Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays

In a recent publication by ATLAS collaboration a new observable, the so-called phi-star angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present,...

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Detalles Bibliográficos
Autores principales: Doan, Thi Kieu Oanh, Placzek, W., Was, Z.
Lenguaje:eng
Publicado: 2013
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2013.06.038
http://cds.cern.ch/record/1527336
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author Doan, Thi Kieu Oanh
Placzek, W.
Was, Z.
author_facet Doan, Thi Kieu Oanh
Placzek, W.
Was, Z.
author_sort Doan, Thi Kieu Oanh
collection CERN
description In a recent publication by ATLAS collaboration a new observable, the so-called phi-star angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present, it is estimated at the 0.3% level for the shape of the phi-star distribution. In this paper we discuss the possible effects of the second-order QED matrix element for that quantity. For that purpose, results from simulations based on the Yennie--Frautchi--Suura (YFS) exponentiation and featuring the second-order matrix elements are used and compared with the case when the matrix element is restricted to the first order. From this study we conclude that in order to reach the precision below 0.3% for the phi-star distribution at the LHC, inclusion of the second-order QED matrix element in a respective Monte Carlo event generator is necessary.
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spelling cern-15273362019-09-30T06:29:59Zdoi:10.1016/j.physletb.2013.06.038http://cds.cern.ch/record/1527336engDoan, Thi Kieu OanhPlaczek, W.Was, Z.Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decaysParticle Physics - PhenomenologyIn a recent publication by ATLAS collaboration a new observable, the so-called phi-star angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present, it is estimated at the 0.3% level for the shape of the phi-star distribution. In this paper we discuss the possible effects of the second-order QED matrix element for that quantity. For that purpose, results from simulations based on the Yennie--Frautchi--Suura (YFS) exponentiation and featuring the second-order matrix elements are used and compared with the case when the matrix element is restricted to the first order. From this study we conclude that in order to reach the precision below 0.3% for the phi-star distribution at the LHC, inclusion of the second-order QED matrix element in a respective Monte Carlo event generator is necessary.In a recent publication by ATLAS collaboration a new observable, the so-called phi-star angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present, it is estimated at the 0.3% level for the shape of the phi-star distribution. In this paper we discuss the possible effects of the second-order QED matrix element for that quantity. For that purpose, results from simulations based on the Yennie--Frautchi--Suura (YFS) exponentiation and featuring the second-order matrix elements are used and compared with the case when the matrix element is restricted to the first order. From this study we conclude that in order to reach the precision below 0.3% for the phi-star distribution at the LHC, inclusion of the second-order QED matrix element in a respective Monte Carlo event generator is necessary.In a recent publication by ATLAS Collaboration a new observable, the so-called @f_@h^@? angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present, it is estimated at the 0.3% level for the shape of the @f_@h^@? distribution. In this Letter we discuss the possible effects of the second-order QED matrix element for that quantity. For that purpose, results from simulations based on the Yennie-Frautchi-Suura (YFS) exponentiation and featuring the second-order matrix elements are used and compared with the case when the matrix element is restricted to the first-order. From this study we conclude that in order to reach the precision below 0.3% for the @f_@h^@? distribution at the LHC, inclusion of the second-order QED matrix element in a respective Monte Carlo event generator is necessary.In a recent publication by ATLAS Collaboration a new observable, the so-called ϕη⁎ angle, was used for precise measurement of transverse Z momentum. One of the dominant systematic errors for this measurement originates from the theoretical control of QED final-state bremsstrahlung. At present, it is estimated at the 0.3% level for the shape of the ϕη⁎ distribution. In this Letter we discuss the possible effects of the second-order QED matrix element for that quantity. For that purpose, results from simulations based on the Yennie–Frautchi–Suura (YFS) exponentiation and featuring the second-order matrix elements are used and compared with the case when the matrix element is restricted to the first-order. From this study we conclude that in order to reach the precision below 0.3% for the ϕη⁎ distribution at the LHC, inclusion of the second-order QED matrix element in a respective Monte Carlo event generator is necessary.CERN-PH-TH-2013-040IFJPAN-IV-2013-2arXiv:1303.2220CERN-PH-TH-2013-040IFJPAN-IV-2013-2oai:cds.cern.ch:15273362013-03-12
spellingShingle Particle Physics - Phenomenology
Doan, Thi Kieu Oanh
Placzek, W.
Was, Z.
Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title_full Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title_fullStr Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title_full_unstemmed Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title_short Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays
title_sort observable phi-eta-star at lhc and second-order qed matrix element in z/gamma to l+ l- decays
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.physletb.2013.06.038
http://cds.cern.ch/record/1527336
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AT placzekw observablephietastaratlhcandsecondorderqedmatrixelementinzgammatolldecays
AT wasz observablephietastaratlhcandsecondorderqedmatrixelementinzgammatolldecays

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