Publications (7)18.35 Total impact
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ABSTRACT: We consider the constraints on SO(10) unified models coming from the lower limits on proton lifetime and on the scale of BL symmetry breaking within the framework of the seesaw model for neutrino masses. By upgrading a triangular relationship for the inverse of Majorana masses to the experimental situation with non maximal 23 mixing and non vanishing 13 mixing, we get for the sum of neutrino masses the upper limit 0.16 eV.Physical review D: Particles and fields 07/2012; 86(7). DOI:10.1103/PhysRevD.86.073014 · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Assuming a Zeelike matrix for the righthanded neutrino Majorana masses in the seesaw mechanism, one gets maximal mixing for vacuum solar oscillations, a very small value for Ue3 and an approximate degeneracy for the two lower neutrino masses. The scale of righthanded neutrino Majorana masses is in good agreement with the value expected in an SO(10)M model with Pati–Salam SU(4)×SU(2)×SU(2) intermediate symmetry.Modern Physics Letters A 11/2011; 15(01). DOI:10.1142/S0217732300000049 · 1.34 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In the framework of SO(10) gauge unification and the seesaw mechanism, we show that the upper bound on the mass of the heaviest righthanded neutrino $M_{R_3} < 3 \times 10^{11}$ GeV, given by the PatiSalam intermediate scale of $BL$ spontaneous symmetry breaking, constrains the observables related to the lefthanded light neutrino mass matrix. We assume such an upper limit on the masses of righthanded neutrinos and, as a first approximation, a Cabibbo form for the matrix $V^L$ that diagonalizes the Dirac neutrino matrix $m_D$. Using the inverse seesaw formula, we show that our hypotheses imply a triangular relation in the complex plane of the light neutrino masses with the Majorana phases. We obtain normal hierarchy with an absolute scale for the light neutrino spectrum. Two regions are allowed for the lightest neutrino mass $m_1$ and for the Majorana phases, implying predictions for the neutrino mass measured in Tritium decay and for the double beta decay effective mass $<m_{ee}>$.Physical review D: Particles and fields 07/2011; 86(3). DOI:10.1103/PhysRevD.86.033006 · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The discovery of some baryonantibaryon resonances has led us to consider 3q~3\bar{q} systems as possible candidates. We predict their spectrum in the framework of a constituent model, where the chromomagnetic interaction plays the main role. The relevant parameters are fixed by the present knowledge on tetraquarks. The emerging scenario complies well with experiment. Besides the description of the baryonantibaryon resonances, we find evidence for new tetraquark states, namely the a0(Y) in the hidden strangeness sector and, in the cs\bar{c}\bar{s} sector, the Y(4140) and the X(4350). A detailed account of the spectra and the decay channels is provided for future comparisons with data. Comment: 17 pagesPhysical review D: Particles and fields 12/2009; 81(7). DOI:10.1103/PhysRevD.81.074018 · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We present the spectrum of the lightest pentaquark states of both parities and compare it with the present experimental evidence for these states. We have assumed that the main role for their mass splittings is played by the chromomagnetic interaction. We have also kept into account the $SU(3)_F$ breaking for their contribution and for the spin orbit term. The resulting pattern is in good agreement with experiment. 
Article: SO(10)Inspired SeeSaw Mechanism
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ABSTRACT: We determine the nu_{R} Majorana mass matrix from the experimental data on neutrino oscillations in the framework of a seesaw SO(10) model, where we impose the condition (M^R)_{33} = 0 to avoid too large finetunings in the seesaw formula. We find a class of solutions with the two lowest neutrino masses almost degenerate and the scale of the matrix elements of M^R in the range 10^{11} 10^{12} GeV in agreement with PatiSalam intermediate symmetry. We find also solutions with smaller neutrino masses, for which the scale of M_R depends on the solution to the "solar neutrino problem" and on the value of the component of \nu_e along the highest mass eigenstate, U_{e3}.International Journal of Modern Physics A 02/2001; 16:609623. DOI:10.1142/S0217751X01003056 · 1.09 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Assuming a Zeelike matrix for the righthanded neutrino Majorana masses in the seesaw mechanism, one gets maximal mixing for vacuum solar oscillations, a very small value for $U_{e3}$ and an approximate degeneracy for the two lower neutrino masses. The scale of righthanded neutrino Majorana masses is in good agreement with the value expected in a SO(10) model with PatiSalam $SU(4)\ts SU(2)\ts SU(2)$ intermediate symmetry. Comment: 11 pages, no figures. References addedModern Physics Letters A 11/1999; DOI:10.1016/S02177323(00)000049 · 1.34 Impact Factor
Publication Stats
23  Citations  
18.35  Total Impact Points  
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Institutions

2012

University of Naples Federico II
 Department of Physical Sciences
Napoli, Campania, Italy
