Dr
Rocky So
(University of British Columbia)
13/03/2016 19:50
Experiment
YSF (Young Scientists Forum)
Using a sample of $(470.9 \pm 2.8) \times 10^6$ B meson pairs, we measure the decay branching fraction ${\mathcal{B}(B^0\to D^{*- }\pi^+ \pi^- \pi^+) = (7.26 \pm 0.11 \pm 0.31) \cdot 10^{-3}}$, where the first uncertainty is statistical and the second uncertainty is systematic. The measurement is 2.4 times more precise than the current world average value. This branching fraction includes...
Luka Santelj
(KEK - High Energy Accelerator Research Organization)
13/03/2016 19:57
Experiment
YSF (Young Scientists Forum)
The Belle II experiment at the SuperKEKB $e^+e^-$ collider will start its operation in 2018, with the goal of collecting 50 $ab^{-1}$ of data. This will allow for high precision measurements in the quark flavor sector, opening a window into physics at the energies beyond achievable at the high energy frontier experiments. In the talk we present the recent status of the SuperKEKB and Belle II...
M.
Andreas Weiden
(University Zurich)
13/03/2016 20:04
Experiment
YSF (Young Scientists Forum)
A search for direct $CP$ violation in the up-type quark sector is performed using pp collision data, corresponding to an integrated luminosity of 3fb$^{-1}$, collected using the LHCb detector at centre-of-mass energies of 7 and 8 TeV.
The difference between the $CP$ asymmetries in $D^0 \to K^-K^+$ and $D^0 \to \pi^-\pi^+$ decays, $\Delta A_{CP} \equiv A_{CP}(K^-K^+) - A_{CP}(\pi^-\pi^+)$ is...
M.
Josu Hernandez-Garcia
(IFT)
13/03/2016 20:11
Theory
YSF (Young Scientists Forum)
We derive constraints on the mixing of heavy Seesaw neutrinos with the SM fields. We explore and compare both a completely general scenario where the heavy neutrinos are integrated out and the more constrained case of only 3 extra heavy states. The latter assumption implies non-trivial correlations that do not allow to saturate all model-independent bounds.
Daniel O'Hanlon
(University of Warwick)
14/03/2016 19:30
Experiment
YSF (Young Scientists Forum)
The physics potential for b-baryon decays has been relatively untapped until the advent of the LHC, and as such important questions still exist of their fundamental properties, such as whether their decays exhibit CP violation. Presented here are observations of the decays $\Lambda_b^0 \rightarrow \Lambda K^+ \pi^-$ and $\Lambda_b^0 \rightarrow \Lambda K^+ K^-$, made at a significance level...
Dr
Son Cao
(Kyoto University)
14/03/2016 19:37
Experiment
YSF (Young Scientists Forum)
T2K (Tokai to Kamioka) is the world's first off-axis designed long-baseline experiment that was built for precision measurement of neutrino oscillations. The T2K experiment uses a high intensity, highly pure beam of muon (anti)neutrinos produced at J-PARC in Tokai, Japan. A Near Detector complex, 280 m downstream of the target, is operated to monitor and characterize the (anti)neutrino beam...
M.
Fabio Ferrari
(INFN - Sezione di Bologna)
14/03/2016 19:44
Experiment
YSF (Young Scientists Forum)
The scientific programme of LHCb includes a large number $CP$ violation measurements in $b$-hadron decays. To perform such measurements, one needs to disentangle the physical asymmetry from others spurious effects, such as production asymmetries arising from the flavour-asymmetric proton-proton collisions. Using an integrated luminosity of 1 fb$^{-1}$ collected at a centre-of-mass energy of 7...
Stefan de Boer
(TU Dortmund)
14/03/2016 19:51
Theory
YSF (Young Scientists Forum)
We study (semi)leptonic rare charm decays and its opportunities in searches for physics beyond the Standard Model (BSM). In particular, we analyze the impact of potential BSM physics in $c\to ull'$ transitions, notably branching ratios, angular observables, asymmetries and Lepton Flavor Violating decays. Testable effects are worked out model-independently and within Leptoquark models...
M.
Yoann Kermaidic
(LPSC)
14/03/2016 19:58
Experiment
YSF (Young Scientists Forum)
The quest for a non-zero electric dipole moment (EDM) of simple systems such as the electron, the neutron or atoms / molecules is a powerful way to search for physics beyond the standard model in particular for new sources of CP violation, complementary to LHC experiments. So far, no EDM signal was observed and the upper limit on the neutron EDM, established by the RAL/Sussex/ILL...
Mme
Gwenhaël de Wasseige
(Vrije Universiteit Brussel)
14/03/2016 20:05
Experiment
YSF (Young Scientists Forum)
Since the end of the eighties, in response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with solar flares, neutrino detectors have searched for signals of neutrinos associated with solar flare activity. The acceleration of protons in the magnetic structures of such flares produce mesons in collisions with the solar atmosphere which subsequently...
M.
Evgeny Soldatov
(National)
15/03/2016 19:45
Experiment
YSF (Young Scientists Forum)
The production of Z bosons with one or two isolated high energy photons is studied using pp collisions at 8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 $fb^{-1}$ collected by the ATLAS detector during the 2012 LHC data taking. The $Z\gamma$ and $Z\gamma\gamma$ production cross sections are measured with leptonic (ee, $\mu\mu$, $\nu\bar{\nu}$) decays of the Z...
M.
Roland Jansky
(University of Innsbruck)
15/03/2016 19:52
Experiment
YSF (Young Scientists Forum)
-
M.
Giulio Maria Pelaggi
(Università di Pisa & INFN)
15/03/2016 19:59
Theory
YSF (Young Scientists Forum)
Reinterpreting the naturalness principle, we address the hierarchy problem, proposing a phenomenologically interesting extension of the SM with a gauge group $SU(3)_L\otimes SU(3)_R\otimes SU(3)_c$, such that all the gauge, Yukawa and quartic couplings can be extrapolated up to infinite energy. We analyze which set of scalar or fermionic particles are needed to accomplish this goal. Finally,...
Mlle
Inna Kucher
(CEA Saclay)
15/03/2016 20:06
Experiment
YSF (Young Scientists Forum)
A search for a Higgs boson decaying to two photons has been performed by the CMS Collaboration at the LHC experiment using pp collisions at a center-of-mass energy of 13TeV with an integrated luminosity of 2.6/fb. In the decay of the Higgs boson into two photons, the unconverted final state photons are not detected in the tracker, so the determination of the associated primary vertex is not...
Mlle
DOUNIA CHERIGUI
(USTO)
15/03/2016 20:13
Theory
YSF (Young Scientists Forum)
In this work, we search for lepton flavor violation (LFV) interactions in the final $\ell_{\alpha}^{\pm }\ell_{\beta}^{\pm}\ell_{\gamma}^{\mp}+E_{miss}$ where ${\alpha}$, ${\beta}$, ${\gamma}$= $e,\mu,\tau$. This final state can be achieved via the production of singlet charged scalar $S^{\pm}$ in many neutrino mass models taking into account the allowed regions of masses and Yukawa couplings...
M.
Carlo Pandini
(LPNHE)
16/03/2016 19:40
Experiment
YSF (Young Scientists Forum)
A search for a heavy, CP-odd Higgs boson, A, decaying into a Z boson and a CP-even Higgs boson, h, with a mass of 125 GeV is performed using the ATLAS detector at the Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 3.2 /fb. Decays of h bosons to bb pairs, where the resulting hadronic jets can...
Sara Saa
(IFT-UAM Madrid)
16/03/2016 19:47
Theory
YSF (Young Scientists Forum)
In order to explore a possible dynamical nature for the Higgs field (such as its being a pseudogolsdtone boson) we develope a renormalizable Lagrangian based on the minimal SO(5) linear σ-model with the symmetry softly broken to SO(4), including gauge bosons and fermions. We then present the phenomenological implications and constraints from precision observables and the impact on present and...
M.
Clint Richardson
(Boston University)
16/03/2016 19:54
Experiment
YSF (Young Scientists Forum)
With the discovery of the Higgs Boson during Run 1, one of the most important questions to answer during Run 2 is the naturalness problem. Composite Higgs theories answer the naturalness problem by regulating the quadratic divergences to the mass of the Higgs boson via fermionic top partners. Often predicted in such models is a top partner with charge 5e/3 which can decay to the extremely...
M.
John Bradmiller-Feld
(UC Santa Barbara)
18/03/2016 19:40
Experiment
YSF (Young Scientists Forum)
We present results from a generic search for strongly-produced supersymmetric particles in pp collisions in the multijet + missing transverse momentum final state. The data sample corresponds to 2.3 fb$^{-1}$ recorded by the CMS experiment at $\sqrt{s}=13$ TeV. This search is highly motivated by both theoretical and experimental considerations. In supersymmetry (SUSY) theories disfavoring...
Mlle
Chaimae EL AISATI
(Universite Libre de Bruxelles)
18/03/2016 19:47
Theory
YSF (Young Scientists Forum)
In 2013, the IceCube experiment brought to light the existence of a flux of very high energy neutrinos. The origin of those neutrinos was shown to be extraterrestrial, as they do not fit atmospheric backgrounds at high energy. Still, where those neutrinos are exactly sourced from remains to this day an open question. In the context of dark matter searches, the discovery of a neutrino line...
Mme
Rocío del Rey Bajo
(UAM - IFT)
18/03/2016 19:54
Theory
YSF (Young Scientists Forum)
The Higgs portal to scalar Dark Matter is considered in the context of non-linearly realised electroweak symmetry breaking. We determine the dominant interactions of gauge bosons and the physical Higgs particle h to a scalar singlet dark matter candidate. Phenomenological consequences are also studied in detail, including the possibility of distinguishing this scenario from the standard Higgs...
Mme
chahrazed guella
(université des sciences et de la technologie mohamed boudiaf oran (algérie)), Mlle
dounia cherigui
(université des sciences et de la technologie mohamed boudiaf oran (algérie))
18/03/2016 20:01
Theory
YSF (Young Scientists Forum)
In this work, we investigate the possibility of probing a class of three-loop models for neutrino mass at the LHC with 8 and 14 TeV energies. The existence of lepton flavor violating interactions for singlet charged scalar, S±, that couples to the leptons could induce many processes such as pp -> ℓ± ℓ∓ E_{miss}. Using the processes with ℓ ℓ = ee, eμ, μμ, we found that an inclusive cut on the...
