#### Filter Results:

- Full text PDF available (17)

#### Publication Year

1994

2017

#### Publication Type

#### Co-author

#### Publication Venue

Learn More

- P Ball, R Fleischer, +67 authors N Zaitsev
- 2000

We review the prospects for B-decay physics at the LHC as discussed in the 1999 workshop on Standard Model physics at the LHC.

We justify the feasibility of substituting a photon leg by a neutrino current in the Euler–Heisenberg Lagrangian to obtain an effective Lagrangian for the process γν → γγν and its crossed reactions. We establish the link between these processes and the four-photon scattering in both the Standard Model and the effective theory. As an application, we compute… (More)

In a wide class of new-physics models, which can be motivated through generic arguments and within supersymmetry, we obtain large contributions to B 0 d –B 0 d mixing, but not to ∆B = 1 processes. If we assume such a scenario, the solutions φ d ∼ 47 • ∨ 133 • for the B 0 d –B 0 d mixing phase implied by A mix CP (B d → J/ψK S) cannot be converted directly… (More)

- Javier Martínez, Carla Iglesias, J. M. Matías, José Taboada, María Araújo
- Applied Mathematics and Computation
- 2014

We perform an exhaustive analysis of the Equivalence Theorem both in the minimal Standard Model and in an Effective Electroweak Chiral Lagrangian up to O(p 4). We have considered the leading corrections to the usual prescription consisting in just replacing longitudinally polarized W or Z by the corresponding Goldstone bosons. The corrections appear through… (More)

- Andrea Donini, Ferruccio Feruglio, Joaquim Matias, Fabio Zwirner
- 1997

We consider an extension of the standard electroweak theory with gauge group SU (2) L × SU (2) R × U (1) ˜ Y , where the gauge bosons of the extra SU (2) R factor do not couple to ordinary fermions. We show that precision electroweak data and flavour physics provide quite stringent indirect constraints on its parameter space, but still allow for relatively… (More)

- Joaquim Matias
- 2008

We provide a set of sum rules relating CP-averaged branching ratios and CP-asymmetries of the B → πK modes. They prove to be useful as a mechanism to 'test' experimental data given our expectations of the size of isospin breaking. A set of observables emerges providing a simpler interpretation of data in terms of isospin breaking. Moreover, the derivation… (More)

We analyze the matching conditions to determine the values that the O(p 4) coefficients of an Effective Chiral Lagrangian take in the Standard Model in the limit of a large Higgs mass, pointing out a number of subtleties that appear to have gone unnoticed previously. We apply the resulting Effective Chiral Lagrangian, including the leading two loop effects,… (More)

In this paper, we compute the Standard Model polarized amplitudes and cross sections of the processes γν → γγν, γγ → γν ¯ ν and ν ¯ ν → γγγ, for centre-of-mass energies ω within the range of validity of the Fermi theory. By using a large electron-mass expansion of the exact result, we also derive the first correction term to the effective, low-energy (ω < m… (More)