1,648 research outputs found
The production of a non-homogeneous classical pion field and the distribution of the neutral and charged pions
The probability distribution as a function of the ratio
of the neutral to total multiplicities is calculated for the
classical pion fields quickly varying in space and time.Comment: 6 pages, 1 .eps figure, using epsfig, submitted to Phys.Let
Multiphonon anharmonic decay of a quantum mode
A nonperturbative theory of multiphonon anharmonic transitions between energy
levels of a local mode is presented. It is shown that the rate of transitions
rearranges near the critical level number : at smaller the process
slows down, while at larger it accelerates in time, causing a jump-like
loss of energy followed by the generation of phonon bursts. Depending on
parameters, phonons are emitted in pairs, triplets etc.Comment: submitted to Europhys.Let
Fermionic Bound States and Pseudoscalar Exchange
We discuss the possibility that fermions bind due to Higgs or pseudoscalar
exchange. It is reasonable to believe on qualitative grounds that this can
occur for fermions with a mass larger than 800-900 GeV. An exchange of a
pseudoscalar boson leads in the non-relativistic limit to an unacceptable
potential which behaves like 1/r^3 at the origin. We show that this singular
behaviour is smeared out when relativistic effects are included
Non perturbative Adler-Bardeen Theorem
The Adler-Bardeen theorem has been proved only as a statement valid at all
orders in perturbation theory, without any control on the convergence of the
series. In this paper we prove a nonperturbative version of the Adler-Bardeen
theorem in by using recently developed technical tools in the theory of
Grassmann integration.Comment: 28 pages, 14 figure
The investigation of succinic and malic dehydrogenases in serum.
Thesis (M.A.)--Boston UniversityThe aim of the experiment is to search for malic and succinic dehydrogenases in normal plasma or serum. The role which these two enzymes play in cellular metabolism, the unique way in which plasma reflects many cellular metabolic changes, the discovery of so many cellular enzymes in plasma, and the vagueness of knowledge about the relation of cellular enzymes to plasma proteins in general, seem to justify the search. [TRUNCATED
Multi-lepton Signatures of a Hidden Sector in Rare B Decays
We explore the sensitivity of flavour changing b -> s transitions to a
(sub-)GeV hidden sector with generic couplings to the Standard Model through
the Higgs, vector and axion portals. The underlying two-body decays of B
mesons, B -> X_s S and B0 -> SS, where S denotes a generic new GeV-scale
particle, may significantly enhance the yield of monochromatic lepton pairs in
the final state via prompt decays of S to a dilepton pair. Existing
measurements of the charged lepton spectrum in neutral-current semileptonic B
decays provide bounds on the parameters of the light sector that are
significantly more stringent than the requirements of naturalness. New search
modes, such as B -> X_s + n(l+l-) and B0 -> n(l+l-) with n > 1 can provide
additional sensitivity to scenarios in which both the Higgs and vector portals
are active, and are accessible to (super-)B factories and hadron colliders.Comment: 12 pages, 2 figures; v2: reference added, minor correction
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