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Making the most of missing transverse energy: Mass reconstruction from collimated decays

Spannowsky, Michael; Wymant, Chris

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Authors

Chris Wymant



Abstract

At hadron colliders invisible particles χ can be inferred only through observation of the transverse component of the vectorial sum of their momenta—missing ET or missing transverse energy (MET)—preventing reconstruction of the masses of their mother particles. Here we outline situations where prior prejudice about the event kinematics allows one to make the most of MET by decomposing it into its expected sum of transverse contributions, each of which may be promoted to a full four-momentum approximating the associated χ. Such prejudice arises when all χ in the event are expected to be light and (anti-)parallel to a visible object, due to spin correlations, back-to-back decays or boosted decays. We focus on the last of these, with boosted semi-invisibly decaying neutralinos widely motivated in supersymmetry (in the presence of light gravitinos, singlinos, photini or pseudo-Goldstini), and demonstrate our simple method’s ability to reconstruct sharp mass peaks from the MET decomposition.

Citation

Spannowsky, M., & Wymant, C. (2013). Making the most of missing transverse energy: Mass reconstruction from collimated decays. Physical Review D, 87(7), Article 074004. https://doi.org/10.1103/physrevd.87.074004

Journal Article Type Article
Publication Date Apr 4, 2013
Deposit Date Dec 12, 2014
Publicly Available Date May 21, 2015
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 87
Issue 7
Article Number 074004
DOI https://doi.org/10.1103/physrevd.87.074004

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Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review D 87, 074004 © 2013 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.





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