Rare top quark decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>cV</mml:mi></mml:math>in the top-color-assisted technicolor model

Lu, G. R.; Yin, Fu-Rong; Wang, Xuelei; Wan, Lingde

doi:10.1103/physrevd.68.015002

Cited by 68 publications

(29 citation statements)

References 20 publications

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“…Such framework, however, would lead to more complicated particle spectra. 4 We also considered large tan β values and discuss it at the end of Section V B.…”

Section: T → CV In Lrsusymentioning

confidence: 99%

“…t → cV (V = g, γ, Z) have also been explored in two Higgs doublet models [1,2], technicolor models [3], top-color assisted technicolor models [4], models with extra vector singlets [5] and supersymmetry with [6,7,8,9,10,11,12], and without SUSY QCD and EW contributions [6] and obtained branching ratios of 10 −6 for t → cg and 10 −8 for t → cγ, Z. Couture et al included the left-handed squark mixing in their calculation [7] and obtained branching ratios of 10 −5 for the gluon, 10 −7 for the photon and 10 −6 for the Z boson. Inclusion of the right-handed squark mixing [8], did not change branching ratios significantly.…”

Section: Introductionmentioning

confidence: 99%

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t→cg,cγ,cZin the left-right supersymmetric model

Frank

Turan

2005

Phys. Rev. D

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We analyse top quark flavor violating decays into a charm quark and a gluon, photon or Z boson in a supersymmetric model incorporating left-right symmetry. We include loop calculations involving contributions from scalar quarks, gluinos, charginos and neutralinos. We perform the calculations first assuming the minimal (flavor diagonal) scalar quark scenario, and then allowing for arbitrary mixing between the second and third generation of scalar quarks, in both the up and down sectors. In each case we present separately the contributions from gluino, chargino and neutralino loops and compare their respective strengths. In the flavor-diagonal case, the branching ratio cannot exceed 10 −5 (10 −6 ) for the gluon (photon/Z boson); while for the unconstrained (flavor non-diagonal) case the same branching ratios can reach almost 10 −4 for the gluon, 10 −6 for the photon and 10 −5 for the Z boson, all of which are slightly below the expected reach of LHC.

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“…Such framework, however, would lead to more complicated particle spectra. 4 We also considered large tan β values and discuss it at the end of Section V B.…”

Section: T → CV In Lrsusymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

t→cg,cγ,cZin the left-right supersymmetric model

Frank

Turan

2005

Phys. Rev. D

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“…In the SM, the t → Zq branching ratio is expected to be of order 10 −14 [30]. However, in some BSM models [31,32,33] it can reach values up to about 10 −4 . Both CMS [34] and ATLAS [35] have searched for this in Run-1 data, with the best limit of 5 × 10 −4 (for 9 × 10 −4 expected) coming from CMS.…”

Section: Top Quark Physicsmentioning

confidence: 99%

SM and Higgs at HL-LHC

Krieger¹,

Collaborations²

2016

Proceedings of Fourth Annual Large Hadron Collider Physics — PoS(LHCP2016)

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The current LHC experimental program is scheduled to last until the end of 2023 and to result in a total data sample of about 300 fb −1 at a pp centre-of-mass energy close to the design value of 14 TeV. This will be followed by a high-luminosity phase in which the LHC instantaneous luminosity will be increased by a factor of up to 7.5 times the design value of 1 × 10 34 cm −2 s −1 , with the goal of accumulating a total dataset of about 3000 fb −1 over about a ten-year run period. This will require significant upgrades to both the accelerator infrastructure, and the detectors, which were not designed to operate under these conditions. The large anticipated data sample will allow for more precise investigations of topics already studied with the 300 fb −1 data sample, as well as for studies of processes that are accessible only with the much larger statistics. There will be a particular focus on investigations of the properties of the Higgs boson, which was discovered in 2012. Rates and signal strengths will be measured for a variety of production and decay modes, allowing extraction of the Higgs boson couplings. Particular final states will allow differential cross-sections to be measured for all production modes, and for studies of the Higgs width and CP properties, as well as the tensor structure of its coupling to bosons. An important part of the HL-LHC experimental program will be investigations of the Higgs self-coupling, which is accessible via studies of di-Higgs production. The program of other Standard Model measurements will also continue at the HL-LHC. Topics that have been investigated so far, for the HL-LHC, include Vector Boson Scattering as well as topics in b-and top-quark physics. Here, projections for performance at the HL-LHC will be discussed for both ATLAS and CMS.

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“…The branching ratios for the processes t → qγ and t → qg are of the order of 10 −14 -10 −12 in the SM [3,4]. In contrast, several BSM scenarios, such as the two-Higgs doublet model, supersymmetry or technicolour, predict much larger rates [5,6], of the order of 10 −6 -10 −5 . It implies that observation of the large FCNC-induced couplings tqγ and tqg would indicate the existence of BSM.…”

Section: Introductionmentioning

confidence: 98%

“…The enhanced FCNC tqγ and tqg interactions are predicted by many extensions of the SM which include new exotic quarks [7], new scalars [8,9], supersymmetry [5,[10][11][12][13][14], or technicolour [6,15]. The BSM effects can be described a e-mail: lgguoyuchen@126.com b e-mail: cxyue@lnnu.edu.cn by a minimal set of the higher order effective operators independently from the underlying theory [16].…”

Section: Introductionmentioning

confidence: 99%

Search for anomalous couplings via single top quark production in association with a photon at LHC

2016

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Considering the experimental constraints given by the CMS collaboration at √ s = 8 TeV on the strength of top quark flavour-changing neutral-current couplings tqγ and tqg, we investigate the production of top quark in association with a photon and carry out a full simulation for the signals νbγ and j jbγ at 14 TeV LHC. In our numerical analysis, the contributions of single top production with a photon radiation off the top decay products are also included. The discovery potential for anomalous couplings tqγ and tqg with an integrated luminosity of 100 fb −1 is examined in detail.

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Rare top quark decayst→cVin the top-color-assisted technicolor model

Cited by 68 publications

References 20 publications

t→cg,cγ,cZin the left-right supersymmetric model

t→cg,cγ,cZin the left-right supersymmetric model

SM and Higgs at HL-LHC

Search for anomalous couplings via single top quark production in association with a photon at LHC

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