16779631
Electric dipole moments as signals of supersymmetric unification
Abstract If supersymmetric unification is true, we show how the combined effort of several experiments under way to try to measure an electric dipole moment of the electron or of the neutron has a significant chance not only of producing a positive signal but also of providing crucial information to understand the physical origin of the signal itself.
16036753
Strings versus supersymmetric GUTs: can they be reconciled?
Abstract We describe a class of supersymmetric unified models with the following properties: i) the full breaking of the gauge group is achieved by Higgs fields in the fundamental representation; ii) the correct unification of the strong and electroweak coupling constants is obtained without the need of any intermediate scale; iii) the problems of the doublet-triplet splitting and of the proton decay at dimension-5 level may receive a natural solution. The models, other than being interesting unified field theories per se , may constitute examples of string-derivable GUTs.
18210310
Alternative theories of CP violation
Abstract Recent improvements to the limit of ΔM B s imply that pure superweak theories, while not excluded, no longer provide a good fit to the data. A class of general superweak theories is introduced in which all flavor changing interactions are governed by an approximate flavor symmetry which gives a “3 mechanism”. These theories are in good agreement with data, and predict low values for | V td |, | V ub / V cb |, B(K + →π + ν ν) , ϵ ′/ ϵ and CP asymmetries in B decays, and high values for ΔM B s and f B B B . An important example of such a theory is provided by weak scale supersymmetric theories with soft CP violation. The CP violation originates in the squark mass matrix, and, with phases of order unity, flavor symmetries can yield a correct prediction for the order of magnitude of ϵ K .
122546935
Supersymmetry, R-parity breaking and the neutrino magnetic moment
Abstract We show that supersymmetric theories with R -parity breaking naturally give rise to significant neutrino magnetic moments. In the minimal supersymmetric standard model the transition magnetic moment μ ν e ν μ can be as large as 10 −13 μ B ( μ B is the Bohr magneton). By requiring an SU (2) H horizontal symmetry of the lagrangian in the Yukawa-less limit, μ ν e ν μ may be one order magnitude larger. In this case the main naturalness constraint on the maximum μ ν e ν μ attainable is the electron mass value rather than the bound on the neutrino mass itself.
27801366
Grand unification and the supersymmetric threshold.
It is shown that grand unification of the minimal supersymmetric standard model does not lead to a prediction for the scale of the superpartner masses, even if the inputs {alpha}, sin{sup 2}{theta}, and {alpha}{sub {ital s}} are known exactly.
2583944
The high-2 HERA anomaly and supersymmetric unification
Abstract We discuss an initial condition on the superpotential couplings of an SU(5) theory which allows the R -violating term Ld c Q but avoids the simultaneous presence of LLe c + d c d c u c . This same condition keeps under control the products of pairs of different coupling λ ijk L i d j c Q k , which are more strongly constrained by flavour-changing-neutral-current limits. In our view, this observation makes relatively more plausible the interpretation of the high- Q 2 HERA anomaly, if real, as caused by squark production.
218730825
Measurement of pseudorapidity distributions of charged particles in proton–proton collisions at √s = 8 TeV by the CMS and TOTEM experiments
208865876
Measurements of jet multiplicity and differential production cross sections of Z + jets events in proton-proton collisions at √s = 7 TeV
Measurements of differential cross sections are presented for the production of a Z boson and at least one hadronic jet in proton-proton collisions at √s=7  TeV, recorded by the CMS detector, using a data sample corresponding to an integrated luminosity of 4.9  fb^(−1). The jet multiplicity distribution is measured for up to six jets. The differential cross sections are measured as a function of jet transverse momentum and pseudorapidity for the four highest transverse momentum jets. The distribution of the scalar sum of jet transverse momenta is also measured as a function of the jet multiplicity. The measurements are compared with theoretical predictions at leading and next-to-leading order in perturbative QCD.