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Implications of the CDF t t ¯ forward–backward asymmetry for boosted top physics

Implications of the CDF t t ¯ forward–backward asymmetry for boosted top physics,10.1016/j.physletb.2011.07.020,Physics Letters B,Kfir Blum,Cédric Del

Implications of the CDF t t ¯ forward–backward asymmetry for boosted top physics   (Citations: 3)
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New physics at a high scale Λ can affect top-related observables at O(1/Λ2) via the interference of effective four quark operators with the SM amplitude. The (u¯γμγ5Tau)(t¯γμγ5Tat) operator modifies the large Mtt¯ forward–backward asymmetry, and can account for the recent CDF measurement. The (u¯γμTau)(t¯γμTat) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O(1/Λ4) new physics effect.
Journal: Physics Letters B - PHYS LETT B , vol. 702, no. 5, pp. 364-369, 2011
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    • ...JHEP08(2011)031 as in [42]. This is consistent with the SM prediction [4, 44, 45], 700 = 80 8 fb. In [42], the inclusive t t cross section was also used as a constraint...
    • ...This is consistent with the SM prediction [4, 44, 45], 700 = 80 8 fb. In [42], the inclusive t t cross section was also used as a constraint...
    • ...This assumption is reasonable for the eective operators generated in the SM after the highly virtual gluon is integrated out [42]...
    • ...It is also intriguing to explore the implications of the new physics in the context of the CDF boosted jets study [8, 9]. The cross section for ultra-massive boosted jets (not coming from QCD events) can be estimated as follows [42]...
    • ...where b is the cross section of hadronically-decaying t t with a pT cut of 400 GeV on the leading jet and Rmass is a parameter that determines the QCD background, as dened in [42, 49]...
    • ...(An assumption of naive factorization of the jet mass distribution yieldsRmass = 1 , while matched Monte-Carlo simulations give Rmass = 0:87 [42, 49] with an excellent agreement on this value between the dierent generators.) The SM prediction for the top...
    • ...when the NP scale is roughly 5-10 TeV [42]...
    • ...Their eects at O(1= 2 ) in the hard Mt t regime were shown to be negligible in [42]...
    • ...Ref. [42] showed that it is possible to explain the forward-backward asymmetry measurement with onlyO 8 . It is instructive to examine the addition of non-interfering operators...
    • ...(Note that the central value A t t 450 0:4 requires a deviation of 1:8 in N700 , agreeing with [42] modulo the inclusion of 1= 4 eects.)...

    Cédric Delaunayet al. Implications of the CDF forward-backward asymmetry for hard top physic...

    • ...We do not perform a t to the spectrum, and only compare the prediction of our model for the cross section in a high invariant mass bin, 700 GeV< m t t < 800 GeV, following [21]...

    Zoltan Ligetiet al. Explaining the forward-backward asymmetry without dijet or flavor anom...

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