Erratum: Heavy-quark production by polarized and unpolarized photons in next-to-leading order [Phys. Rev. D 51, 4808 (1995)]

Kamal, B.; Merebashvili, Z.; Contogouris, A.P.

doi:10.1103/physrevd.55.3229

Cited by 24 publications

(58 citation statements)

References 1 publication

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“…the contribution of the box diagram to the virtual corrections, can be written as where dσ Box /dvdw is defined in eq. (22) of [15]. Of course, the term proportional to C F is the Abelian part and only the term proportional to N C is relevant in this work.…”

Section: The Next-to-leading-order Cross Sectionmentioning

confidence: 99%

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Inclusive D production in $\gamma \gamma$ collisions: including the single-resolved contribution with massive quarks

Krämer

Spiesberger

2003

Eur. Phys. J. C

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We have calculated the next-to-leading order cross section for the inclusive production of charm quarks as a function of the transverse momentum p T and the rapidity in two approaches using massive or massless charm quarks. For the singleresolved cross section we have derived the massless limit from the massive theory. We find that this limit differs from the genuine massless version with MS factorization by finite corrections. By adjusting subtraction terms we establish a massive theory with MS subtraction which approaches the massless theory very fast with increasing transverse momentum. With these results and including the equivalent results for the direct cross section obtained previously as well as double-resolved contributions, we calculate the inclusive D * ± cross section in γγ collisions using realistic evolved non-perturbative fragmentation functions and compare with recent data from the LEP collaborations ALEPH, L3 and OPAL. We find good agreement.

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Section: The Next-to-leading-order Cross Sectionmentioning

confidence: 99%

“…(14), A 1 is given in appendix B of [15] and the coefficients A ′ i , i = 1, 2, 3 are written in appendix A of [10].…”

Section: The Next-to-leading-order Cross Sectionmentioning

confidence: 99%

Inclusive D production in $\gamma \gamma$ collisions: including the single-resolved contribution with massive quarks

Krämer

Spiesberger

2003

Eur. Phys. J. C

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“…Note that for simplicity we have made the conventional choice [9] µ r = µ f in (14) and in what follows (see [11] for an independent variation of µ f and µ r ). The scaling functions can be further decomposed depending on the electric charge of the heavy and light quarks, e Q and e q , respectively 4 :…”

mentioning

confidence: 99%

“…With the total partonic cross section in (14) at hand is is now straightforward to calculate the total hadronic heavy flavor photoproduction cross section via…”

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confidence: 99%

Next-to-leading order QCD corrections to the polarized photoproduction of heavy flavors

Bojak¹,

Stratmann²

1998

Physics Letters B

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We present a calculation of the next-to-leading order (O(α 2 s α)) QCD corrections to heavy flavor photoproduction with longitudinally polarized beams. We apply our results to study the longitudinal spin asymmetry for the total charm quark production cross section which will be utilized by the forthcoming COMPASS experiment at CERN to obtain first direct information on the polarized gluon density ∆g. We also briefly discuss the main theoretical uncertainties inherent in this calculation. In particular we demonstrate that the factorization scale dependence is considerably reduced in next-to-leading order.

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“…[3]. Resummation of large Sudakov and non-Sudakov logarithms due to soft gluon radiation and soft gluon and bottom-quark exchange in the virtual corrections has been taken into account [4].…”

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confidence: 99%

Heavy neutral MSSM Higgs bosons at the photon linear collider — a comparison of two analyses

et al. 2007

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Measurement of the heavy neutral MSSM Higgs bosons H and A production in the process γγ → A/H → bb at the Photon Linear Collider has been considered in two independent analyses [1,2] for the parameter range corresponding to the so-called "LHC wedge". Significantly different conclusions were obtained; signal to background ratio 36 vs. 2. Here assumptions and results of these two analyses are compared. We have found that differences in the final results are mainly due to different assumptions on γγ-luminosity spectra, jet definitions and selection cuts.Keywords: MSSM Higgs bosons, Photon Linear Collider, LHC wedge A photon-collider option of the future e + e − linear collider offers a unique possibility to produce neutral Higgs bosons as s-channel resonances. In this contribution two analyses [1,2] are compared which estimate the precision of the cross section measurement for the production of heavy neutral MSSM Higgs bosons in the process γγ → A/H → bb. Both analyses were focused on the so-called "LHC wedge", i.e. the region of intermediate values of tan β, tan β ≈ 4-10, and masses M A/H above 200 GeV, where the heavy bosons A and H may not be discovered at the LHC and at the first stage of the e + e − linear collider. In each of these analyses NLO corrections to signal and background processes were taken into account. As the results of the two approaches seem to differ significantly, we undertook the task of comparing them, focusing on the case of M A = 300 GeV with MSSM parameters tgβ = 7 and M 2 = µ = 200 GeV.In the first analysis [1] the NLO corrections to the background process γγ → bb have been calculated according to Ref. [3]. Resummation of large Sudakov and non-Sudakov logarithms due to soft gluon radiation and soft gluon and bottom-quark exchange in the virtual corrections has been taken into account [4]. The NLO-α s was normalized to α s (M Z ) = 0.119 and the scale given by the γγ invariant mass was used. In order to suppress gluon radiation slim two-jet configurations in the final state were selected; jets were defined within the Sterman-Weinberg criterion. If the radiated gluon energy was larger than 10% of the total γγ invariant energy and if, at the same time, the opening angles between all three partons in the final state were larger than 20 o , the event was classified as three-jet event and rejected. The interference between the signal and background processes has been taken 1

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Erratum: Heavy-quark production by polarized and unpolarized photons in next-to-leading order [Phys. Rev. D 51, 4808 (1995)]

Cited by 24 publications

References 1 publication

Inclusive D production in $\gamma \gamma$ collisions: including the single-resolved contribution with massive quarks

Inclusive D production in $\gamma \gamma$ collisions: including the single-resolved contribution with massive quarks

Next-to-leading order QCD corrections to the polarized photoproduction of heavy flavors

Heavy neutral MSSM Higgs bosons at the photon linear collider — a comparison of two analyses

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