32 research outputs found
Status of (3686), (4040), (4160), Y (4260), (4415) and X (4630) charmonia like states
We examine the status of charmonia like states by looking into the behaviour
of the energy level differences and regularity in the behaviour of the leptonic
decay widths of the excited charmonia states. The spectroscopic states are
studied using a phenomenological Martin-like confinement potential and their
radial wave functions are employed to compute the di-leptonic decay widths.
Their deviations from the expected behaviour provide a clue to consider them as
admixtures of the nearby S and D states. The present analysis strongly favour
\\backslash$psi \$ (3686) as admixture of $c \bar{c}$ (2S) and $c \bar{c}$g
(4.1 GeV) hybrid, \\backslash\backslash\backslash^\circ^\circc \bar{c}c \bar{c}\backslash$psi \$ (4415) is still not clear as it does not fit to be pure or
admixture state
Isolation of bioluminescent bacteria from marine organisms
471-476Bioluminescence is an emission of cold light by enzyme driven reaction within certain living organisms. The most abundant and widely distributed light emitting organisms are luminescent bacteria. Such organisms are either found as free-living in the ocean or in symbiotic relationship with the marine host. To employ bioluminescence in environmental monitoring, isolation of bioluminescent bacteria from the two different marine samples (sea water sample and various organs of squid and fish) were collected from different sites of Veraval seashore and fish markets located nearby seashore respectively. The marine organisms used in the study were 20-25 days old. Cultivation media that were used for isolation were sea water agar (SWA), luminous agar (LA) and nutrient agar (NA); out of which SWA proved to be the most suitable medium for their growth and luminescence. No bioluminescent bacterium was found in water samples and total five bioluminescent bacteria were isolated from five different organs of fish and squid each. Out of these five isolates, two were selected based on their maximum light intensity. These two isolates, PBS1 and PBF1, were further characterized biochemically. PBS1 was able to utilize glucose, galactose, maltose and were tested positive for catalase and oxidase tests. Similar results were obtained in case of PBF1 except it was tested positive for urease urea but was unable to utilize glucose. Both isolates thrived at neutral pH and showed maximum bioluminescence. Effect of NaCl concentration on luminescence revealed that the two isolates were not able to grow in media devoid of NaCl and the luminescence was found to be maximum at 3 % (w/v) NaCl supplementation
Two-Photon, Two-gluon and Radiative Decays of Heavy Flavoured Mesons
Here we present the two-photon and two-gluon decay widths of the S-wave
() and P-wave () charmonium and bottonium
states and the radiative transition decay widths of , and
systems based on Coulomb plus power form of the inter-quark potential
() with exponent . The Schrdinger equation is solved
numerically for different choices of the exponent . We employ the masses
of different states and their radial wave functions obtained from the study to
compute the two-photon and two-gluon decay widths and the E1 and M1 radiative
transitions. It is found that the quarkonia mass spectra and the E1 transition
can be described by the same interquark model potential of the with
for and for systems, while the M1
transition (at which the spin of the system changes) and the decay rates in the
annihilation channel of quarkonia are better estimated by a shallow potential
with .Comment: 27 Pages, 8 figure