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19922026
Showing 2007 · hep-phShow all

22 papers · 2 filters

hep-ph2007★ 64 cited

Photon induced Lambda(1520) production and the role of the K^* exchange

Hiroshi Toki, Carmen Garcia-Recio, Juan Nieves

We study the photon induced Lambda(1520) production in the effective Lagrangian method near threshold, E_γ^{LAB}<2 GeV, and in the quark-gluon string model at higher energies 3 GeV…

hep-ph2007★ 491 cited

CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes

Giovanni Ossola, Costas G. Papadopoulos, Roberto Pittau

We present a program that implements the OPP reduction method to extract the coefficients of the one-loop scalar integrals from a user defined (sub)-amplitude or Feynman Diagram, a…

hep-ph2007★ 28 cited

Neutrino induced threshold production of two pions and N^*(1440) electroweak form factors

E. Hernandez, J. Nieves, S. K. Singh +2

We study the threshold production of two pions induced by neutrinos in nucleon targets. The contribution of nucleon, pion and contact terms are calculated using a chiral Lagrangian…

hep-ph2007★ 33 cited

Heavy quark symmetry constraints on semileptonic form factors and decay widths of doubly heavy baryons

E. Hernandez, J. Nieves, J. M. Verde-Velasco

We show how heavy quark symmetry constraints on doubly heavy baryon semileptonic decay widths can be used to test the validity of different quark model calculations. The large disc…

hep-ph2007★ 40 cited

Total cross-section and rapidity gap survival probability at the LHC through an eikonal with soft gluon resummation

Andrea Achilli, Rohit Hegde, Rohini M. Godbole +3

New results are presented for total cross-sections, in the framework of our QCD based model (GGPS). This is an improved eikonal mini-jet model, where sof…

hep-ph2007★ 15 cited

Vector-Boson Production of Light Higgs Pairs in 2-Higgs Doublet Models

M. Moretti, S. Moretti, F. Piccinini +2

At the Large Hadron Collider, we prove the feasibility to detect pair production of the lightest CP-even Higgs boson of Type II 2-Higgs Doublet Models through $q q^{(')}\to q q…

hep-ph2007★ 23 cited

Semileptonic bc to cc Baryon Decay and Heavy Quark Spin Symmetry

Jonathan M. Flynn, Juan Nieves

We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons (Xi_{bc}^{(\prime*)}--> Xi_{cc}^{(*)} and Omega_{bc}^{(\prime*)}--> Omega_{cc}^{(*)})…

hep-ph2007★ 99 cited

Large underground, liquid based detectors for astro-particle physics in Europe: scientific case and prospects

D. Autiero, J. Aysto, A. Badertscher +68

This document reports on a series of experimental and theoretical studies conducted to assess the astro-particle physics potential of three future large-scale particle detectors pr…

hep-ph2007★ 22 cited

Long-lived Staus from Cosmic Rays

Markus Ahlers, Jose Ignacio Illana, Manuel Masip +1

The collision of a high energy cosmic ray with a nucleon in the upper atmosphere could produce long-lived heavy particles. Such particles would be very penetrating, since the energ…

hep-ph2007★ 23 cited

Like-sign dilepton signals from a leptophobic Z' boson

F. del Aguila, J. A. Aguilar-Saavedra

A new leptophobic neutral gauge boson Z' with small mixing to the Z can have a mass as light as M_Z' ~ 350 GeV, and still have escaped detection at LEP and Tevatron. Such a Z' boso…

hep-ph2007★ 26 cited

|Vub| from exclusive semileptonic B to pi decays revisited

Jonathan M Flynn, Juan Nieves

We update the extraction of |Vub| from exclusive semileptonic B to pi decays, combining experimental partial branching fraction information with theoretical form factor calculation…

hep-ph2007★ 55 cited

ATLAS sensitivity to Wtb anomalous couplings in top quark decays

J. A. Aguilar-Saavedra, J. Carvalho, N. Castro +2

We study the sensitivity of the ATLAS experiment to Wtb anomalous couplings in top pair production with semileptonic decay, pp -> t tbar -> W+ b W- bbar, with one of the W bosons d…

hep-ph2007★ 55 cited

Elastic s-wave B pi, D pi, D K and K pi scattering from lattice calculations of scalar form factors in semileptonic decays

Jonathan M Flynn, Juan Nieves

We show how theoretical, principally lattice, calculations of the scalar form factors in semileptonic pseudoscalar-to-pseudoscalar decays can be used to extract information about t…

hep-ph2007★ 15 cited

|Vub| from Exclusive Semileptonic B to pi Decays

Jonathan M Flynn, Juan Nieves

We use Omnes representations of the form factors f_+ and f_0 for exclusive semileptonic B to pi decays, paying special attention to the treatment of the B* pole and its effect on f…

hep-ph2007★ 217 cited

Heavy neutrino signals at large hadron colliders

F. del Aguila, J. A. Aguilar-Saavedra, R. Pittau

We study the LHC discovery potential for heavy Majorana neutrino singlets in the process pp -> W+ -> l+ N -> l+ l+ jj (l=e,mu) plus its charge conjugate. With a fast detector simul…

hep-ph2007★ 31 cited

Pion-photon Transition Distribution Amplitudes in the Spectral Quark Model

Wojciech Broniowski, Enrique Ruiz Arriola

The vector and axial pion-photon transition distribution amplitudes are analyzed in the Spectral Quark Model. We proceed by the evaluation of double distributions through the use o…

hep-ph2007

Spin Dependence of Heavy Quark Fragmentation

Fernando Cornet, Carlos A. Garcia Canal

We propose that the non-perturbative fragmentation functions describing the transition from a heavy quark to a heavy meson is proportional to the square of the produced meson wave…

hep-ph2007★ 9 cited

Impact of right-handed interactions on the propagation of Dirac and Majorana neutrinos in matter

F. del Aguila, J. Syska, M. Zralek

Dirac and Majorana neutrinos can be distinguished in relativistic neutrino oscillations if new right-handed interactions exist, due to their different propagation in matter. We rev…

hep-ph2007★ 55 cited

Power corrections in the quark-antiquark potential at finite temperature

E. Megias, E. Ruiz Arriola, L. L. Salcedo

A recently proposed phenomenological model, which includes nonperturbative effects from dimension two gluon condensates, is applied to analyze the available lattice data for the he…

hep-ph2007★ 98 cited

Nucleon Decay Searches with large Liquid Argon TPC Detectors at Shallow Depths: atmospheric neutrinos and cosmogenic backgrounds

A. Bueno, Z. Dai, Y. Ge +5

Grand Unification of the strong, weak and electromagnetic interactions into a single unified gauge group is an extremely appealing idea which has been vigorously pursued theoretica…

hep-ph2007★ 207 cited

Weak Pion Production off the Nucleon

E. Hernandez, J. Nieves, M. Valverde

We develop a model for the weak pion production off the nucleon, which besides the Delta pole mechanism (weak excitation of the resonance and its subsequent decay into $N…

hep-ph2007★ 10 cited

Little Higgs models with a light T quark

R. Barcelo, M. Masip, M. Moreno-Torres

We study Little Higgs models based on a SU(3)_1 x SU(3)_2 global symmetry and with two scales (the two vacuum expectation values f_{1,2}) substantially different. We show that all…