The observation of excess gamma-gamma events with an invariant mass around 750 GeV.
The mechanisms behind baryonic decays of heavy flavoured particles remain mysterious and challenging to describe theoretically. Amongst interesting features observed by previous experiments it is worth mentioning the suppression of branching fractions to two-body final states and threshold enhancements in higher multiplicity decays. The large data sample accumulated by the LHCb experiment...
LHCb has collected the world's largest sample of beauty hadrons. This sample is used to search for new sources of CP violation, and to measure $B^0_{d/s}$ mixing parameters. We present a selection of recent measurements performed by the LHCb experiment using the full Run 1 dataset. Among these: the measurements of the mixing-induced CP-violating phase $\phi_s$ in the $B^0_s - \bar B^0_s$...
A detector talk covering a system US institutions have played a large role in: Cincinnati, Hawaii, PNNL, South Carolina, Pittsburgh, Mississippi, and Indiana worked on the barrel TOP detector.
LHCb has collected the world's largest sample of charmed hadrons. This sample is used to search for direct and indirect CP violation in charm, and to measure neutral D-meson mixing parameters. New measurements from several decay modes are presented, with complementary time-dependent and time-integrated analyses.
The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII)
has accumulated the world's largest e+e- collision samples at ψ(3770)
peak, around the ψ(4040) nominal mass, and at the Λc-pair mass threshold
which allow us to study decays of charmed mesons and baryons in a uniquely
clean background. In this talk, we will review our recent
results including: (1) the extractions of...
Charmless b-meson and b-baryon decays to pseudoscalar or vector mesons proceed via suppressed b—>u tree and b—>s,d penguin diagrams, and are sensitive probes of physics beyond the Standard Model. Relevant observables are branching fractions, CP asymmetries, polarisation fractions and T-odd correlations. Unexpected values of these observables have the potential to reveal New Physics. Moreover...
The nature of Dark Matter is one of the prominent open-questions in physics at present: although gravitational observations proof that matter in our Universe is mainly made of DM, very little is known about it. While most of "traditional" DM experiments are designed and optimized to prove the weak-force mass scale, O(100 GeV), the light DM
(LDM) region, O(10 MeV - 1 GeV) is, so far, almost...
The physics programme of the LHCb experiment has been expanded recently to new areas, notably including heavy ion data. In this talk we present measurements of heavy flavour production in pp collision at various centre-of-mass energies. These results are important inputs for QCD effective models predicting the production cross-sections and polarisations of heavy flavoured hadrons. Furthermore,...
The quantity ε'/ ε measures direct CP violation in Kaon decays. Recent analysis of this ratio did result in a 2.9 sigma discrepancy between the Standard Model predictions and the experimental data. Our ability to observe or constrain New Physics depends on the accuracy of determining the SM ”background”, so precise evaluation of ε'/ ε in this framework is particularly important. In this talk I...
The T2K long-baseline neutrino oscillation experiment has been running in anti-neutrino mode since 2014 in order to perform an electron anti-neutrino appearance search, which is an essential step to a lepton CP-violation measurement, as well as a muon anti-neutrino disappearance measurement, which could be different from that of neutrinos if CPT symmetry is violated or unknown neutrino-matter...
The BESIII experiment at the electron positron collider BEPCII in Beijing is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world’s largest data samples at the J/ψ and ψ(2S) resonances. In particular decays of these two resonances provide a rich and clean environment to study hadrons consisting out of light quarks and search for...
The BABAR Collaboration has an intensive program studying hadronic cross sections in
low-energy e+e- annihilations, accessible via initial-state radiation.
Our measurements allow significant improvements in the precision of the
predicted value of the muon anomalous magnetic moment.
These improvements are necessary for shedding light on the current ~3 sigma
difference between the...
Measurements of the cross section e+e- --> pi+pi-, i.e. of the pion form
factor, are known to be decisive for the hadronic contribution of the
anomalous magnetic moment of the muon, (g-2)mu. We present a new
measurement of the pion form factor at BESIII in the energy range between
600 and 900 MeV, which corresponds to the peak region of the rho and omega
resonances. The method of initial...
The high collision energies available at the LHC allow for an abundant production of hard probes, such as quarkonia, high-$p_{\rm T}$ jets and vector bosons (W, Z), which are produced in initial hard parton scattering processes. The latter decay before the formation of the Quark-Gluon Plasma (QGP), which is a deconfined phase of QCD matter produced in high-energy heavy-ion collisions....
[with a not-yet defined ATLAS speaker]
Search for deviations from the standard model is performed in the
systems of the neutral B mesons. The Bs system is studied in the decay
into J/psi phi. The mixing phase phi_s and the width difference
DeltaGamma_s are determined through the simultaneous study of angular
distributions in the final state and of the decay time, performed
together with...
The production rates of $b$ and $c$-hadrons in pp collisions are not expected to be identical to those of $\bar b$ and $\bar c$-hadrons due to the fact that there can be coalescence between a heavy quark produced in the hard scattering and $u$ and $d$ valence quarks in the remnant of colliding protons. In this talk we present the latest LHCb measurements on production asymmetries of $b$ and...
[with a not-yet defined ATLAS speaker]
ATLAS has a wide programme to study the production properties of
conventional and exotic quarkonium, beauty, and charm bound states.
This presentation will cover the latest results on J/psi, psi2s and
Upsilon production at 7, 8, and 13 TeV, D meson and X(3872) production
with Run-1 data, B+ production at 13 TeV, and studies of associated
production...
The feasibility of measuring of BR($K^0_L \rightarrow \pi^0\nu\overline{\nu}$) using a high-energy secondary neutral beam at the CERN SPS is being studied. Assuming reuse of
the NA48 liquid-krypton calorimeter and some of the NA62 infrastructure, the studies suggest a sensitivity approaching that proposed by KOTO Step 2 is achievable in five years of running. We summarize the studies thus...
Radiative b-hadron decays are sensitive probes of New Physics through the study of branching fractions, CP asymmetries and photon polarisation measurements. During the LHC Run 1, the LHCb experiment has collected large samples of radiative b-hadron decays. We present the latest LHCb measurements, including new results on the time dependence of Bs → φγ decays. These results help to constrain...
[with a not-yet defined ATLAS speaker]
Processes involving the FCNC transitions in b-hadron decays
are suppressed in the SM and are sensitive to new physics. New results
in the search for the rare decays of Bs and Bd into mu+mu- are
presented. They are based on the full sample of data collected by
ATLAS at 7 and 8 TeV collision energy. The consistency with the SM and
with other available...
Rare decays of beauty and charm hadrons test the flavour structure of the underlying theory at the level of quantum corrections. They provide information on the couplings and masses of heavy virtual particles appearing as intermediate states. A review of recent results obtained by LHCb on these topics will be presented.
The OPERA experiment at the Gran Sasso underground laboratory has
recently established nu_mu -> nu_tau oscillations in appearance mode
with a significance of 5.1 sigma thanks to the observation of five
signal candidate events in a sample with a signal-to-background ratio
of about ten.
The nu_tau data analysis will be discussed, with emphasis on the
background constraints obtained by...
A search for top squarks in events with jets and missing transverse momentum is presented. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the LHC and correspond to an integrated luminosity of 2.3 fb$^{−1}$. Events are categorized by the properties of reconstructed jets, the presence of top quark candidates, and missing...
[with a not-yet defined ATLAS speaker]
Latest results in the ATLAS programme of heavy hadron production and
spectroscopy are presented. These include the latest searches for the
bottomonium counterpart to the X(3872), studies of B_c and Lambda_b
decays, measurement of b-quark fragmentation functions, and searches
for new exotic bound states.
The NA48/2 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2003-2004.
A new upper limit on the rate of the lepton number violating decay K+- --> pi-+ mu+- mu+- obtained from this sample is reported: 8.6 × 10^−{11} at 90% CL, which improves by more than an order of magnitude
upon the previous measurements. Searches for...
Measurements of CP violation in neutral B-meson mixing are excellent probes to search for physics beyond the Standard Model. Recent measurements of the semileptonic asymmetries, Asls and Asld, obtained using the full Run 1 dataset collected by the LHCb experiment are presented.
We present results on radiative and electroweak-penguin decays based on the full BABAR dataset. The decays B->K* l+l- (both charged and neutral modes) are studied using an angular analysis to extract the quantities A_FB and F_L, which are sensitive to potential effects of physics beyond the Standard Model. Furthermore, the quantity P_2, which is subject to smaller theoretical uncertainties...
Lepton flavour universality (LFU) is one of the distinctive features of the Standard Model. Any violation of LFU would be a clear sign of new physics. Existing hints of non universality are already present in the leptonic and
semileptonic sectors. Semitauonic decays, in particular, are sensitive to contributions from non-Standard-Model particles that preferentially couple to the third...
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati
(LNF) is currently taking data at the upgraded e+e- DAFNE collider.
KLOE-2 represents the continuation of KLOE with a new physics program
mainly focused on the study of K short, η and η′ decays as well as on
kaon interferometry, test of discrete symmetries, and search for
physics beyond the Standard Model. The new data...
The Muon g-2 Experiment at Fermilab will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the muon’s electric dipole moment (EDM) by approximately two orders of magnitude with a sensitivity down to 10-21...
The long standing problem of reconciling the cosmological evidence of the existence of dark matter with the lack of any clear experimental observation of it, has recently revived the idea that the new particles are not directly connected with the Standard Model gauge fields, but only through mediator fields or “portals”, connecting our world with new “secluded” or “hidden” sectors.
One of...
