TY - JOUR
T1 - Testing naturalness at 100 TeV
AU - Chen, Chuan Ren
AU - Hajer, Jan
AU - Liu, Tao
AU - Low, Ian
AU - Zhang, Hao
N1 - Funding Information:
J. Hajer and T. Liu would like to thank J. Bernon, Y.-Y. Li and J. Shu for helpful discussions, while I. Low acknowledges the hospitality at Hong Kong University of Science and Technology, where part of this work was performed. J. Hajer and T. Liu are supported by the Collaborative Research Fund (CRF) under Grant № HUKST4/CRF/13G. T. Liu is also supported by the General Research Fund (GRF) under Grant № 16312716. Both the CRF and GRF grants are issued by the Research Grants Council of Hong Kong S.A.R.. H. Zhang was supported by the U.S. DOE under Contract № DE-SC0011702, as well as by IHEP under Contract № Y6515580U1 and IHEP Innovation Grant contract № Y4545171Y2. I. Low was supported in part by the U.S. Department of Energy under contracts № DE-AC02-06CH11357 and № DE-SC 0010143. C.-R. Chen was supported in part by the Ministry of Science and Technology of Taiwan under Grant № MOST-105-2112-M-003-010-MY3.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - Solutions to the electroweak hierarchy problem typically introduce a new symmetry to stabilize the quadratic ultraviolet sensitivity in the self-energy of the Higgs boson. The new symmetry is either broken softly or collectively, as for example in supersymmetric and little Higgs theories. At low energies such theories contain naturalness partners of the Standard Model fields which are responsible for canceling the quadratic divergence in the squared Higgs mass. Post the discovery of any partner-like particles, we propose to test the aforementioned cancellation by measuring relevant Higgs couplings. Using the fermionic top partners in little Higgs theories as an illustration, we construct a simplified model for naturalness and initiate a study on testing naturalness. After electroweak symmetry breaking, naturalness in the top sector requires aT = − λt 2 at leading order, where λt and aT are the Higgs couplings to a pair of top quarks and top partners, respectively. Using a multivariate method of Boosted Decision Tree to tag boosted particles in the Standard Model, we show that, with a luminosity of 30 ab−1 at a 100 TeV pp-collider, naturalness could be tested with a precision of 10% for a top partner mass up to 2.5 TeV.
AB - Solutions to the electroweak hierarchy problem typically introduce a new symmetry to stabilize the quadratic ultraviolet sensitivity in the self-energy of the Higgs boson. The new symmetry is either broken softly or collectively, as for example in supersymmetric and little Higgs theories. At low energies such theories contain naturalness partners of the Standard Model fields which are responsible for canceling the quadratic divergence in the squared Higgs mass. Post the discovery of any partner-like particles, we propose to test the aforementioned cancellation by measuring relevant Higgs couplings. Using the fermionic top partners in little Higgs theories as an illustration, we construct a simplified model for naturalness and initiate a study on testing naturalness. After electroweak symmetry breaking, naturalness in the top sector requires aT = − λt 2 at leading order, where λt and aT are the Higgs couplings to a pair of top quarks and top partners, respectively. Using a multivariate method of Boosted Decision Tree to tag boosted particles in the Standard Model, we show that, with a luminosity of 30 ab−1 at a 100 TeV pp-collider, naturalness could be tested with a precision of 10% for a top partner mass up to 2.5 TeV.
KW - Beyond Standard Model
KW - Higgs Physics
KW - Technicolor and Composite Models
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U2 - 10.1007/JHEP09(2017)129
DO - 10.1007/JHEP09(2017)129
M3 - Article
AN - SCOPUS:85030095512
VL - 2017
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 9
M1 - 129
ER -