ترغب بنشر مسار تعليمي؟ اضغط هنا

Low Energy Probes of PeV Scale Sfermions

119   0   0.0 ( 0 )
 نشر من قبل Wolfgang Altmannshofer
 تاريخ النشر 2013
  مجال البحث
والبحث باللغة English




اسأل ChatGPT حول البحث

We derive bounds on squark and slepton masses in mini-split supersymmetry scenario using low energy experiments. In this setup gauginos are at the TeV scale, while sfermions are heavier by a loop factor. We cover the most sensitive low energy probes including electric dipole moments (EDMs), meson oscillations and charged lepton flavor violation (LFV) transitions. A leading log resummation of the large logs of gluino to sfermion mass ratio is performed. A sensitivity to PeV squark masses is obtained at present from kaon mixing measurements. A number of observables, including neutron EDMs, mu->e transitions and charmed meson mixing, will start probing sfermion masses in the 100 TeV-1000 TeV range with the projected improvements in the experimental sensitivities. We also discuss the implications of our results for a variety of models that address the flavor hierarchy of quarks and leptons. We find that EDM searches will be a robust probe of models in which fermion masses are generated radiatively, while LFV searches remain sensitive to simple-texture based flavor models.

قيم البحث

اقرأ أيضاً

We show that proton storage ring experiments designed to search for proton electric dipole moments can also be used to look for the nearly dc spin precession induced by dark energy and ultra-light dark matter. These experiments are sensitive to both axion-like and vector fields. Current technology permits probes of these phenomena up to three orders of magnitude beyond astrophysical limits. The relativistic boost of the protons in these rings allows this scheme to have sensitivities comparable to atomic co-magnetometer experiments that can also probe similar phenomena. These complementary approaches can be used to extract the micro-physics of a signal, allowing us to distinguish between pseudo-scalar, magnetic and electric dipole moment interactions.
78 - A.N. Akay 2014
IceCube collaboration has published two papers on ultrahigh energy neutrinos observation, recently. They have used the data collected in two years in their first publication, which reveals observation of two PeV energy neutrino events. The second pub lication of the collaboration including more data has also confirmed main features of the former paper. In literature, various interpretations of the IceCube data have been proposed. In this study, it is shown that PeV energy neutrino events observed by the IceCube collaboration can be interpreted as resonance production of color octet neutrinos with masses in $500-800$ GeV range.
129 - Marco Frasca 2010
We derive a low-energy quantum field theory from quantum chromodynamics (QCD) that holds in the limit of a very large coupling. All the parameters of the bare theory are fixed through QCD. Low-energy limit is obtained through a mapping theorem betwee n massless quartic scalar field theory and Yang-Mills theory. One gets a Yukawa theory that, in the same limit of strong coupling, reduces to a Nambu-Jona-Lasinio model with a current-current coupling with scalar-like excitations arising from Yang-Mills degrees of freedom. A current-current expansion in the strong coupling limit yields a fully integrated generating functional that, neglecting quark-quark current coupling, describes all processes involving glue excitations and quark. Some processes are analyzed and we are able to show consistency of Narison-Veneziano sum rules. Width of the $sigma$ resonance is computed. The decay $etatoeta+pi^++pi^-$ is discussed in this approximation and analyzed through the more elementary processes $etatoeta+sigma$ and $sigmatopi^++pi^-$. In this way we get an estimation of the mass of the $sigma$ resonance and the value of the $eta$ decay constant. This $eta$ decay appears a possible source of study for the $sigma$ resonance.
In multiscale models of walking technicolor, relatively light color-singlet technipions are produced in $q ol q$ annihilation in association with longitudinal $W$ and $Z$ bosons and with each other. The technipions decay as $tpiz ra b ol b$ and $tpip ra c ol b$. Their production rates are resonantly enhanced by isovector technirho vector mesons with mass $M_W + M_{tpi} simle M_{tro} simle 2 M_{tpi}$. At the Tevatron, these associated production rates are 1--10 picobarns for $M_{tpi} simeq 100,gev$. Such a low mass technipion requires topcolor-assisted technicolor to suppress the decay $t ra tpip b$. Searches for $tpitpi$ production will also be rewarding. Sizable rates are expected if $M_{tro} simge 2M_{tpi} + 10,gev$. The isoscalar $omega_T$ is nearly degenerate with $tro$ and is expected to be produced at roughly the same rate. The $omega_T$ should have the distinctive decay modes $omega_T ra gamma tpiz$ and $Z tpiz$.
In multiscale and topcolor-assisted models of walking technicolor, relatively light spin-one technihadrons $rho_T$ and $omega_T$ exist and are expected to decay as $rho_T to W pi_T, Z pi_T$ and $omega_T to gamma pi_T$. For $M_{rho_T} simeq 200 GeV$ a nd $M_{pi_T} simeq 100 GeV$, these processes have cross sections in the picobarn range in $bar p p$ colisions at the Tevatron and about 10 times larger at the Large Hadron Collider. We demonstrate their detectability with simulations appropriate to Run II conditions at the Tevatron.
التعليقات
جاري جلب التعليقات جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا