TY - JOUR
T1 - Probing CP violation in h →zγ with background interference
AU - Farina, Marco
AU - Grossman, Yuval
AU - Robinson, Dean J.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/10/7
Y1 - 2015/10/7
N2 - We show that the parity of the hZγ vertex can be probed by interference between the gluon fusion Higgs production, gg→h→γZ→γ+-, and the background, gg→γZ→γ+-, amplitudes. In the presence of a parity violating hZγ vertex, this interference alters the kinematic distribution of the leptons and photon compared to Standard Model (SM) expectations. For a Higgs with SM-sized width and couplings, we find that the size of the effect enters at most at the 10-2 level. Such a small effect cannot be seen at the LHC, even with futuristic high luminosities. Should there exist other broader scalar particles with larger production cross-section times branching ratio to Zγ, then the parity structure of their Zγ couplings can be probed with this technique.
AB - We show that the parity of the hZγ vertex can be probed by interference between the gluon fusion Higgs production, gg→h→γZ→γ+-, and the background, gg→γZ→γ+-, amplitudes. In the presence of a parity violating hZγ vertex, this interference alters the kinematic distribution of the leptons and photon compared to Standard Model (SM) expectations. For a Higgs with SM-sized width and couplings, we find that the size of the effect enters at most at the 10-2 level. Such a small effect cannot be seen at the LHC, even with futuristic high luminosities. Should there exist other broader scalar particles with larger production cross-section times branching ratio to Zγ, then the parity structure of their Zγ couplings can be probed with this technique.
UR - http://www.scopus.com/inward/record.url?scp=84945289302&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.92.073007
DO - 10.1103/PhysRevD.92.073007
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AN - SCOPUS:84945289302
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 7
M1 - 073007
ER -