120323216
Elastic and inelastic scattering of 12 C + 12 C at E/A≥10 MeV and the deformation parameters
Elastic and inelastic scattering of /sup 12/C+ /sup 12/C, especially excitations of the ground-rotational-band members in /sup 12/C, have been studied at 139.5 and 158.8 MeV. Although reasonable fits to the angular distributions for the band members were obtained with a shallow optical potential, rainbowlike gross bumps observed at large angles in the elastic scattering were not explained at all by coupled-channel calculations for the rotational band. The present results of Vertical Bar..beta../sub 2/RVertical Bar and Vertical Bar..beta../sub 4/RVertical Bar obtained by the coupled-channel calculations are in good agreement with previously reported results, except some from /sup 12/C+ /sup 12/C scattering. These analyses indicate a significant difference in the deformation lengths derived depending upon the signs of the deformations. The sign of the deformation parameters is also discussed.
18630852
Enhancement of mu ---> e gamma in the supersymmetric SU(5) GUT at large tan Beta
Branching ratio of $\mu \to \e \gamma$ is evaluated in the supersymmetric SU(5) grand unified theory taking account of higher dimensional operators, which reproduce the realistic quark and lepton masses and the mixing parameters. It is shown by numerical calculation that at large $\tan\beta$ the branching ratio is enhanced by a few orders of magnitude since the flavor mixings for both the left- and the right-handed sleptons are induced by the effect of the higher dimensional operators.
119289848
H parity and the stable Higgs boson in the SO(5) X U(1) gauge-Higgs unification
In the SO(5) × U(1) gauge-Higgs unification model in the Randall-Sundrum warped space, there results the conservation of the H parity. The H parity is assigned to all 4D fields including excited modes in Kaluza-Klein towers. The neutral Higgs boson is the lightest particle of odd H parity, consequently becoming absolutely stable. Its mass is found to be 70-135 GeV for the warp factor z L = 10 5 -10 15 .
28171876
Patterns of flavor signals in supersymmetric models
Quark and lepton flavor signals are studied in four supersymmetric models, namely, the minimal supergravity model, the minimal supersymmetric standard model with right-handed neutrinos, SU(5) supersymmetric grand unified theory with right-handed neutrinos, and the minimal supersymmetric standard model with U(2) flavor symmetry. We calculate b{yields}s(d) transition observables in B{sub d} and B{sub s} decays, taking the constraint from the B{sub s}-B{sub s} mixing recently observed at the Tevatron into account. We also calculate lepton flavor violating processes {mu}{yields}e{gamma}, {tau}{yields}{mu}{gamma}, and {tau}{yields}e{gamma} for the models with right-handed neutrinos. We investigate possibilities to distinguish the flavor structure of the supersymmetry breaking sector with use of patterns of various flavor signals which are expected to be measured in experiments such as MEG, LHCb, and a future Super B factory.
122738154
RIGHT-HANDED COUPLINGS AND CP VIOLATION IN W BOSON DECAY
Parity and CP violation in W boson decay are discussed. It is shown that CP test is possible by measuring the angular distribution in a W boson non-suppressed two-body decay mode without the polarization measurement of the final state fermions. We found that LEP200 and next linear collider (NLC) have non-trivial sensitivity on the right-handed coupling and CP violation. LEP200 will slightly improve the present limit on the right-handed coupling in the coupling, and have sensitivity on the relative magnitude of the CP violation to the P violation up to 8×10−2. NLC will improve the former by some factor or even an order of magnitude, and have sensitivity on the latter up to 10−3–10−2.
126093035
$b \to s$ lepton anti-lepton in the minimal supergravity model
117860091
A review of recent E802 results
Some recent results are presented from AGS E802, a survey experiment which is studying reactions of 14.6 A {center dot} GeV beams of protons, {sup 16}O and {sup 28}Si on targets ranging from {sup 9}Be to {sup 197}Au. Spectra for the global forward and transverse energy are shown; in nucleus-nucleus collisions these two quantities are anticorrelated, consistent with a large amount of stopping. Slope parameters from inclusive particle spectra are presented, with the most interesting effect being an apparent heating'' of mid-rapidity protons which emerge from the collisions of the largest nuclei. Also given are preliminary data on the production of antiprotons. 8 refs., 4 figs., 1 tab.