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Abouzaid, E.; Frisch, H.

doi:10.1103/physrevd.68.033014

Cited by 20 publications

(13 citation statements)

References 46 publications

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“…The conversion to the 't Hooft-Veltman scheme is performed by a finite shift [58] A (ren) 4) where N q stands for the number of light external quarks in the respective amplitude.…”

Section: Scheme Countertermmentioning

confidence: 99%

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NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

et al. 2018

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In this article we present the next-to-leading order QCD predictions for Wbb þ n-jet (n ¼ 0, 1, 2, 3) production at the Large Hadron Collider with ffiffi ffi s p ¼ 13 TeV. We work in the four-flavor number scheme with a nonvanishing bottom-quark mass and include all subprocesses at leading electroweak order as well as all heavy-fermion-loop effects. We show the impact of QCD corrections for total as well as differential cross sections and make an assessment of theoretical uncertainties of Wbb production viewed as an irreducible background to Hð→ bbÞW studies. For the calculations we have employed an upgraded version of the BLACKHAT library which can handle massive fermions in combination with SHERPA. Our results can be explored through publicly available n-tuple sets.

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“…The conversion to the 't Hooft-Veltman scheme is performed by a finite shift [58] A (ren) 4) where N q stands for the number of light external quarks in the respective amplitude.…”

Section: Scheme Countertermmentioning

confidence: 99%

“…Providing results as a function of the light-jet multiplicity is particularly beneficial, as one expects that universal behavior appears at large multiplicities [1][2][3][4], as for example studied in vector-boson production in association with multiple light jets in ref. [5].…”

Section: Introductionmentioning

confidence: 99%

NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

et al. 2018

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“…Assuming that the theoretical uncertainties are smaller than the statistical uncertainty, any deviations from the SM predictions may indicate the presence of new physics (see, for example, refs. [102][103][104]).…”

Section: Discussionmentioning

confidence: 99%

Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics

Malik

Watt

2014

J. High Energ. Phys.

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We motivate a measurement of various ratios of W and Z cross sections at the Large Hadron Collider (LHC) at large values of the boson transverse momentum (p T M W,Z ). We study the dependence of predictions for these cross-section ratios on the multiplicity of associated jets, the boson p T and the LHC centre-of-mass energy. We present the flavour decomposition of the initial-state partons and an evaluation of the theoretical uncertainties. We show that the W + /W − ratio is sensitive to the up-quark to down-quark ratio of parton distribution functions (PDFs), while other theoretical uncertainties are negligible, meaning that a precise measurement of the W + /W − ratio at large boson p T values could constrain the PDFs at larger momentum fractions x than the usual inclusive W charge asymmetry. The W ± /Z ratio is insensitive to PDFs and most other theoretical uncertainties, other than possibly electroweak corrections, and a precise measurement will therefore be useful in validating theoretical predictions needed in data-driven methods, such as using W (→ ν)+jets events to estimate the Z(→ νν)+jets background in searches for new physics at the LHC. The differential W and Z cross sections themselves, dσ/dp T , have the potential to constrain the gluon distribution, provided that theoretical uncertainties from higher-order QCD and electroweak corrections are brought under control, such as by inclusion of anticipated next-to-next-to-leading order QCD corrections.

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“…production to validate the lepton identification and trigger efficiencies in the Monte Carlo simulation predictions of signal and SM background to about 2%. This technique, which parallels that used in the search, will be used for precision comparisons with the standard model at the LHC [8].…”

Section: Introductionmentioning

confidence: 99%

“…The technique presented here is specifically designed to reduce systematic errors by using ratios of W and Z boson events, important for much larger integrated luminosities [8]. The acceptance for t " t !…”

Section: Introductionmentioning

confidence: 99%

Search for the neutral current top quark decayt→Zcusing the ratio ofZ-boson+4 jetsto
Aaltonen¹,
Adelman²,
Akimoto³
et al. 2009
Phys. Rev. D
4
0
4
0
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We have used the Collider Detector at Fermilab (CDF-II) to search for the flavor-changing neutralcurrent (FCNC) top-quark decay t ! Zc using a technique employing ratios of W and Z production, measured in p " p data corresponding to an integrated luminosity of 1:52 fb À1 . The analysis uses a comparison of two decay chains, p " p ! t " t ! WbWb ! ' bjjb and p " p ! t " t ! ZcWb ! ''cjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the modeling of acceptance and efficiency for lepton identification over the multiyear data set using another ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z bosons. To improve the discrimination against standard model backgrounds to top-quark decays, we calculate the top-quark mass for each event with two leptons and four jets assuming it is a t " t event with one of the top quarks decaying to Zc. For additional background discrimination we require at least one jet to be identified as originating from a b quark. No significant signal is found and we set an upper limit on the FCNC branching ratio Brðt ! ZcÞ using a likelihood constructed from the ''cjjb top-quark mass distribution and the number of ' bjjb events. Limits are set as a function of the helicity of the Z boson produced in the FCNC decay. For 100% longitudinally-polarized Z bosons we find limits of 8.3% and 9.3% (95% C.L.) depending on the assumptions regarding the theoretical top-quark pair production cross section.

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Ratio ofW+Njets toZ0/γ*+

Cited by 20 publications

References 46 publications

NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics

Search for the neutral current top quark decayt→Zcusing the ratio ofZ-boson+4 jetsto
Aaltonen¹,
Adelman²,
Akimoto³
et al. 2009
Phys. Rev. D
4
0
4
0
View full text Add to dashboard Cite

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Ratio ofW+Njets toZ0/γ*+

Cited by 20 publications

References 46 publications

NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

NLO QCD predictions for Wbb¯ production in association with up to three light jets at the LHC

Ratios of W and Z cross sections at large boson p T as a constraint on PDFs and background to new physics

Search for the neutral current top quark decayt→Zcusing the ratio ofZ-boson+4 jetstoAaltonen1, Adelman2, Akimoto3 et al. 2009Phys. Rev. D4040View full textAdd to dashboardCite

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Product

Resources

About

Search for the neutral current top quark decayt→Zcusing the ratio ofZ-boson+4 jetsto
Aaltonen¹,
Adelman²,
Akimoto³
et al. 2009
Phys. Rev. D
4
0
4
0
View full text Add to dashboard Cite