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Family gauge boson production at the LHC
Koide, Y.,Yamanaka, M.,Yokoya, H. North-Holland Pub. Co 2015 Physics letters. Section B Vol.750 No.-
Family gauge boson production at the LHC is investigated according to a U(3) family gauge model with twisted family number assignment. In the model we study, a family gauge boson with the lowest mass, A<SUB>1</SUB><SUP>1</SUP>, interacts only with the first generation leptons and the third generation quarks. (The family numbers are assigned, for example, as (e<SUB>1</SUB>,e<SUB>2</SUB>,e<SUB>3</SUB>)=(e<SUP>-</SUP>,μ<SUP>-</SUP>,τ<SUP>-</SUP>) and (d<SUB>1</SUB>,d<SUB>2</SUB>,d<SUB>3</SUB>)=(b,d,s) [or (d<SUB>1</SUB>,d<SUB>2</SUB>,d<SUB>3</SUB>)=(b,s,d)].) In the model, the family gauge coupling constant is fixed by relating to the electroweak gauge coupling constant. Thus measurements of production cross sections and branching ratios of A<SUB>1</SUB><SUP>1</SUP> clearly confirm or rule out the model. We calculate the cross sections of inclusive A<SUB>1</SUB><SUP>1</SUP> production and bb@?(tt@?) associated A<SUB>1</SUB><SUP>1</SUP> production at s=14 TeV and 100 TeV. With the dielectron production cross section, we discuss the determination of diagonalizing matrix of quark mass matrix, U<SUB>u</SUB> and U<SUB>d</SUB>, respectively.