Abstract: We study angular observables in the (Formula presented.) channel at future circular e+e− colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy (Formula presented.) GeV and 5 (30) ab−1 integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for he Higgs-strahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of both probing BSM corrections to the HZγ coupling and constraining the “blind spot” in indirect limits on supersymmetric scalar top partners.
Bibliographical noteFunding Information:
We thank Gang Li and Xin Mo for providing us the CEPC pre-CDR simulation events. We thank Nima Arkani-Hamed, Marco Farina, Marat Freytsis, Matthew McCullough, Maxim Perelstein, Matt Reece, and Lian-Tao Wang for useful conversations. KW and JG also thank Cai-Dian L? for assistance. NC is supported by the Department of Energy under the grant DE-SC0014129. NC and ZL acknowledge the hospitality of the IHEP Center for Future High Energy Physics where this work was initiated. Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02- 07CH11359 with the United States Department of Energy. KW and JG are supported in part by the CAS Center for Excellence in Particle Physics (CCEPP). JG is also supported in part by the Chinese Academy of Science (CAS) International Traveling Award under Grant H95120N1U7.
© 2016, The Author(s).
- Beyond Standard Model
- Effective field theories
- Higgs Physics