Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-03-17
Phys.Rev. D56 (1997) 5709-5724
Physics
High Energy Physics
High Energy Physics - Phenomenology
Corrected single production cross section at Tevatron, updated atomic parity violation constraints, 55 pages
Scientific paper
10.1103/PhysRevD.56.5709
We examine the phenomenological implications of a 200 GeV leptoquark in light of the recent excess of events at HERA. Given the relative predictions of events rates in e^+p versus e^-p, we demonstrate that classes of leptoquarks may be excluded, including those contained in E_6 GUT models. It is shown that future studies with polarized beams at HERA could reveal the chirality of the leptoquark fermionic coupling and that given sufficient luminosity in each e^\pm_{L,R} channel the leptoquark quantum numbers could be determined. The implications of 200-220 GeV leptoquarks at the Tevatron are examined. While present Tevatron data most likely excludes vector leptoquarks and leptogluons in this mass region, it does allow for scalar leptoquarks. We find that while leptoquarks have little influence on Drell-Yan production, further studies at the Main Injector are possible in the single production channel. We investigate precision electroweak measurements as well as the process e^+e^-\to q\bar q at LEP II and find they provide no further restrictions on these leptoquark models. We then ascertain that cross section and polarization asymmetry measurements at the NLC provide the only direct mechanism to determine the leptoquark's electroweak quantum numbers. The single production of leptoquarks in \gamma e collisions by both the backscattered laser and Weisacker-Williams techniques at the NLC is also discussed. Finally, we demonstrate that we can obtain successful coupling constant unification in models with leptoquarks, both with or without supersymmetry. The supersymmetric case requires the GUT group to be larger than SU(5) such as flipped SU(5)\times U(1)_X.
Hewett JoAnne L.
Rizzo Thomas G.
No associations
LandOfFree
Much Ado About Leptoquarks: A Comprehensive Analysis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Much Ado About Leptoquarks: A Comprehensive Analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Much Ado About Leptoquarks: A Comprehensive Analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-196134