Beta functions and anomalous dimensions up to three loops

We derive an algorithm for automatic calculation of perturbative $\beta$-functions and anomalous dimensions in any local quantum field theory with canonical kinetic terms. The infrared rearrangement is performed by introducing a common mass parameter in all the propagator denominators. We provide a set of explicit formulae for all the necessary scalar integrals up to three loops.Comment: 22 pages, 4 figures, uses epsf.st

Light Hybrid Mesons in QCD

Including the radiative perturbative corrections and the short distance tachyonic gluon mass effects which mimic the ones of UV renormalons, we re-estimate the decay amplitudes, masses and widths of light hybrid mesons from QCD spectral sum rules. We show that the effects are tiny and confirm the previous lowest order results. We discuss the phenomenological impacts of our results for the vector hybrids.Comment: Typos fixed, references updated; the final version version to appear in Phys. Lett. B. 6 pages, Latex, espcrc1.sty is required (included). The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints

|Delta F| = 1 Nonleptonic Effective Hamiltonian in a Simpler Scheme

We consider |\Delta F| = 1 (F = S,C or B) nonleptonic effective hamiltonian in a renormalization scheme which allows to consistently use fully anticommuting gamma_5 at any number of loops, but at the leading order in the Fermi coupling G_F. We calculate two-loop anomalous dimensions and one-loop matching conditions for the effective operators in this scheme. Finally, we transform our results to one of the previously used renormalization schemes, and find agreement with the original calculations.Comment: 21 pages, 7 figures, uses epsf.st

Weak Radiative B-Meson Decay Beyond Leading Logarithms

We present our results for three-loop anomalous dimensions necessary in analyzing $B{\to}X_s\gamma$ decay at the next-to-leading order in QCD. We combine them with other recently calculated contributions, obtaining a practically complete next-to-leading order prediction for the branching ratio ${\cal B}(B{\to}X_s\gamma) = (3.28 \pm 0.33) \times 10^{-4}$. The uncertainty is more than twice smaller than in the previously available leading order theoretical result. The Standard Model prediction remains in agreement with the CLEO measurement at the $2 \sigma$ level.Comment: Formulae for f_88(delta), f_78(delta), f_12(delta) and the first equation in Appendix B correcte

Isolation and Screening of Glutaminase & Urease Free Novel Fungal Strains for the Production of L-Asparaginase

L - Asparaginase is an amidohydrolase that catalyzes the hydrolysis of amino acid L - aspar a gine in to aspartic acid and ammonia. It is used in the treatment of Acute L ymphoblastic Leukemia (ALL ) and some other malignant lymphoid abnormalities . It is also used in food industry to prevent the formation of a crylamide , a carcinogenic substance in carbohydrate rich fried and baked foods. Naturally L - Asparaginase is present i n plants, animals and microbes but microorganisms such as bacteria, yeast and fungi are generally used for the production of L - Asparaginase as it is difficult to obtain the same from plants and animals. It is found that the L - Asparaginase from bacteria causes side effects in humans including anaphylaxis and serious allergic reactions which can be fatal in some cases . To overcome this, eukaryotic organisms such as fungi can be used for the production of L - Asparaginase . Bu t sometimes the fungi produces L - glutaminase and urease enzymes along with L - Asparaginase which is difficult to remove in the purification stage. In order to prevent this fungal strains which can produce L - Asparaginase fre e of L - glutaminase and urease are isolated from different sources using standard protocols