Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the bb final state in p p collisions at √ s = 13 TeV with the ATLAS detectorThe ATLAS Collaboration A search for a heavy neutral Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, is performed using a data sample corresponding to an integrated luminosity of 36.1 fb −1 from proton-proton collisions at √ s = 13 TeV recorded in 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. The search considers the Z boson decaying to electrons or muons and the H boson into a pair of b-quarks. No evidence for the production of an A boson is found. Considering each production process separately, the 95% confidencelevel upper limits on the pp → A → Z H production cross-section times the branching ratio H → bb are in the range of 14-830 fb for the gluon-gluon fusion process and 26-570 fb for the b-associated process for the mass ranges 130-700 GeV of the H boson and 230-800 GeV of the A boson. The results are interpreted in the context of two-Higgs-doublet models.Electrons are reconstructed from energy clusters in the electromagnetic calorimeter that are matched to tracks in the inner detector [52]. Electrons are required to have |η| < 2.47 and p T > 7 GeV. To distinguish electrons from jets, isolation and quality requirements are applied [53]. The isolation requirements (the 'LooseTrackOnly' working point) are defined by the p T of tracks within cones around the electron with a size that decreases as a function of the transverse energy. The quality requirements (the 'Loose' working point) refer to both the inner detector track and the calorimeter shower shape. The efficiency for an electron to be reconstructed and meet these criteria is about 85% for electron p T > 7 GeV and increases to about 90% for p T > 27 GeV.Muons are reconstructed by matching tracks reconstructed in the inner detector to tracks or track segments in the muon spectrometer [54]. Muons used for this search must have |η| < 2.5 and p T > 7 GeV, and are required to satisfy 'LooseTrackOnly' isolation requirements, similar to those used for electrons, as well as inner detector and muon spectrometer track 'Loose' quality criteria, corresponding to an efficiency of about 97%.Jets are reconstructed using the anti-k t algorithm [55,56] with radius parameter R = 0.4 from clusters of energy deposits in the calorimeter system [57]. Candidate jets are required to have p T > 20 GeV (p T > 30 GeV) for |η| < 2.5 (2.5 < |η| < 4.5). Low-p T jets from pile-up are rejected by a multivariate algorithm that uses properties of the reconstructed tracks in the event [58].Jets containing b-hadrons are selected using a multivariate tagging algorithm (b-tagging) [59,60]. The energy of the tagged jet (b-jet) is corrected for the average energy loss from semileptonic decays of b-hadrons and out-of-jet-cone tracks with large impact parameters [61]. The b-tagging efficiency for the jet p T range used in this analysis is between 65% and 75%. Applying the b-tagging algor...

No abstract

No abstract

We will examine the muon g − 2 anomaly with the background of the Higgs global fit data in the framework of the Left-Right Twin Higgs (LRTH) Models. The joint constrains of the precision electroweak data, the 125 GeV Higgs data, the leptonic flavor changing decay μ → eγ decays, and the mass requirement of the right-handed neutrino ν R , the vector-like top partner T and the heavy gauge boson W H , m ν R > m T > m W H , are all considered in our calculation. Furthermore, since the neutral scalar φ 0 may be lighter than the 125 GeV Higgs, the direct searches from the h → φ 0 φ 0 channels can impose stringent upper limits on Br(h → φ 0 φ 0 ), which will reduce the allowed region of m φ 0 and f , the vacuum expectation value of the SM right-handed Higgs H R . It is concluded that the muon g-2 anomaly can be explained in the region of 700 GeV ≤ f ≤ 1100 GeV, 13 GeV ≤ m φ 0 ≤ 55 GeV, 100 GeV ≤ m φ ± ≤ 900 GeV, m ν R ≥ 15 TeV, and 200 GeV ≤ M ≤ 800 GeV, after imposing all the constraints mentioned above, where M here means the mass mixing coefficient Mq L q R , allowed by gauge invariance.

Motivated by the R D ( * ) anomalies which may imply hints of New Physics in the flavor sector and which can be explained by adding a single vector leptoquark U 3 (3, 3, 2/3) to the Standard Model as well as by the abundant B * data samples at high-luminosity collider experiments in the future, we further probe the New Physics effects of the vector leptoquark in the semileptonic B * d,s → Pτν τ (P = D, D s , π, K ) decays which are induced by the transitions b → (u, c)τν τ at the quark level. We investigate the New Physics leptoquark effects in the observables including the differential branching fractions and their ratios, lepton forward-backward asymmetry and lepton polarization asymmetry. We find the contributions of the vector leptoquark to the differential branching fractions and their ratios to be significant, and they show large deviations from the corresponding Standard Model predictions, while the lepton forward-backward asymmetry and the lepton polarization asymmetry in the leptoquark scenario show the same behaviors as that in the Standard Model.