ترغب بنشر مسار تعليمي؟ اضغط هنا

Search for low-Mass Higgs states @ BaBar

175   0   0.0 ( 0 )
 نشر من قبل Valentina Santoro
 تاريخ النشر 2012
  مجال البحث
والبحث باللغة English
 تأليف Valentina Santoro




اسأل ChatGPT حول البحث

Several types of new-physics models predict the existence of light dark matter candidates and low-mass Higgs states. Previous babar searches for invisible light-Higgs decays have excluded large regions of model parameter space. We present searches for a dark-sector Higgs produced in association with a dark gauge boson and searches for a light Higgs in $Upsilon (nS)$ decays.



قيم البحث

اقرأ أيضاً

Many extensions of the Standard Model introduce a new type of weak-interacting degrees of freedom. These models are motivated by the results of recent experimental anomalies. Typical models, such as Next-to-Minimal Supersymmetric Standard Model and L ight Hidden Dark-sector Model, introduce the possibilities of low-mass Higgs and dark bosons. The masses of such particles are expected to be few GeV and thus making them accessible at BESIII experiment, an $e^+e^-$ collider experiment running at tau-charm region. This report summarizes the recent results of low-mass Higgs and dark bosons searches at BESIII.
219 - Elisabetta Prencipe 2014
One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. The $BABAR$ experiment has extensively studied those in B meson decays , initial state radiation processes and two photon reactions. The study of the process $B rightarrow J/psi phi K$, with a search for the resonant states X(4140) and X(4270) in their decays to $J/psi phi$, will be highlighted. The recent results of the Dalitz analysis of $eta_c$ to 3 pseudoscalar mesons, via 2-photon interactions, will be presented in this report
Two of the most pressing questions in physics are the microscopic nature of the dark matter that comprises 84% of the mass in the universe and the absence of a neutron electric dipole moment. These questions would be resolved by the existence of a hy pothetical particle known as the quantum chromodynamics (QCD) axion. In this work, we probe the hypothesis that axions constitute dark matter, using the ABRACADABRA-10cm experiment in a broadband configuration, with world-leading sensitivity. We find no significant evidence for axions, and we present 95% upper limits on the axion-photon coupling down to the world-leading level $g_{agammagamma}<3.2 times10^{-11}$ GeV$^{-1}$, representing one of the most sensitive searches for axions in the 0.41 - 8.27 neV mass range. Our work paves a direct path for future experiments capable of confirming or excluding the hypothesis that dark matter is a QCD axion in the mass range motivated by String Theory and Grand Unified Theories.
A search for a Higgs boson with suppressed couplings to fermions, $h_f$, assumed to be the neutral, lower-mass partner of the Higgs boson discovered at the Large Hadron Collider, is reported. Such a Higgs boson could exist in extensions of the standa rd model with two Higgs doublets, and could be produced via $pbar{p} to H^pm h_f to W^* h_f h_f to 4gamma + X$, where $H^pm$ is a charged Higgs boson. This analysis uses all events with at least three photons in the final state from proton-antiproton collisions at a center-of-mass energy of 1.96~TeV collected by the Collider Detector at Fermilab, corresponding to an integrated luminosity of 9.2~${rm fb}^{-1}$. No evidence of a signal is observed in the data. Values of Higgs-boson masses between 10 and 100 GeV/$c^2$ are excluded at 95% Bayesian credibility.
85 - David Norvil Brown 2015
We present the results of a search for a dark photon decaying to $e^+e^-$ or $mu^+mu^-$ in the babar detector. We find no evidence for such a dark photon and set upper limits on the dark mixing as a function mass, tightening the constraints on the parameter space of several dark sector theories.
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