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Title:

Complete Corrections of O(\alpha\alpha_s) to the Decay of the Z Boson into Bottom Quarks

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For the vertex corrections to the partial decay rate $\Gamma(Z \to b\bar{b})$ involving the top quark only the leading terms of order $\alpha\alpha_s$ in the $1/M_t$ expansion are known. In this work we compute the missing next-to-leading corrections. Thus at $O(\alpha\alpha_s)$ the complete corrections to the decay of the Z boson into bottom qu...

For the vertex corrections to the partial decay rate $\Gamma(Z \to b\bar{b})$ involving the top quark only the leading terms of order $\alpha\alpha_s$ in the $1/M_t$ expansion are known. In this work we compute the missing next-to-leading corrections. Thus at $O(\alpha\alpha_s)$ the complete corrections to the decay of the Z boson into bottom quarks are at hand. ; Comment: Latex, 11 pages, 1 figure included as ps-file. Two references changed. The complete paper is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp97/ttp97-52/ or via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ Minimize

Year of Publication:

1997-12-01

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

Top production above threshold: Electroweak and QCD corrections combined

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Top quark production in electron-positron annihilation is one of the benchmark reactions at a future linear collider. Both electroweak and QCD corrections are large, amounting to 10% or even more in specific kinematic regions. In this note we present a method which allows to combine the dominant terms from both sources, thus improving considerab...

Top quark production in electron-positron annihilation is one of the benchmark reactions at a future linear collider. Both electroweak and QCD corrections are large, amounting to 10% or even more in specific kinematic regions. In this note we present a method which allows to combine the dominant terms from both sources, thus improving considerably the result based on a simple addition of both corrections. ; Comment: 5 Pages, Talk presented by J. Kuehn at the Linear Collider Workshop, Sitges, Spain, April 1999 Minimize

Year of Publication:

1999-12-07

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

Polarization in Top Quark Production and Decay near Threshold

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Theoretical results are presented for top quarks produced in annihilation of polarized electrons on positrons. Polarization studies for $t\bar t$ pairs near threshold are free from hadronization ambiguities. This is due to the short lifetime of the top quark. Semileptonic decays are discussed as well as their applications in studying polarizatio...

Theoretical results are presented for top quarks produced in annihilation of polarized electrons on positrons. Polarization studies for $t\bar t$ pairs near threshold are free from hadronization ambiguities. This is due to the short lifetime of the top quark. Semileptonic decays are discussed as well as their applications in studying polarization dependent processes involving top quarks. The Green function formalism is applied to $t\bar t$ production at future $e^+e^-$ colliders with polarized beams. Lippmann--Schwinger equation is solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. The polarization dependent momentum distributions of top quarks and their decay products are calculated. ; Comment: 6 pages, LaTex (uses epsf.sty, 2 figures appended as uuencoded ps files). The complete paper, including figures, is also available via anonymous ftp at ttpux2.physik.uni-karlsruhe.de (129.13.102.139) as /ttp94-24/ttp94-24.ps, or via www at http://ttpux2.physik.uni-karlsruhe.de/preprints.html/ Minimize

Year of Publication:

1994-11-23

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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530 Physics *(computed)*

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Title:

Polarization in Top Quark Pair Production near Threshold

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The polarization dependent momentum distributions of top quarks and their decay products are calculated for $t\bar t$ production at future $e^+e^-$ colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the $S$-wave and $P$-wave Green functions are sol...

The polarization dependent momentum distributions of top quarks and their decay products are calculated for $t\bar t$ production at future $e^+e^-$ colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the $S$-wave and $P$-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. It is demonstrated that for the longitudinally polarized electron beam an optimally polarized sample of top quarks can be produced. ; Comment: 11 pages, LaTex (uses epsf.sty, 3 ps-figures appended as extra uuencoded file). The complete paper, including figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp94-28/ttp94-28.ps, or via www at http://ttpux2.physik.uni-karlsruhe.de/preprints.html Minimize

Year of Publication:

1994-11-25

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

Second Order QCD Corrections to $\Gamma(t \to Wb)$

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Corrections of $O(\alpha_s^2)$ to the decay of the top quark into a W boson and a bottom quark are calculated. The method is based on an expansion of the top quark propagator for small external momentum, q, as compared to the top quark mass, M_t. The physical point q^2 = M_t^2 is reached through Pad\'e approximations. The described method allows...

Corrections of $O(\alpha_s^2)$ to the decay of the top quark into a W boson and a bottom quark are calculated. The method is based on an expansion of the top quark propagator for small external momentum, q, as compared to the top quark mass, M_t. The physical point q^2 = M_t^2 is reached through Pad\'e approximations. The described method allows to take effects induced by a finite W boson mass into account. The numerical relevance of the result is discussed. Important cross-checks against recent results for the decay rate $b \to u l \bar\nu$ and the two-loop QED corrections to $\mu$-decay are performed. ; Comment: Latex, 21 pages, 1 figure included as ps-file. Minor changes; reference added. Version to be published in PRD. The complete paper is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-25/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ Minimize

Year of Publication:

1999-06-07

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

DDC:

539 Modern physics *(computed)*

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Title:

Second Order QCD Corrections to the Top Decay Rate

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We report on a recent calculation of the top decay rate up to order \alpha_s^2. It is based on asymptotic expansions of the off-shell top propagator, followed by a Pad\'e approximation in order to reach the physically relevant point q^2=Mt^2. ; Comment: Latex, 3+2 pages, 4 figures included as ps-files. Talk presented by R.H. at the International...

We report on a recent calculation of the top decay rate up to order \alpha_s^2. It is based on asymptotic expansions of the off-shell top propagator, followed by a Pad\'e approximation in order to reach the physically relevant point q^2=Mt^2. ; Comment: Latex, 3+2 pages, 4 figures included as ps-files. Talk presented by R.H. at the International Europhysics Conference on High Energy Physics (EPS-HEP99), Tampere, Finland, July 15-21, 1999. The paper, with figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-41/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ Minimize

Year of Publication:

1999-10-14

Document Type:

text

Subjects:

High Energy Physics - Phenomenology

High Energy Physics - Phenomenology Minimize

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Title:

Polarization in Top Pair Production and Decay near Threshold

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Theoretical results are presented for top quarks produced in annihilation of polarized electrons on positrons. Polarization studies for t t pairs near threshold are free from hadronization ambiguities. This is due to the short lifetime of the top quark. Semileptonic decays are discussed as well as their applications in studying polarization depe...

Theoretical results are presented for top quarks produced in annihilation of polarized electrons on positrons. Polarization studies for t t pairs near threshold are free from hadronization ambiguities. This is due to the short lifetime of the top quark. Semileptonic decays are discussed as well as their applications in studying polarization dependent processes involving top quarks. The Green function formalism is applied to t t production at future e + e \Gamma colliders with polarized beams. Lippmann--Schwinger equation is solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. The polarization dependent momentum distributions of top quarks and their decay products are calculated. 1 Introduction The top quark is the heaviest fermion of the Standard Model. Its large mass allows to probe deeply into the QCD potential for nonrelativistic t t system produced ne. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-04-15

Source:

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp94/ttp94-24/ttp94-24.ps

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp94/ttp94-24/ttp94-24.ps 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.

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Title:

Polarization in Top Quark Pair Production near Threshold

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The polarization dependent momentum distributions of top quarks and their decay products are calculated for t ¯ t production at future e + e \Gamma colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the S-wave and P-wave Green functions are solved ...

The polarization dependent momentum distributions of top quarks and their decay products are calculated for t ¯ t production at future e + e \Gamma colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the S-wave and P-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. It is demonstrated that for the longitudinally polarized electron beam an optimally polarized sample of top quarks can be produced. Work supported in part by KBN grant 2P30225206, by BMFT contract 056KA93P and by DFG contract 436POL173193S. y The complete paper, including figures, is also available via anonymous ftp at ttpux2.physik.uni-karlsruhe.de (129.13.102.139) as /ttp94-28/ttp94-28.ps, or via www at http://ttpux2.physik.uni-karlsruhe.de/preprints.html/ Introduction There i. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-04-13

Source:

ftp://ttpux2.physik.uni-karlsruhe.de/ttp94/ttp94-28/ttp94-28.ps

ftp://ttpux2.physik.uni-karlsruhe.de/ttp94/ttp94-28/ttp94-28.ps Minimize

Document Type:

text

Language:

en

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Title:

Polarization in Top Quark Pair Production near Threshold

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The polarization dependent momentum distributions of top quarks and their decay products are calculated for t t production at future e + e \Gamma colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the S-wave and P-wave Green functions are solved nu...

The polarization dependent momentum distributions of top quarks and their decay products are calculated for t t production at future e + e \Gamma colliders with polarized beams. The Green function formalism is applied to this reaction near energy threshold. The Lippmann--Schwinger equations for the S-wave and P-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. It is demonstrated that for the longitudinally polarized electron beam an optimally polarized sample of top quarks can be produced. Work supported in part by KBN grant 2P30225206, by BMFT contract 056KA93P and by DFG contract 436POL173193S. y The complete paper, including figures, is also available via anonymous ftp at ttpux2.physik.uni-karlsruhe.de (129.13.102.139) as /ttp94-28/ttp94-28.ps, or via www at http://ttpux2.physik.uni-karlsruhe.de/preprints.html/ Introduction Th. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-04-15

Source:

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp94/ttp94-28/ttp94-28.ps

http://www-ttp.physik.uni-karlsruhe.de/Preprints/ttp94/ttp94-28/ttp94-28.ps 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.

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Title:

Complete Corrections of $O(\alpha\alpha_s)$ to the Decay of the Z Boson into Bottom Quarks

Author:

Description:

For the vertex corrections to the partial decay rate $\Gamma(Z \to b\bar{b})$ involving the top quark only the leading terms of order $\alpha\alpha_s$ in the $1/M_t$ expansion are known. In this work we compute the missing next-to-leading corrections. Thus at $O(\alpha\alpha_s)$ the complete corrections to the decay of the Z boson into bottom qu...

For the vertex corrections to the partial decay rate $\Gamma(Z \to b\bar{b})$ involving the top quark only the leading terms of order $\alpha\alpha_s$ in the $1/M_t$ expansion are known. In this work we compute the missing next-to-leading corrections. Thus at $O(\alpha\alpha_s)$ the complete corrections to the decay of the Z boson into bottom quarks are at hand. Minimize

Year of Publication:

1997-12-03

Language:

eng

Subjects:

Particle Physics - Phenomenology

Particle Physics - Phenomenology Minimize

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