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doi:10.1103/physrevlett.101.192002

Cited by 59 publications

(16 citation statements)

References 17 publications

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“…Then one could compare these processes with the experimentally constrained FCNC partial decay width t ! Z þ jet, which is 3:7% from CDF [55] and 3:2% from DØ [56], respectively. However, the partial decay width of t !…”

Section: Observations and Conclusionmentioning

confidence: 98%

Constraining unparticles from top physics at the Tevatron

2012

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We study and analyze the recent observations of the top pair production ðp " p ! t " tÞ at the Tevatron through flavor conserving and flavor violating channels via vector and tensor unparticles. The unparticle sector is considered with the possibility of being a color singlet or octet. The modified unparticle propagator is used to investigate the contribution of these unparticles to the observed A t" t FB (forwardbackward asymmetry in top pair production) and the spin correlation at the Tevatron. We have also studied the impact of the flavor violating couplings of unparticles to the third generation quarks on (a) pair production of same sign tops/antitops ðp " p ! tt þ " t " tÞ at the Tevatron and (b) the partial top decay width for À U ðt ! uU V Þ. We find that a large region of parameter space is consistent with the measurements of the t " t production cross section, A t" t FB , and spin correlation coefficient at the Tevatron, and we observe that the top decay width measurement constrains the flavor violating coupling of vector unparticles more severely than the same sign top/antitop production at the Tevatron. We also predict the best point set in the model parameter space for specific choices of d U corresponding to 2 min , evaluated using the m t" t spectrum of A t" t FB from the data set of Run II of the Tevatron at the integrated luminosity 8:7 fb À1 . Our results and analysis are consistent even with unparticle theories that have broken scale invariance, as long as the infrared cutoff scale is much less than the top pair production threshold.

show abstract

Section: Observations and Conclusionmentioning

confidence: 98%

Constraining unparticles from top physics at the Tevatron

2012

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show abstract

“…We note that the searches for t → ch [65,66] do not provide any constraints on 2HDM type III in alignment limit since the top quark FCNC couplings with the SM Higgs vanish. The anomalous top decays via t → c/u V where V = γ, Z are explored at the Tevatron [67][68][69] and at the LHC [70][71][72][73], without finding any significant excess of signal events. However, these searches do not provide any meaningful constraints on 2HDM type III since the prediction is much suppressed by loop correction and EW couplings.…”

Section: Jhep12(2015)038mentioning

confidence: 99%

Exploring top quark FCNC within 2HDM type III in association with flavor physics

Kim

Yoon

Yuan

2015

J. High Energ. Phys.

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Abstract:The top quark flavor changing neutral current (FCNC) process is an excellent probe to search for new physics in top sector since the Standard Model expectation is extremely suppressed. We explore Higgs-mediated top quark FCNC, focusing on H-tc Yukawa coupling λ ct within the general two Higgs doublet model. After electroweak symmetry breaking the top quark FCNC couplings are included in the charged Higgs Yukawa sector so that they contribute to various processes in flavor physics. To probe λ ct , we study anomalous single top production and the same sign top pair production at the LHC in association with flavor physics from the tree-level processes B → D ( * ) τ ν, B → τ ν as well as from the loop-level processes B d → X s γ, B d,s − B d,s mixing. We perform combined analysis of all the constraints regarding the fine-tuning argument to fit the data and discuss future prospect. The recently updated measurements on B → D ( * ) τ ν still prefer large λ ct , but we show that the current bound on the same sign top pair production at the LHC gives the most significant upper bound on λ ct to be less than 10 ∼ 30 depending on neutral heavy Higgs masses. We also find that for the given upper bound on λ ct , B → D ( * ) τ ν put significant lower bound on H-τ -τ Yukawa coupling, and the bound is proportional to the charged Higgs mass.

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“…On the experimental side, rare top decays are being searched for at Tevatron [109,110] and LHC [111][112][113]. AT LAS collaboration has set upper limit on the branching ratio Br(t → cg) < 2.7 × 10 −4 at 95% C.L.…”

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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Search for the Flavor-Changing Neutral-Current Decayt→Zqinpp¯Collisions ats

Cited by 59 publications

References 17 publications

Constraining unparticles from top physics at the Tevatron

Constraining unparticles from top physics at the Tevatron

Exploring top quark FCNC within 2HDM type III in association with flavor physics

Light axigluon and single top production at the LHC

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