Prospects of type-II seesaw models at future colliders in light of the DAMPE e+e excess

Yicong Sui (Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA) ; Yongchao Zhang (Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA)

The DAMPE e+e excess at around 1.4 TeV could be explained in the type-II seesaw model with a scalar dark mater D which is stabilized by a discrete Z2 symmetry. The simplest scenario is the annihilation DDH++H followed by the subsequent decay H±±e±e±, with both the DM and triplet scalars roughly 3 TeV with a small mass splitting. In addition to the Drell-Yan process at future 100 TeV hadron colliders, the doubly charged components could also be produced at lepton colliders like ILC and CLIC in the off shell mode and mediate lepton flavor violating processes e+ei±j (with ij). A wide range of parameter space of the type-II seesaw could be probed, which are well below the current stringent lepton flavor constraints.

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      "source": "APS", 
      "title": "Prospects of type-II seesaw models at future colliders in light of the DAMPE <math><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>\u2212</mo></msup></math> excess"
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      "value": "The DAMPE <math><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>\u2212</mo></msup></math> excess at around 1.4 TeV could be explained in the type-II seesaw model with a scalar dark mater <math><mi>D</mi></math> which is stabilized by a discrete <math><msub><mi>Z</mi><mn>2</mn></msub></math> symmetry. The simplest scenario is the annihilation <math><mi>D</mi><mi>D</mi><mo>\u2192</mo><msup><mi>H</mi><mrow><mo>+</mo><mo>+</mo></mrow></msup><msup><mi>H</mi><mrow><mo>\u2212</mo><mo>\u2212</mo></mrow></msup></math> followed by the subsequent decay <math><msup><mi>H</mi><mrow><mo>\u00b1</mo><mo>\u00b1</mo></mrow></msup><mo>\u2192</mo><msup><mi>e</mi><mo>\u00b1</mo></msup><msup><mi>e</mi><mo>\u00b1</mo></msup></math>, with both the DM and triplet scalars roughly 3 TeV with a small mass splitting. In addition to the Drell-Yan process at future 100 TeV hadron colliders, the doubly charged components could also be produced at lepton colliders like ILC and CLIC in the off shell mode and mediate lepton flavor violating processes <math><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>\u2212</mo></mrow></msup><mo>\u2192</mo><msubsup><mrow><mo>\u2113</mo></mrow><mrow><mi>i</mi></mrow><mrow><mo>\u00b1</mo></mrow></msubsup><msubsup><mrow><mo>\u2113</mo></mrow><mrow><mi>j</mi></mrow><mrow><mo>\u2213</mo></mrow></msubsup></mrow></math> (with <math><mi>i</mi><mo>\u2260</mo><mi>j</mi></math>). A wide range of parameter space of the type-II seesaw could be probed, which are well below the current stringent lepton flavor constraints."
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Published on:
02 May 2018
Publisher:
APS
Published in:
Physical Review D , Volume 97 (2018)
Issue 9
DOI:
https://doi.org/10.1103/PhysRevD.97.095002
arXiv:
1712.03642
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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