Bounds on vector leptoquarks
نویسندگان
چکیده
منابع مشابه
Bounds on vector leptoquarks.
We derive bounds on vector leptoquarks coupling to the first generation, using data from low energy experiments as well as from high energy accelerators. Similarly to the case of scalar leptoquarks, we find that the strongest indirect bounds arise from atomic parity violation and universality in leptonic π decays. These bounds are considerably stronger than the first direct bounds of HERA, rest...
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We derive new bounds on scalar leptoquark couplings from K − K̄, D − D̄ and B − B̄ mixing. Although leptoquarks contribute to these processes only at one loop, their contribution is large, due to the lack of GIM cancelation. Our bounds have two important features: (i) They bound g/M, in contrast to the hitherto known bounds on g/M, and are consequently stronger at high masses. (ii) The bound from ...
متن کاملBounds on Scalar Leptoquarks from the LEP Data
We obtain the constraints on scalar leptoquarks coming from radiative corrections to Z physics. We perform a global fitting to the LEP data including the contributions of the most general effective Lagrangian for scalar leptoquarks, which exhibits the SU(2)L×U(1)Y gauge invariance. Our bounds on leptoquarks that couple to the top quark are much stronger than the ones obtained from low energy ex...
متن کاملSignals for vector leptoquarks in hadronic collisions.
We analyze systematically the signatures of vector leptoquarks in hadronic collisions. We examine their single and pair productions, as well as their effects on the production of lepton pairs. Our results indicate that a machine like the CERN Large Hadron Collider (LHC) will be able to unravel the existence of vector leptoquarks with masses up to the range of 2–3 TeV. Submitted to Phys. Rev. D
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Some low-energy manifestations of a minimal extension of the Standard Model based on the quark-lepton SU (4) V ⊗ SU (2) L ⊗ G R symmetry of the Pati-Salam type are analysed. Given this symmetry a new type of mixing in the quark-lepton interactions is shown to be required. An additional arbitrariness of the mixing parameters could allow to decrease noticeably the lower bound on the leptoquark ma...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1994
ISSN: 0556-2821
DOI: 10.1103/physrevd.50.536