ترغب بنشر مسار تعليمي؟ اضغط هنا

Status and future prospects for CLFV searches at BESIII

68   0   0.0 ( 0 )
 نشر من قبل Ming Gang Zhao
 تاريخ النشر 2016
  مجال البحث
والبحث باللغة English
 تأليف Ming-Gang Zhao




اسأل ChatGPT حول البحث

Here we present the latest results of the charged Lepton Flavor Violation process searches at the BESIII experiment in the decay of $J/psi$ to $emu$, using $(225.3pm2.8)times10^6$ $J/psi$ events collected with the BESIII detector at the BEPCII collider. An upper limit on the branching fraction of $B(J/psi rightarrow emu)<1.6times10^{-7}$ (90$%$ C.L.) is obtained. The prospects and challenges with the future data are also discussed based on MC simulation.

قيم البحث

اقرأ أيضاً

We discuss the future prospects of heavy neutrino searches at next generation lepton colliders. In particular, we focus on the planned electron-positron colliders, operating in two different beam modes, namely, $e^+e^-$ and $e^-e^-$. In the $e^+e^-$ beam mode, we consider various production and decay modes of the heavy neutrino ($N$), and find that the final state with $e+2j+{E!!!/}_T$, arising from the $e^+e^-to N u$ production mode, is the most promising channel. However, since this mode is insensitive to the Majorana nature of the heavy neutrinos, we also study a new production channel $e^+e^-to Ne^pm W^mp$, which leads to a same-sign dilepton plus four jet final state, thus directly probing the lepton number violation in $e^+e^-$ colliders. In the $e^-e^-$ beam mode, we study the prospects of the lepton number violating process of $e^-e^-to W^-W^-$, mediated by a heavy Majorana neutrino. We use both cut-based and multivariate analysis techniques to make a realistic calculation of the relevant signal and background events, including detector effects for a generic linear collider detector. We find that with the cut-based analysis, the light-heavy neutrino mixing parameter $|V_{eN}|^2$ can be probed down to $sim 10^{-4}$ at 95% C.L. for the heavy neutrino mass up to $400$ GeV or so at $sqrt s=500$ GeV with $100 rm{fb}^{-1}$ of integrated luminosity. For smaller mixing values, we show that a multivariate analysis can improve the signal significance by up to an order of magnitude. These limits will be at least an order of magnitude better than the current best limits from electroweak precision data, as well as the projected limits from $sqrt s=14$ TeV LHC.
The first description of the experimental program OKA with RF-separated K+/- beam at Protvino U-70 PS is presented. The parameters of the beam as well as the potential for CP-violation searches are discussed.
We propose to search the monophoton events at the BESIII detector and future Super Tau Charm Factory to probe the sub-GeV dark photon decay into lighter dark matter. We compute the cross section due to the dark photon associated a standard model phot on production, and study the corresponding standard model irreducible/reducible backgrounds. By using the data about 17 fb$^{-1}$ collected at the BESIII detector since 2011, we derive new leading limits of the mixing strength $varepsilon$, $varepsilonlesssim(1.1-1.6)times 10^{-4}$, in the mass range of 0.04 GeV $lesssim m_{A^prime} lesssim$ 3 GeV. With 30 ab$^{-1}$ data, STCF running at $sqrt{s} = 2$ GeV, can probe $varepsilon$ down to 5.1$times 10^{-6}$ when $m_{A^prime}=1$ GeV. For models of scalar and fermionic light thermal dark matter production via dark photon, we present the constrains on the dimensionless dark matter parameter $y=varepsilon^2alpha_D(m_chi/m_{A^prime})^4$ as function of the DM mass $m_{chi}$ at BESIII and future STCF, conventionally assuming the dark coupling constant $alpha_D=0.5$ and $m_{A^prime}=3 m_{chi}$. We find that BESIII can exclude model of scalar, Majorana, and pseudo-Dirac (with a small splitting) DM for the mass region 0.03$sim$1 GeV, 0.04$sim$1 GeV and 0.4$sim$1 GeV respectively. For values $alpha_Dlesssim 0.005$, combining the results from 2 GeV STCF with 30 ab$^{-1}$ data and BaBar, one can exclude the above three DM models in the mass region 0.001 GeV $lesssim m_{chi} lesssim$ 1 GeV.
There has recently been a dramatic renewal of interest in the subjects of hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like $XYZ$ states at BESIII and $B$ factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related $X(1835)$ meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII over the remaining lifetime of BEPCII operation. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCII to higher luminosity.
266 - M-H. Genest 2009
We review the current strategies to search for generic SUSY models with R-parity conservation in the ATLAS and CMS detectors at the LHC. The discovery reach in early data will be presented for the different search channels based on missing transverse momentum from undetected neutralinos and multiple jets. We will also describe the search for models of gauge-mediated supersymmetry breaking for which the NLSP is a neutralino decaying to a photon and a gravitino. Finally, we will present recent work on techniques used to reconstruct the decays of SUSY particles at the LHC in early data, based on the selection of final-state exclusive decay chains.
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