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Title:

HIGHER ORDER QCD CORRECTIONS IN EXCLUSIVE CHARMLESS B DECAYS vorgelegt von

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We discuss exclusive charmless B decays within the Standard Model of particle physics. These decays play a central role in the on-going process to constrain the parameters of the CKM matrix and to clarify the nature of CP violation. In order to exploit the rich source of data that is currently being collected at the experiments, a systematic the...

We discuss exclusive charmless B decays within the Standard Model of particle physics. These decays play a central role in the on-going process to constrain the parameters of the CKM matrix and to clarify the nature of CP violation. In order to exploit the rich source of data that is currently being collected at the experiments, a systematic theoretical treatment of the complicated hadronic dynamics is strongly desired. QCD Factorization represents a model-independent framework to compute hadronic matrix elements from first principles. It is based on a power expansion in ΛQCD/mb and allows for the systematic implementation of perturbative corrections. In particular, we consider hadronic two-body decays as B → ππ and perform a conceptual analysis of heavy-to-light form factors which encode the strong interaction effects in semi-leptonic decays as B → πℓν. Concerning the hadronic decays we compute NNLO QCD corrections which are particularly important with respect to strong interaction phases and hence direct CP asymmetries. On the technical level, we perform a 2-loop calculation which is based on an automatized reduction algorithm and apply sophisticated techniques Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-06-21

Source:

http://edoc.ub.uni-muenchen.de/6845/1/Bell_Guido.pdf

http://edoc.ub.uni-muenchen.de/6845/1/Bell_Guido.pdf Minimize

Document Type:

text

Language:

en

DDC:

530 Physics *(computed)*

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

TTP09-02

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We compute the real part of the 2-loop vertex corrections for charmless hadronic B decays, completing the NNLO calculation of the topological tree amplitudes in QCD factorization. Among the technical aspects we show that the hard-scattering kernels are free of soft and collinear infrared divergences at the 2-loop level, which follows after an in...

We compute the real part of the 2-loop vertex corrections for charmless hadronic B decays, completing the NNLO calculation of the topological tree amplitudes in QCD factorization. Among the technical aspects we show that the hard-scattering kernels are free of soft and collinear infrared divergences at the 2-loop level, which follows after an intricate subtraction procedure involving evanescent four quark operators. The numerical impact of the considered corrections is found to be moderate, whereas the factorization scale dependence of the topological tree amplitudes is significantly reduced at NNLO. We in particular do not find an enhancement of the phenomenologically important ratio |C/T | from the perturbative calculation. 1 Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2010-04-06

Source:

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp09/ttp09-02/ttp09-02.pdf

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp09/ttp09-02/ttp09-02.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

NNLO vertex corrections in charmless hadronic B decays: Real

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We compute the real part of the 2-loop vertex corrections for charmless hadronic B decays, completing the NNLO calculation of the topological tree amplitudes in QCD factorization. Among the technical aspects we show that the hard-scattering kernels are free of soft and collinear infrared divergences at the 2-loop level, which follows after an in...

We compute the real part of the 2-loop vertex corrections for charmless hadronic B decays, completing the NNLO calculation of the topological tree amplitudes in QCD factorization. Among the technical aspects we show that the hard-scattering kernels are free of soft and collinear infrared divergences at the 2-loop level, which follows after an intricate subtraction procedure involving evanescent four quark operators. The numerical impact of the considered corrections is found to be moderate, whereas the factorization scale dependence of the topological tree amplitudes is significantly reduced at NNLO. We in particular do not find an enhancement of the phenomenologically important ratio |C/T | from the perturbative calculation. 1 Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-26

Source:

http://arxiv.org/pdf/0902.1915v1.pdf

http://arxiv.org/pdf/0902.1915v1.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

The transverse-momentum spectrum of Higgs bosons near threshold at NNLO

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We give next-to-next-to-leading order (NNLO) predictions for the Higgs production cross section at large transverse momentum in the threshold limit. Near the partonic threshold, all radiation is either soft or collinear to the final state jet which recoils against the Higgs boson. We find that the real emission corrections are of moderate size, ...

We give next-to-next-to-leading order (NNLO) predictions for the Higgs production cross section at large transverse momentum in the threshold limit. Near the partonic threshold, all radiation is either soft or collinear to the final state jet which recoils against the Higgs boson. We find that the real emission corrections are of moderate size, but that the virtual corrections are large. We discuss the origin of these corrections and give numerical predictions for the transverse-momentum spectrum. The threshold result is matched to the known NLO result and implemented in the public code PeTeR. Minimize

Publisher:

Springer Berlin Heidelberg

Year of Publication:

2014-11-01

Source:

Journal of High Energy Physics, 2014-11-01, Volume 2014, pp 1-18

Journal of High Energy Physics, 2014-11-01, Volume 2014, pp 1-18 Minimize

Document Type:

Regular Article - Theoretical Physics

Language:

En

Subjects:

Higgs Physics ; Resummation ; Renormalization Group ; QCD

Higgs Physics ; Resummation ; Renormalization Group ; QCD Minimize

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Title:

Transverse-momentum spectra of electroweak bosons near threshold at NNLO

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We obtain the next-to-next-to-leading order corrections to transverse-momentum spectra of W, Z and Higgs bosons near the partonic threshold. In the threshold limit, the electroweak boson recoils against a low-mass jet and all radiation is either soft, or collinear to the jet or the beam directions. We extract the virtual corrections from known r...

We obtain the next-to-next-to-leading order corrections to transverse-momentum spectra of W, Z and Higgs bosons near the partonic threshold. In the threshold limit, the electroweak boson recoils against a low-mass jet and all radiation is either soft, or collinear to the jet or the beam directions. We extract the virtual corrections from known results for the relevant two-loop four-point amplitudes and combine them with the soft and collinear two-loop functions as defined in Soft-Collinear Effective Theory. We have implemented these results in a public code PeTeR and present numerical results for the threshold resummed cross section of W and Z bosons at next-to-next-to-next-to-leading logarithmic accuracy, matched to next-to-leading fixed-order perturbation theory. The two-loop corrections lead to a moderate increase in the cross section and reduce the scale uncertainty by about a factor of two. The corrections are significantly larger for Higgs production. Minimize

Publisher:

Springer Berlin Heidelberg

Year of Publication:

2014-02-01

Source:

Journal of High Energy Physics, 2014-02-01, Volume 2014, pp 1-34

Journal of High Energy Physics, 2014-02-01, Volume 2014, pp 1-34 Minimize

Language:

En

Subjects:

Resummation ; QCD ; Standard Model

Resummation ; QCD ; Standard Model Minimize

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Title:

TTP08-49

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NNLO corrections to inclusive semileptonic B decays in the shape-function region

NNLO corrections to inclusive semileptonic B decays in the shape-function region Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-21

Source:

http://arxiv.org/pdf/0810.5695v2.pdf

http://arxiv.org/pdf/0810.5695v2.pdf Minimize

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text

Language:

en

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Title:

NNLO Vertex Corrections in charmless hadronic B decays: Imaginary part

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We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning...

We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning the technical aspects, we find that soft and collinear infrared divergences cancel in the hard-scattering kernels which demonstrates factorization at the 2-loop order. All results are obtained analytically including the dependence on the charm quark mass. The numerical impact of the NNLO corrections is found to be significant, in particular they lead to an enhancement of the strong phase of the colour-suppressed tree amplitude. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2008-07-01

Source:

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp07/ttp07-08/ttp07-08.pdf

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp07/ttp07-08/ttp07-08.pdf Minimize

Document Type:

text

Language:

en

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Title:

TTP08-49

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NNLO corrections to inclusive semileptonic B decays in the shape-function region

NNLO corrections to inclusive semileptonic B decays in the shape-function region Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2010-04-06

Source:

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp08/ttp08-49/ttp08-49.pdf

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp08/ttp08-49/ttp08-49.pdf Minimize

Document Type:

text

Language:

en

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Title:

NNLO vertex corrections in charmless hadronic B decays: Real

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We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning...

We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning the technical aspects, we find that soft and collinear infrared divergences cancel in the hard-scattering kernels which demonstrates factorization at the 2-loop order. All results are obtained analytically including the dependence on the charm quark mass. The numerical impact of the NNLO corrections is found to be significant, in particular they lead to an enhancement of the strong phase of the colour-suppressed tree amplitude. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-22

Source:

http://arxiv.org/pdf/0705.3127v1.pdf

http://arxiv.org/pdf/0705.3127v1.pdf Minimize

Document Type:

text

Language:

en

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Title:

NNLO vertex corrections in charmless hadronic B decays: Real

Author:

Description:

We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning...

We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B → ππ. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning the technical aspects, we find that soft and collinear infrared divergences cancel in the hard-scattering kernels which demonstrates factorization at the 2-loop order. All results are obtained analytically including the dependence on the charm quark mass. The numerical impact of the NNLO corrections is found to be significant, in particular they lead to an enhancement of the strong phase of the colour-suppressed tree amplitude. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-22

Source:

http://arxiv.org/pdf/0705.3127v2.pdf

http://arxiv.org/pdf/0705.3127v2.pdf Minimize

Document Type:

text

Language:

en

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