نتایج جستجو برای: hadron parity
تعداد نتایج: 42526 فیلتر نتایج به سال:
Studies of the spin and parity quantum numbers of the Higgs boson in the WW ∗→ eνμν final state are presented, based on proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1 at a centre-ofmass energy of √ s = 8 TeV. The Standard Model spinparity JCP = 0++ hypothesis is compared with alternative hypothese...
Studies of the spin and parity quantum numbers of the Higgs boson in the WW ∗→ eνμν final state are presented, based on proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1 at a centre-ofmass energy of √ s = 8 TeV. The Standard Model spinparity JCP = 0++ hypothesis is compared with alternative hypothese...
Motivated by the observation of exotic structure around 6900MeV in $J/\psi$-pair mass spectrum using proton-proton collision data LHCb collaboration, we study spectra fully-heavy tetraquarks within Bethe-Salpeter equation and Regge trajectory relation. The $X(6900)$ may be explained as a radially excited state with quark content $cc\bar{c}\bar{c}$ spin-parity $0^{++}(3S)$ or $2^{++}(3S)$ an orb...
A search is presented for new phenomena in events characterised by high jet multiplicity, no leptons (electrons or muons), and four more jets originating from the fragmentation of $b$-quarks ($b$-jets). The uses 139 fb$^{-1}$ $\sqrt{s}$ = 13 TeV proton-proton collision data collected ATLAS experiment at Large Hadron Collider during Run 2. dominant Standard Model background originates multijet p...
In the U(1)N extension of the supersymmetric standard model with E6 particle content, the heavy singlet superfield N may decay into a quark and a diquark as well as an antiquark and an antidiquark, thus creating a baryon asymmetry of the Universe. We show how the three doublet and two singlet neutrinos in this model acquire mass from physics at the TeV scale without the benefit of using N as a ...
The current theoretical status in the analysis and interpretation of low-mass dilepton measurements in (ultra-) relativistic heavy-ion experiments is reviewed. Special emphasis is put on potential signals of (partial) restoration of dynamically broken chiral symmetry in a hot and dense hadronic medium. It follows from chiral symmetry alone that parity partners of hadronic correlation functions ...
If neutrinos from a supernova pass through the Earth before reaching the detector, their energy spectra were shown to allow identification of their mixing scenarios. Precise values of the solar neutrino mass and mixing parameters were determined from a global data analysis. The difference between the survival probabilities of muon neutrino and antineutrino beams at long baselines, was shown to ...
A search is performed for a heavy particle decaying into different flavour dilepton pairs (eμ, eτ or μτ), using 3.2 fb −1 of proton–proton collision data at √ s = 13 TeV collected in 2015 by the ATLAS detector at the Large Hadron Collider. No excess over the Standard Model prediction is observed. Limits at the 95 % credibility level are set on the mass of a Z boson with lepton-flavour-violating...
W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under naïve T reversal where both the three-momenta and angular momenta are reversed. Perturbative QCD predicts nonzero polarization at the one-loop level, which can be measured as parity-odd components in the angular distribution of ch...
We present a direct measurement of the parity-violation parameter A c in the coupling of the Z 0 to c-quarks with the SLD detector. The measurement is based on a sample of 530k hadronic Z 0 decays, produced with a mean electron-beam polarization of |P e | = 73%. The tagging of c-quark events is performed using two methods: the exclusive reconstruction of D * + , D + , and D 0 mesons, and the so...
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