Precise measurement on effective gluon Yukawa coupling via jet energy profile In collaboration with Gexing Li, Zhao Li, Yandong Liu, Xiaoran Zhao Yan Wang Institute of High Energy Physics 2016-12-15

A Busy Hadronic Environment LHC Underlying event, the remnants of the scattering protons Multiple interactions, additional collisions of partons arising from the same p-p collision as the hard interaction Pile-up, additional p-p collisions from other protons in the colliding bunches Z, W, T and H are produced with enough of a boost. The simple picturethat one parton corresponds to one jet breaks down badly.

Jet shape A function f( 𝑝 𝑗 ) without the explicit use of jet algorithm Affected by unassociated radiation (pileup) Need to be infrared-safe and collinear-safe, If f( 𝑝 𝑗 ) is linear, automatically safe. Sensitive to color charge, initial gluons will radiate more with a large angles than initial quarks ( 𝐶 𝐹 < 𝐶 𝐴 )

Jet shape Probing the characteristic shower structure of QCD Jet mass. Jet broadening: the momentum –weighted transverse spread of the particle. 𝐵 𝐻 = 1 ∑| 𝑝 𝑖 | ∑ 𝑝 𝑖 × 𝑛 Differential 𝜌(𝑟) and integrated jet shape 𝜓(𝑟): the radial distribution of radiation inside a jet. Ψ 𝑟 = 1 𝑁 𝐽 𝑖 𝑝 𝑇 0< 𝑟 𝑖 <𝑟 𝑝 𝑇,𝐽 𝜌 𝑟 = 1 𝛿r 1 𝑁 𝐽 𝑖 𝑝 𝑇 0< 𝑟 𝑖 <𝑟+𝛿r 𝑝 𝑇,𝐽 Girth: the linear radial moment of the jet 𝑔 𝐽 = 𝑖 𝑝 𝑇,𝑖 𝑟 𝑖 𝑝 𝑇,𝐽 Angularities 𝜏 𝑎 = 1 2 𝐸 𝐽 ∑ 𝑝 𝑇,𝑖 𝑒 (𝑎−1 )𝜂 𝑖

Energy Profile at LHC Gluon fusion ψ 𝑟 = 1 𝑁 𝐽 𝑟 ′ <𝑟 𝑝 𝑇 𝑟′ 𝑟 ′ <𝑅 𝑝 𝑇 𝑟′ 𝑝 𝑝→𝐻+𝑗+𝑗 VBF gluon initiated jets radiate more, produce a slowly raising JEP quark initiated jets radiate less, produce a quickly raising JEP. so JEP has been applied to identify higgs production mechanism. and applied in searching DM. The OPAL Collaboration, R. Akers et al., Z. Phys. C 63 197 (1994) The ATLAS Collaboration, Phys.Rev.D83:052003,(2011) C. Rentala, N. Vignaroli, H.N. Li, Z. Li, and C. P. Yuan, PRD88, 073007 (2013) P. Agrawal and V. Rentala, JHEP05, 098 (2014) R. S. Chivukula, E. H. Simmons, and N. Vignaroli, Arxiv:1507.06522

JEP on CEPC measure higgs coupling 𝑒 + 𝑒 − →𝑍ℎ→ 𝑙 + 𝑙 − 𝑏𝑏 , 𝑒 + 𝑒 − →𝑍ℎ→ 𝑙 + 𝑙 − 𝑔𝑔, 𝑒 + 𝑒 − →𝑍ℎ→𝑏𝑏𝑏𝑏, 𝑒 + 𝑒 − →𝑍ℎ→𝑗𝑗𝑏𝑏, 𝑒 + 𝑒 − →𝑍ℎ→𝑏𝑏𝑔𝑔, 𝑒 + 𝑒 − →𝑍ℎ→𝑗𝑗𝑔𝑔, 𝑒 + 𝑒 − →𝑍ℎ→𝜈𝜈𝑏𝑏, 𝑒 + 𝑒 − →𝑍ℎ→𝜈𝜈𝑔𝑔, huge higgs production rate clear background dijet final state 𝑘 𝑔 ℎ 𝐺 𝜇𝜈 𝑎 𝐺 𝑎𝜇𝜈

observable First, normal cut for dijet final state from higgs decay (mass window and recoil mass cut and …) Then, jet substructure: define 𝜓(𝑟) 𝑝 𝑇 𝑖 = 𝜓 𝑟 𝑗1 𝑝 𝑇 𝑖 + 𝜓 𝑟 𝑗2 𝑝 𝑇 𝑖 2 The average value of JEP The observable

Relation between 𝜅 𝑔 and Λ 𝑁 (𝑟)

b&c tagging veto Pt 30 Delphes 0 2e2b 4b 2

JEP on LEP

How about the background? We are working for that…. But..

Another observable

Conclusion Using JEP to study effective gluon Yukawa coupling . New Observables : Λ 𝑁 𝑟 , 𝑋 𝑁 (𝑟)

Thanks