonances decaying to a top quark (Drueke et al., 2015), while the tW mode is sensitive to vector-like quarks (Aguilar-Saavedra, 2009b) and resonances decaying to a top quark and a W boson (Nutter et al., 2012). Experimentally, the study of top quarks proceeds by the reconstruction of its decay products. Almost all top quarks decay into a W boson and a b quark (Aaltonen et al., 2013(Aaltonen et al., , 2014aAbazov et al., 2011a; CMS Collaboration, 2014a). The former promptly decays ei...

show abstract

Section: Discussionmentioning

confidence: 99%

Single top-quark production at the Tevatron and the LHC

Giammanco

Schwienhorst

2018

Rev. Mod. Phys.

View full text Add to dashboard Cite

show abstract

“…In p-Pb collisions the cross sections efficiently probe the nuclear gluon PDFs in a wide range in momentum fraction x at high scale Q ∼ m t [943] (see Section 10.4.4). In Pb-Pb collisions, the top-quark observables are sensitive to the energy-loss of heavy quarks [1048] and by selecting boosted (very high p T ) top quarks one could also probe the QGP medium at later times as the decays of boosted top quarks get √ s-dependence of the cross sections for hard processes of interest for a heavy-ion programme, calculated with MCFM [1047] at the highest available order. The yields for a one month Pb-Pb run (L int = 6 nb −1 ) are also shown.…”

Section: Hard Processes In Nucleus-nucleus Collisions At the He-lhcmentioning

confidence: 99%

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Citron,

Dainese,

Grosse-Oetringhaus

et al. 2018

Preprint

123

View full text Add to dashboard Cite

The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus-nucleus) systems, the exploration of parton densities in nuclei in a broad (x, Q 2 ) kinematic range and the search for the possible onset of parton saturation. In order to address these scientific goals, high-luminosity Pb-Pb and p-Pb programmes are considered as priorities for Runs 3 and 4, complemented by high-multiplicity studies in pp collisions and a short run with oxygen ions. High-luminosity runs with intermediate-mass nuclei, for example Ar or Kr, are considered as an appealing case for extending the heavy-ion programme at the LHC beyond Run 4. The potential of the High-Energy LHC to probe QCD matter with newly-available observables, at twice larger center-of-mass energies than the LHC, is investigated.

show abstract

“…Furthermore, recent detailed studies show the possibilities of direct measurements of large-mass elementary particles such as Higgs boson and top-quark via heavyion collision at the multi-TeV CERN-LHC and proposed future circular collider (FCC) [119,120]. Double-top or The results from other groups such as AT12 [23], EPS09 [28], HKN07 [31], nDS [37] and DSSZ [40] have been shown for comparisons.…”

Section: Nuclear Pdfs At the Lhc Eramentioning

confidence: 99%

Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

Khanpour

Tehrani²

2016

Phys. Rev. D

116

130

View full text Add to dashboard Cite

We perform a next-to-next-to-leading order (NNLO) analysis of nuclear parton distribution functions (nPDFs) using neutral current charged-lepton (ℓ ± + nucleus) deeply inelastic scattering (DIS) data and Drell-Yan (DY) cross-section ratios σ A DY /σ A ′ DY for several nuclear targets. We study in detail the parametrizations and the atomic mass (A) dependence of the nuclear PDFs at this order. The present nuclear PDFs global analysis provides us a complete set of nuclear PDFs, f2 ), with a full functional dependence on x, A, Q 2 . The uncertainties of the obtained nuclear modification factors for each parton flavour are estimated using the well-known Hessian method. The nuclear charm quark distributions are also added into the analysis. We compare the parametrization results with the available data and the results of other nuclear PDFs groups. We found our nuclear PDFs to be in reasonably good agreement with them. The estimates of errors provided by our global analysis are rather smaller than those of other groups. In general, a very good agreement is achieved. We also briefly review the recent heavy-ion collisions data including the first experimental data from the LHC proton+lead and lead+lead run which can be used in the global fits of nuclear PDFs. We highlight different aspects of the high luminosity Pb-Pb and p-Pb data which have been recorded by the CMS Collaboration.

show abstract

Single top quark production in heavy ion collisions at energies available at the CERN Large Hadron Collider

Cited by 10 publications

References 50 publications

Single top-quark production at the Tevatron and the LHC

Single top-quark production at the Tevatron and the LHC

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order

Contact Info

Product

Resources

About