Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks

A search is presented for narrow heavy resonances X decaying into pairs of Higgs bosons (H) in proton-proton collisions collected by the CMS experiment at the LHC at root s = 8 TeV. The data correspond to an integrated luminosity of 19.7 fb(-1). The search considers HH resonances with masses between 1 and 3 TeV, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and t (t) over bar events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95 confidence level for the product of the production cross section and branching fraction sigma(gg -> X) B(X -> HH -> b (b) over barb (b) over bar) range from 10 to 1.5 fb for the mass of X from 1.15 to 2.0 TeV, significantly extending previous searches. For a warped extra dimension theory with amass scale Lambda(R) = 1 TeV, the data exclude radion scalar masses between 1.15 and 1.55 TeV

Measurement of the top quark mass using charged particles in pp collisions at root s=8 TeV

Peer reviewe

Measurement of the Splitting Function in &ITpp &ITand Pb-Pb Collisions at root&ITsNN&IT=5.02 TeV

Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.Peer reviewe

Search for anomalous couplings in boosted WW/WZ -> l nu q(q)over-bar production in proton-proton collisions at root s=8TeV

Peer reviewe

Search for supersymmetry in events with one lepton and multiple jets in proton-proton collisions at root s=13 TeV

Peer reviewe

Pathology of microstructural brain connectivity in paranoid schizophrenia (according to diffusion-tensor tractography data)

AIM: revealing microstructural brain connectivity alterations in patients with paranoid schizophrenia.&#x0D; MATERIALS AND METHODS: 25 patients diagnosed with paranoid schizophrenia were examined. The control group was 30 healthy people without neurological and somatic diseases. Studies were carried out on the Philips Ingenia magnetic resonance tomograph, with a magnetic field strength of 1.5 T using the DTI pulse sequence. Data processing was carried out using the tractographic module DSI Studio.&#x0D; RESULTS: According to the group assessment of the obtained tractographic brain data, significant differences in microstructural connectivity in the group of patients with paranoid schizophrenia were detected. A pathological conglomerate of cortical-subcortical structure connectivity was found, different from the sets of normal connections in the control group, consisting of a cingulate gyrus, hippocampus and thalamus. Such a pathological control center is one of the possible tractographic patterns of schizophrenia. In our opinion, the pathological connectivity of the hippocampus and thalamus, as one of the main components of the limbic system of the brain, reduces the controlling emotional function of the cingulate cortex, the control center of this system. In this case, excessive connectivity of the hippocampus with the cingulate cortex may indicate an incorrect implementation of their interaction, which also affects the occurrence or progression of emotional-will disorders. The thalamus, being the center of transmission of sensory and motor information from the sensory organs, can transmit incorrect redundant data about what is happening around the body and participate in the formation of auditory and visual hallucinations. Also, the pathological work of the thalamus may be involved in the progression of autism. Thus, the patient is increasingly losing touch with reality, increasingly preferring unknowingly fantasy, erasing ties with reality. Data from one of the characteristics of the artiformal neural network the clustering coefficient were significantly increased in patients compared to the control group, which may indicate the presence of excess, abnormal microstructural connectivity in the network.&#x0D; CONCLUSION: The study confirms the presence of microstructural and neural network changes in the hippocampus, thalamus, cingulate cortex and basal ganglia. These changes are peculiar tractographic semiotic signs of brain pathology in paranoid schizophrenia. This study is a step in the search for a tool to identify the features of neuroplasticity disorders in this disease and schizophrenia screening (2 figures, 3 tables, bibliography: 13 refs).</jats:p