Higgs phenomenology in the stealth doublet model
(2015) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 91(9). Abstract
 We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has treelevel Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no treelevel couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the... (More)
 We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has treelevel Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no treelevel couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the LHC. The charged scalar H+/ and the CPodd scalar A couple to fermions at oneloop level. We compute the decays of Hperpendicular to and A and in particular the oneloop decays A > f (f) over bar, Hperpendicular to > f (f) over bar', H+/ > W+/ Z and H+/ > W+/gamma. We also describe how to calculate and renormalize such processes in our model. We find that if one of H+/ or A is the lightest scalar, H+/ > W+/gamma or A > b (b) over bar are typically their respective dominating decay channels. Otherwise, the dominating decays of H+/ and A are into a scalar and a vector. Due to the absence of treelevel fermion couplings for H+/ and A, we consider pair production and associated production with vector bosons and scalars at the LHC. If the parameter space of the model that favors H+/ > W+/gamma. is realized in Nature, we estimate that there could be a considerable amount of such events in the present LHC data. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/7433029
 author
 Enberg, Rikard; Rathsman, Johan ^{LU} and Wouda, Glenn
 organization
 publishing date
 2015
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Physical Review D (Particles, Fields, Gravitation and Cosmology)
 volume
 91
 issue
 9
 publisher
 American Physical Society
 external identifiers

 wos:000353774700002
 scopus:84929376708
 ISSN
 15502368
 DOI
 10.1103/PhysRevD.91.095002
 language
 English
 LU publication?
 yes
 id
 354198ce919c43b593891205e486288a (old id 7433029)
 date added to LUP
 20150624 13:01:34
 date last changed
 20170910 03:03:41
@article{354198ce919c43b593891205e486288a, abstract = {We analyze a model for the Higgs sector with two scalar doublets and a Z(2) symmetry that is manifest in the Yukawa sector but broken in the potential. Thus, one of the doublets breaks the electroweak symmetry and has treelevel Yukawa couplings to fermions, whereas the other doublet has no vacuum expectation value and no treelevel couplings to fermions. Since the Z(2) parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This stealth doublet model can be seen as a generalization of the inert doublet model with a broken Z(2) symmetry. We outline the model and present constraints from theory, electroweak precision tests, and collider searches, including the recent observation of a Higgs boson at the LHC. The charged scalar H+/ and the CPodd scalar A couple to fermions at oneloop level. We compute the decays of Hperpendicular to and A and in particular the oneloop decays A > f (f) over bar, Hperpendicular to > f (f) over bar', H+/ > W+/ Z and H+/ > W+/gamma. We also describe how to calculate and renormalize such processes in our model. We find that if one of H+/ or A is the lightest scalar, H+/ > W+/gamma or A > b (b) over bar are typically their respective dominating decay channels. Otherwise, the dominating decays of H+/ and A are into a scalar and a vector. Due to the absence of treelevel fermion couplings for H+/ and A, we consider pair production and associated production with vector bosons and scalars at the LHC. If the parameter space of the model that favors H+/ > W+/gamma. is realized in Nature, we estimate that there could be a considerable amount of such events in the present LHC data.}, articleno = {095002}, author = {Enberg, Rikard and Rathsman, Johan and Wouda, Glenn}, issn = {15502368}, language = {eng}, number = {9}, publisher = {American Physical Society}, series = {Physical Review D (Particles, Fields, Gravitation and Cosmology)}, title = {Higgs phenomenology in the stealth doublet model}, url = {http://dx.doi.org/10.1103/PhysRevD.91.095002}, volume = {91}, year = {2015}, }