Report/Journal Article

PUBDB-2015-02438

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interference effects in BSM processes with a generalised narrow-width approximation

Fuchs, E. (Corresponding author)DESY* ; Thewes, S. ; Weiglein, G.DESY*

2015
Springer Berlin

This record in other databases:        

Please use a persistent id in citations: doi:10.1140/epjc/s10052-015-3472-z  doi:10.3204/PUBDB-2015-02438

Report No.: DESY-14-194; arXiv:1411.4652

Abstract: A generalisation of the narrow-width approximation (NWA) is formulated which allows for a consistent treatment of interference effects between nearly mass-degenerate particles in the factorisation of a more complicated process into production and decay parts. It is demonstrated that interference effects of this kind arising in BSM models can be very large, leading to drastic modifications of predictions based on the standard NWA. The application of the generalised NWA is demonstrated both at tree level and at one-loop order for an example process where the neutral Higgs bosons h and H of the MSSM are produced in the decay of a heavy neutralino and subsequently decay into a fermion pair. The generalised NWA, based on on-shell matrix elements or their approximations leading to simple weight factors, is shown to produce UV- and IR-finite results which are numerically close to the result of the full process at tree level and at one-loop order, where an agreement of better than 1% is found for the considered process. The most accurate prediction for this process based on the generalised NWA, taking into account also corrections that are formally of higher orders, is briefly discussed.

Note: OA

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
2. 514 - Theoretical Particle Physics (POF2-514) (POF2-514)
3. VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500) (2015_IFV-VH-GS-500)
4. HIGGSTOOLS - The Higgs quest - exploring electroweak symmetry breaking at the LHC (316704) (316704)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Report Fuchs, E. (Corresponding Author)DESY* ; Thewes, S. C. ; Weiglein, G.DESY*
Interference effects in BSM processes with a generalised narrow-width approximation
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