Journal
PHYSICS LETTERS B
Volume 712, Issue 4-5, Pages 386-390Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.05.007
Keywords
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Funding
- EU ERC Advanced Grant FLAVOUR [267104]
- MIUR [2008XM9HLM]
- London Centre for Terauniverse Studies (LCTS)
- European Research Council [267352]
- Technische Universitat Munchen - Institute for Advanced Study
- German Excellence Initiative
- STFC [ST/J002798/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J002798/1] Funding Source: researchfish
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The ATLAS and CMS experiments at the LHC have reported the observation of a possible excess of events corresponding to a new particle it with mass similar to 125 GeV that might be the long-sought Higgs boson, or something else. Decyphering the nature of this possible signal will require constraining the couplings of the h and measuring them as accurately as possible. Here we analyze the indirect constraints on flavour-changing h decays that are provided by limits on low-energy flavour-changing interactions. We find that indirect limits in the quark sector impose such strong constraints that flavour-changing h decays to quark-antiquark pairs are unlikely to be observable at the LHC. On the other hand, the upper limits on lepton-flavour-changing decays are weaker, and the experimental signatures less challenging. In particular, we find that either B(h -> tau(mu) over bar + (mu) over bar tau) or B(h -> tau(e) over bar tau) could be O(10)%, i.e., comparable to B(h -> tau(+)tau(-)) and potentially observable at the LHC. (C) 2012 Elsevier B.V. All rights reserved.
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