The Single Top Quark Physics

Boos, E.; Dudko, L.

doi:10.1142/s0217751x12300268

Cited by 17 publications

(7 citation statements)

References 127 publications

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“…The focus will be on high-precision measurements of the top-quark mass and of the top-quark couplings to the Z boson and the photon (Agashe et al, 2013;Baer et al, 2013;Bicer et al, 2014). Single top-quark production proceeds in an electron-photon collision, with one incoming lepton radiating off a photon and the other incoming lepton radiating off a W boson, resulting dominantly in a final state of a top quark plus a b quark plus a forward lepton (Boos and Dudko, 2012;Penunuri et al, 2011). The cross section for this process is about an order of magnitude smaller than that for tt production.…”

Section: Discussionmentioning

confidence: 99%

Single top-quark production at the Tevatron and the LHC

Giammanco

Schwienhorst

2018

Rev. Mod. Phys.

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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...

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Section: Discussionmentioning

confidence: 99%

Single top-quark production at the Tevatron and the LHC

Giammanco

Schwienhorst

2018

Rev. Mod. Phys.

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“…(EW SB), providing informations complementary to those that can be obtained from top pair production [54][55][56]. Single top production is also very sensitive to new physics effects, whose strength can be assessed by precise measurement of the production cross section.…”

Section: Jhep04(2014)170mentioning

confidence: 99%

Light axigluon and single top production at the LHC

Yue

Cao

Zeng

2014

J. High Energ. Phys.

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The light axigluon model can explain the Tevatron tt forward-backward asymmetry and at the same time satisfy the constraints from the electroweak precision measurement and the AT LAS and CM S data, which induces the flavor changing (F C) couplings of axigluon with the SM and new quarks. We investigate the effects of these F C couplings on the s-and t-channel single top productions at the LHC and the F C decays Z → bs+bs, t → cγ and cg. Our numerical results show that the light axigluon can give significantly contributions to single top production and the rare top decays t → cγ and cg.

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“…Choosing the momentum of the light-quark (q ′ ) in the final state ("spectator basis") as the spin quantization axis leads to high degree polarization for the top quark (P = 97%). There is another basis which is called "beam line" basis where the polarization degree is less than the spectator basis [27], [29], [30], [31]. Now, we investigate the spin correlation in the process of qb → q ′ tH and try to obtain the the degree of polarization in the spectator basis for this process.…”

Section: Spin Correlation In Qb → Q ′ Thmentioning

confidence: 99%

Angular Correlations in Associated Production of Single Top and Higgs with and without Anomalous W t b Couplings

Taghavi

Najafabadi

2014

Int J Theor Phys

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We study the angular correlation and the amount of top quark polarization in the production of a higgs boson in association with a single top quark in the t−channel at the LHC. We also study the effect of anomalous W tb couplings on the angular correlation and on the production cross section of the process. The cross section and angular correlation is almost insensitive to the variation of the Higgs boson mass within 3 GeV. The robustness of the angular correlation against the center-of-mass energy of the proton-proton collision, the variation of parton distribution functions, and the change of factorization scale is investigated. The sensitivity of this process to the anomalous couplings is examined.PACS number(s): 14.65. Ha, 14.80.Bn,

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The Single Top Quark Physics

Cited by 17 publications

References 127 publications

Single top-quark production at the Tevatron and the LHC

Single top-quark production at the Tevatron and the LHC

Light axigluon and single top production at the LHC

Angular Correlations in Associated Production of Single Top and Higgs with and without Anomalous W t b Couplings

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