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

Spannowsky, Michael and Wymant, Chris (2013) 'Making the most of missing transverse energy : mass reconstruction from collimated decays.', Physical review D., 87 (7). 074004.


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.

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Publisher 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.
Date accepted:No date available
Date deposited:21 May 2015
Date of first online publication:April 2013
Date first made open access:No date available

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