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66 results on '"Branchina, V."'

56. Renormalization of massless λΦ theories: Asymptotic freedom and spontaneous symmetry breaking.

Author

Branchina, V., Consoli, M., and Stivala, N.

Abstract

The implications of both one loop and gaussian approximation to the effective potential of massless λΦ theories are analyzed. By assuming only the unavoidable existence of a regularization scheme which preserves the variational inequality, it is possible to obtain an estimate of the weak coupling ß-function with is remarkably consistent with the Coleman-Weinberg one loop calculation. Both indicate that massless λΦ theories are asymptotically free, not in contradiction with any known rigorous result. The consequences of our analysis for the Standard Model of electroweak interactions are briefly illustrated. [ABSTRACT FROM AUTHOR]

Published
1993
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58. Renormalization of masslessλΦ4 theories: Asymptotic freedom and spontaneous symmetry breaking

Author

Branchina, V., Consoli, M., and Stivala, N. M.

Abstract

The implications of both one loop and gaussian approximation to the effective potential of masslessλΦ4 theories are analyzed. By assuming only the unavoidable existence of a regularization scheme which preserves the variational inequality, it is possible to obtain an estimate of the weak coupling ß-function with is remarkably consistent with the Coleman-Weinberg one loop calculation. Both indicate that masslessλΦ4 theories are asymptotically free, not in contradiction with any known rigorous result. The consequences of our analysis for the Standard Model of electroweak interactions are briefly illustrated.

Published
1993
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59. NUMEN project : Challenges in the investigation of double charge-exchange nuclear reactions, towards neutrino-less double beta decay

Author

Agodi, C., Cappuzzello, F., Balestra, F., Bijker, R., Bonanno, D., Bongiovanni, D., Branchina, V., Calabretta, L., Calanna, A., Calvo, D., Carbone, D., Cavallaro, M., Colonna, M., Deshmukh, N., Sergio Ferrero, Foti, A., Finocchiaro, P., Giraudo, G., Greco, V., Iazzi, F., Introzzi, R., Lavagno, A., Lo Presti, D., Longhitano, F., Muoio, A., Pandola, L., Rifuggiato, D., Ruslan, M. V., Santagati, G., Santopinto, E., Scaltrito, L., Tudisco, S., Zagatto, V., Gomes, P. R., Linares, R., Lubian, J., Medina, N. H., Oliveira, J. R. B., Rodrigues, M. R. D., Borello-Lewin, T., Mendes, D. R., Faria, P. N., Aslanoglou, X., Pakou, A., Sgouros, O., and Soukeras, V.

60. Challenges in double charge exchange measurements for neutrino physics

Author

Torresi, D., Agodi, C., Bellone, J., Bonanno, D., Branchina, V., Brasolin, S., Brischetto, G., Brunasso, O., Stefano Burrello, Calabrese, S., Calabretta, L., Calvo, D., Capirossi, V., Cappuzzello, F., Carbone, D., Cavallaro, M., Ciraldo, I., Colonna, M., D’agostino, G., Delaunay, F., Deshmukh, N., Ferretti, J., Finocchiaro, P., Fisichella, M., Foti, A., Gallo, G., Garcia-Tecocoatzi, H., Hacisalihoglu, A., Iazzi, F., Lanzalone, G., La Via, F., Lay, J. A., Longhitano, F., Lo Presti, D., Mereu, P., Pandola, L., Pinna, F., Reito, S., Rifugiato, D., Russo, A. D., Russo, G., Santopinto, E., Sgouros, O., Soukeras, V., Spatafora, A., Tudisco, S., Vsevolodovna, R. I. M., Borello-Lewin, T., Faria, P. N., Ferreira, J. L., Linares, R., Lubian, J., Medina, N., Mendes, D. R., Moralles, M., Oliveira, J. R. B., Rodrigues, M. R. D., Santos, R. B. B., Da Silveira, M. A. G., Zagatto, V. A. B., Pakou, A., Souliotis, G., Acosta, L., Amador, P., Bijker, R., Belmont, D., Chávez Lomelí, E. R., Espejel, R., Flores, A., Ggongora, B., Huerta, A., Marin-Lambarri, D., Martínez, S., C Ordoñez, J. M., Reza, G., Sandoval, S., Vargas, H., Vega, G., Lenske, H., Boztosun, I., Djapo, H., Firat, S., Hazar, S., Kucuk, Y., Solakci, S. O., Yildirin, A., Auerbach, N., Petrascu, H., Kotila, J., Geronimo, G., Pietralla, N., Ries, P., Werner, V., Barea, J., Chen, R., Ma, J., Wang, J. S., and Yang, Y. Y.

62. Stability, Higgs boson mass, and new physics.

Author

Branchina V and Messina E

Abstract

Assuming that the particle with mass ∼126  GeV discovered at LHC is the standard model Higgs boson, we find that the stability of the electroweak (EW) vacuum strongly depends on new physics interaction at the Planck scale MP, despite of the fact that they are higher-dimensional interactions, apparently suppressed by inverse powers of MP. In particular, for the present experimental values of the top and Higgs boson masses, if τ is the lifetime of the EW vacuum, new physics can turn τ from τ≫TU to τ≪TU, where TU is the age of the Universe, thus, weakening the conclusions of the so called metastability scenario.

Published
2013
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63. Mapping fermion and boson systems onto the Fock space of harmonic oscillators.

Author

Branchina V, Di Liberto M, and Lodato I

Abstract

The fluctuation-dissipation theorem (FDT) is very general and applies to a broad variety of different physical phenomena in condensed matter physics. With the help of the FDT and following the famous work of Caldeira and Leggett, we show that, whenever linear response theory applies, any generic bosonic or fermionic system at finite temperature T can be mapped onto a fictitious system of free-harmonic oscillators. To the best of our knowledge, this is the first time that such a mapping is explicitly worked out. This finding provides further theoretical support to the phenomenological harmonic oscillator models commonly used in condensed matter. Moreover, our result helps in clarifying an interpretation issue related to the presence and physical origin of the Bose-Einstein factor in the FDT.

Published
2010
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