A new strategy for probing the Majorana neutrino CP violating phases and masses (2009)
Delepine, David, Macias, Vannia Gonzalez, Khalil, Shaaban, Castro, Gabriel Lopez
We propose a new strategy for detecting the CP-violating phases and the effective mass of muon Majorana neutrinos by measuring observables associated with neutrino-antineutrino oscillations in...
Lepton flavor violation in supersymmetric B-L extension of the standard model (2009)
Supersymmetric B-L extension of the Standard Model (SM) is one of the best candidate for physics beyond the SM that accounts for TeV scale seesaw mechanism and provides an attractive solution for the...
Supersymmetry and CP violation in B^0_s - \bar{B}^0_s mixing and B^0_s -> J/\psi \phi decay (2009)
Datta, Alakabha, Khalil, Shaaban
Supersymmetric contributions to time independent asymmetry in $B^0_s \to J/\psi \phi$ process are analyzed in the view of the recent Tevatron experimental measurements. We show that the experimental...
Electron EDM and soft leptogenesis in supersymmetric B-L extension of the standard model (2009)
Kajiyama, Yuji, Khalil, Shaaban, Raidal, Martti
We analyze the connection between electric dipole moment of the electron and the soft leptogenesis in supersymmetric $B-L$ extension of the standard model. In this model, the $B-L$ symmetry is...
Generalized Lepton Number and Dark Left-Right Gauge Model (2009)
Khalil, Shaaban, Lee, Hye-Sung, Ma, Ernest
In a left-right gauge model of particle interactions, the left-handed fermion doublet (nu,e)_L is connected to its right-handed counterpart (n,e)_R through a scalar bidoublet so that e_L pairs with...
On "non-Hermitian Quantum Mechanics" (2008)
Everitt, Mark J., Khalil, Shaaban, Zagoskin, Alexandre M.
A series of recent papers ``Faster than Hermitian Quantum Mechanics'' and related articles made a point of the possibility of a non-Hermitian, but PT-symmetric, operator to play the role of a...
Sterile right-handed neutrinos can be naturally embedded in a low scale gauged $U(1)_{B-L}$ extension of the standard model. We show that, within a low reheating scenario, such a neutrino is an...
Sterile neutrino dark matter in B-L extension of the standard model and galactic 511 keV line (2008)
PACS numbers: 95.35.+d, 13.15.+g, 98.80.Cq, 98.70.Rz.-- 10 pages, 1 figure.
Signatures for right-handed neutrinos at the Large Hadron Collider (2008)
Huitu, Katri, Khalil, Shaaban, Okada, Hiroshi, Rai, Santosh Kumar
We explore possible signatures for right-handed neutrinos in TeV scale B-L extension of the Standard Model (SM) at the Large Hadron Collider (LHC). The studied four lepton signal has a tiny SM...
Low scale B-L extension of the Standard Model at the LHC (2006)
The fact that neutrinos are massive indicates that the Standard Model (SM) requires extension. We propose a low energy (
Supersymmetric contributions to B --> K pi in the view of recent experimental result (2006)
Supersymmetric contributions to the branching ratios and CP asymmetries of B--> K pi decays are analyzed in the view of recent experimental measurements. We show that supersymmetry can still provide...
We derive new model independent constraints on the supersymmetric extensions of the standard model from the new experimental measurements of B_s -\bar{B}_s mass difference. We point out that...
Supersymmetric contributions to B -> D K and the determination of angle \gamma (2006)
We analyze supersymmetric contributions to B^- -> D^0 K^- and B^- ->\bar{D}^0 K^- processes. We investigate the possibility that supersymmetric CP violating phases can affect our determination for...
Probing Flavor Structure in Supersymmetric Theories (2005)
We analyze the possibility of probing the supersymmetric flavor structure through the constraints of the K and B meson systems and those of the electric dipole moments. We show that combining these...
CP asymmetries and branching ratios of B --> K \pi in supersymmetric models (2005)
We analyze the supersymmetric contributions to the direct and mixing CP asymmetries and also to the branching ratios of the B --> K \pi decays in a model independent way. We consider both gluino and...
Supersymmetric contributions to the CP asymmetry of the B --> phi K and B --> eta' K (2004)
We analyse the CP asymmetry of the B --> phi K and B --> eta' K processes in general supersymmetric models. We consider both gluino and chargino exchanges in a model independent way by using the mass...
Can the CKM phase be the only source of CP violation? (2003)
Khalil, Shaaban, Sanz, Veronica
We address the question of whether the CP violating phase in the CKM mixing matrix can be the only source of all CP violation. We show that in supersymmetric models with new flavour structure beyond...
CP violation in supersymmetric theories (2002)
We review the present status of CP violating problem in supersymmetric extensions of the standard model. We analyze the constraints imposed by the experimental limits of the electron, neutron, and...
CP violation in supersymmetric models with Hermitian Yukawa couplings and A-terms (2002)
We analyse the CP violation in supersymmetric models with Hermitian Yukawa and trilinear couplings. We show that Hermitian Yukawa matrices can be implemented in supersymmetric models with SU(3)...
New shifted hybrid inflation (2002)
Jeannerot, Rachel, Khalil, Shaaban, Lazarides, George
A new shifted hybrid inflationary scenario is introduced which, in contrast to the older one, relies only on renormalizable superpotential terms. This scenario is automatically realized in a concrete...
The Enigma of the Dark Matter (2001)
Khalil, Shaaban, Munoz, Carlos
One of the great scientific enigmas still unsolved, the existence of dark matter, is reviewed. Simple gravitational arguments imply that most of the mass in the Universe, at least 90%, is some...
Present and Future CP Measurements (2001)
Hurth, Tobias, Kim, Choong Sun, Shepherd-Themistocleous, Claire, Wilson, Fergus, Azfar, Farrukh, Barlow, Roger, ...
We review theoretical and experimental results on CP violation summarizing the discussions in the working group on CP violation at the UK phenomenology workshop 2000 in Durham.
Lepton-Flavor Violation with Non-universal Soft Terms (2001)
Carvalho, Daniel F., Gomez, Mario E., Khalil, Shaaban
We study the lepton-flavor violation processes tau ->mu gamma and mu->e gamma in two different examples of models with non-universal soft breaking terms derived from strings. We show that the...
Leptogenesis in smooth hybrid inflation (2001)
Jeannerot, Rachel, Khalil, Shaaban, Lazarides, George
We present a concrete supersymmetric grand unified model based on the Pati-Salam gauge group SU(4)_c x SU(2)_L x SU(2)_R and leading naturally to smooth hybrid inflation, which avoids the...
Leptogenesis in smooth hybrid inflation (2001)
Jeannerot, R., Khalil, Shaaban, Lazarides, George
We present a concrete supersymmetric grand unified model based on the Pati-Salam gauge group SU(4)_c x SU(2)_L x SU(2)_R and leading naturally to smooth hybrid inflation, which avoids the...
EDM-free supersymmetric CP violation with non-universal soft terms (2000)
Khalil, Shaaban, Kobayashi, Tatsuo, Vives, Oscar
Non-universality in the soft breaking terms is a common feature in most superstring inspired SUSY models. This property is required to obtain sizeable CP violation effects from SUSY and, on the other...
Cosmological implications of supersymmetric CP violating phases (1999)
We show that large SUSY phases have no significant effect on the relic density of the lightest supersymmetric particle (LSP). However, they are very significant for the detection rates. We emphasise...
Non universal gaugino phases and the LSP relic density (1999)
The cosmological relic density of the lightest supersymmetric particle (LSP) of type I string derived model is calculated. This model can accommodate large values of CP violating phases, and the...
Low energy consequences from supersymmetric models with left-right symmetry (1999)
Khalil, Shaaban, Shafi, Qaisar
We consider several low energy consequences arising from a class of supersymmetric models based on the gauge groups $SU(2)_L\times SU(2)_R \times U(1)_{B-L}$ and $SU(4)_C\times SU(2)_L \times...
Supersymmetric CP violation $\epsilon'/\epsilon$ due to asymmetric A-matrix (1999)
Khalil, Shaaban, Kobayashi, Tatsuo
We study contributions of supersymmetric CP phases to the CP violation $\epsilon'/\epsilon$ in models with asymmetric $A$-matrices. We consider asymmetric $A$-matrices, which are obtained from...
Supersymmetric CP violating Phases and the LSP relic density and detection rates (1999)
Khalil, Shaaban, Shafi, Qaisar
For varying values of $\tan\beta$, we study the effect of CP violating phases from the soft supersymmetry breaking terms in string-inspired models on the relic abundance and detection rates of the...
CP violation in supersymmetric model with non-degenerate A-terms (1999)
Khalil, Shaaban, Kobayashi, Tatsuo, Masiero, Antonio
We study the CP phases of the soft supersymmetry breaking terms in string-inspired models with non-universal trilinear couplings. We show that such non-universality plays an important role on all CP...
We examine the cancellation mechanism between the different contributions to the electric dipole moment of the neutron in a model with dilaton-dominated SUSY breaking. We find these accidental...
CP violation in a supersymmetric model with nondegenerate A terms (1999)
Khalil, Shaaban, Kobayashi, Tatsuo, Masiero, Antonio
We study the CP phases of the soft supersymmetry breaking terms in string-inspired models with non-universal trilinear couplings. We show that such non-universality plays an important role on all CP...
Yukawa Unification in Moduli-dominant SUSY Breaking (1997)
Khalil, Shaaban, Kobayashi, Tatsuo
We study Yukawa unification in string models with moduli-dominant SUSY breaking. This type of SUSY breaking in general leads to non-universal soft masses, i.e., soft scalar masses and gaugino masses....
From $b \to s \gamma$ to the LSP Detection Rates in Minimal String Unification Models (1997)
Khalil, Shaaban, Masiero, Antonio, Shafi, Qaisar
We exploit the measured branching ratio for $b \rightarrow s\gamma$ to derive lower limits on the sparticle and Higgs masses in the minimal string unification models. For the LSP('bino'), chargino...
Phenomenological implications of moduli-dominant SUSY breaking (1997)
Kawamura, Yoshiharu, Khalil, Shaaban, Kobayashi, Tatsuo
We study moduli-dominated SUSY breaking within the framework of string models. This type of SUSY breaking in general leads to non-universal soft masses, i.e. soft scalar masses and gaugino masses....
Supersymmetric Sum Rules In Minimal Superstring Unification (1996)
The Minimal superstring unification, assuming orbifold compactification, provides interesting and rather detailed implications on physics at low energy. The interesting feature of this model is that...
Sparticle and Higgs masses within minimal string unification (1996)
Khalil, Shaaban, Masiero, Antonio, Shafi, Qaisar
We consider the sparticle and higgs spectroscopy in a class of superstring inspired models in which the string threshold corrections ensure the consistency of the string unification scale with the...
Low Energy Implications of Minimal Superstring Unification (1995)
Khalil, Shaaban, Masiero, Antonio, Vissani, Francesco
We study the phenomenological implications of effective supergravities based on string vacua with spontaneously broken N=1 supersymmetry by dilaton and moduli $F$-terms. We further require Minimal...