Associated Z(0)H(0) production with leptonic decays at the LHC in next-to-leading order QCD

作者：Zhang Shi-Ming^*; Zhang Ren-You; Ma Wen-Gan; Guo Lei

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, 86(3): 034018.

DOI：10.1103/PhysRevD.86.034018

• BROKEN SYMMETRIES
• SUPERSYMMETRY
• HIGGS
• BREAKING
• PHYSICS
• MODELS
• MASS

In this work we investigate the effects of the littlest Higgs model (LHM) up to the QCD next-to-leading order (NLO) on the Z(0)H(0) associated production at the CERN Large Hadron Collider (LHC). We study the dependences of the leading order and NLO QCD corrected integrated cross sections for this process on the factorization/renormalization scale and the LHM parameters. We also provide the distributions of the transverse momenta of final decay products mu(-) and tau(-). Our results show that the heavy neutral gauge bosons Z(H) and A(H) could induce significant discrepancies from the standard model predictions. It is found that when the LHM parameters are taken as c = 0.5, c' = 0.22, f = 4 TeV, and mu = (M-H + M-Z)/2, the effects at the root s = 14 TeV LHC from the heavy neutral gauge boson are about 12.83 and 10.37% to the leading order and NLO QCD corrected integrated cross sections, respectively. We also conclude that the NLO QCD corrections at the root s = 14 TeV LHC can obviously reduce the scale uncertainty of the integrated cross section, and significantly enhance the differential cross sections of p(T)(mu-) and p(T)(tau-). It demonstrates that the precision measurement of the Z(0)H(0) associated production process at the LHC could provide the clue of the LHM physics.

• 出版日期2012-8-20
• 单位中国科学技术大学