QCD corrections to single top quark production in electron-photon interactions

Kühn, Johann H.; Sturm, Christian; Uwer, Peter

doi:10.1140/epjc/s2003-01259-4

Cited by 4 publications

(10 citation statements)

References 73 publications

(72 reference statements)

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“…and ?e collision modes including various beam polarizations [16]. The recently calculated NLO corrections to the single-top-quark production in ?e are well under control and rather small [17]. Single-top-quark production in ?e collisions is of special interest; the rate is smaller than the top-pair rate in e + e -only by a factor of 1/8 at 500-800 GeV energies, and it becomes the dominant LC processes for top production at a multi-TeV LC like CLIC.…”

Section: Single Top Productio Nmentioning

confidence: 97%

Expectations from LHC and LC on Top Physics

Cobal¹

2005

AIP Conference Proceedings

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Section: Single Top Productio Nmentioning

confidence: 97%

Expectations from LHC and LC on Top Physics

Cobal¹

2005

AIP Conference Proceedings

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“…These formulas also appear in [9], except that in their Eq. (4.14) I coll gt,b the constant term should not be 5 but 3.…”

Section: Vector Boson Contributions At Tree Levelmentioning

confidence: 99%

“…Concerning the calculation of dσ V , the details can be found in Ref. [9]. We actually worked out this same computation before doing the case for the Z boson.…”

Section: Vector Boson Contributions At Tree Levelmentioning

confidence: 99%

“…In particular, the QCD corrections have been studied in Ref. [9]. Their conclusion is that the QCD correction is not very large (∼ 5%) so that this mode remains very well suited for a precise measurement of V tb .…”

Section: Introductionmentioning

confidence: 99%

“…Their conclusion is that the QCD correction is not very large (∼ 5%) so that this mode remains very well suited for a precise measurement of V tb . The approach used by [9] is to use the effective vector boson approximation, also known as effective W-approximation [6] (EWA) and to compute the QCD loop corrections for the W + γ → tb fusion process. Then, the convolution with the f W + /e + (x) distribution function is applied to obtain the correction to the actual e + γ process.…”

Section: Introductionmentioning

confidence: 99%

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QCD correction to single top quark production at the ILC

2011

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Higgs-boson production induced by bottom quarks

Boos¹,

Plehn²

2004

Phys. Rev. D

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Bottom-quark-induced processes are responsible for a large fraction of the CERN Large Hadron Collider ͑LHC͒ discovery potential, in particular, for supersymmetric Higgs bosons. Recently, the discrepancy between exclusive and inclusive Higgs boson production rates has been linked to the choice of an appropriate bottom factorization scale. We investigate the process kinematics at hadron colliders and show that it leads to a considerable decrease in the bottom factorization scale. This effect is the missing piece needed to understand the corresponding higher order results. Our results hold generally for charged and for neutral Higgs boson production at the LHC as well as at the Fermilab Tevatron. The situation is different for single top quark production, where we find no sizable suppression of the factorization scale. Turning the argument around, we can specify how large are the collinear logarithms that can be resummed using the bottom parton picture. I. HIGGS BOSONS AT THE LARGE HADRON COLLIDERThe combined CERN e ϩ e Ϫ collider LEP precision measurements ͓1͔ suggest the existence of a light Higgs boson. In the case of a single standard model Higgs boson the CERN Large Hadron Collider ͑LHC͒ promises multiple coverage for any Higgs boson mass, which will enable us to measure its different decay modes and extract the couplings ͓2͔. For a supersymmetric Higgs sector this coverage has to rely on fewer Higgs boson decay channels ͓2,3͔. This is a direct consequence of the structure of the Higgs sector: while the minimal supersymmetric standard model ͑MSSM͒ predicts a light Higgs boson, it also predicts an enhancement of the coupling to down-type fermions, at the expense of the branching fractions to gauge bosons. This enhancement is an outcome of the two Higgs doublet structure in the MSSM: one doublet is needed to give mass to up-type and the other to down-type fermions. The vacuum expectation values of the two doublets are different, parameterized by tan ␤ ϭv 2 /v 1 . In addition to a light scalar Higgs boson, the two Higgs doublet model includes a heavy scalar, a pseudoscalar, and a charged Higgs boson. None of these additional particles has a mass bounded from above, apart from triviality or unitarity bounds.Of course, observables linked to properties of a light Higgs boson can serve as a probe of whether a new scalar particle is indeed consistent with the standard model Higgs boson ͓4,5͔. There is, however, only one way to conclusively tell the supersymmetric Higgs sector from its standard model counterpart: to discover the additional heavy Higgs bosons and determine their properties.At the LHC, the possible enhancement of down-type fermion Yukawa couplings by powers of tan ␤ can render the search for a heavy scalar and pseudoscalar Higgs boson promising. For small values of tan ␤ the Yukawa coupling of the charged Higgs boson is governed by the top quark mass m t /tan ␤, whereas for larger values of tan ␤ the bottom Yukawa coupling m b tan ␤ dominates. While the chances of finding a heavy Higgs boson with a smal...

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QCD corrections to single top quark production in electron-photon interactions

Cited by 4 publications

References 73 publications

Expectations from LHC and LC on Top Physics

Expectations from LHC and LC on Top Physics

QCD correction to single top quark production at the ILC

Higgs-boson production induced by bottom quarks

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