We report the observation of the X(3872) in the J/psi pi+pi- channel, with J/psi decaying to mu+mu- in p-p(bar) collisions at sqrt(s) = 1.96 TeV. Using approximately 230 pb^-1 of data collected with ...the Run II D0 detector, we observe 522 +/- 100 X(3872) candidates. The mass difference between the X(3872) state and the J/psi is measured to be 774.9 +/- 3.1 (stat.) +/- 3.0 (syst.) MeV/c^2. We have investigated the production and decay characteristics of the X(3872), and find them to be similar to those of the psi(2S) state.
A search for narrow resonances that decay into t-tbar pairs has been performed using 130 pb^{-1} of data in the lepton+jets channel collected in p-pbar collisions at \sqrt{s} = 1.8 TeV. There is no ...significant deviation observed from the standard model, and upper limits at the 95 % confidence level on the product of the production cross section and branching fraction to t-tbar are presented for narrow resonances as a function of the resonance mass M_X. These limits are used to exclude the existence of a leptophobic topcolor particle with mass M_X < 560 GeV/c^2 and width \Gamma_X = 0.012 M_X.
Using 85.2 +/- 3.6 pb^-1 of p-pbar collisions collected at sqrt(s)=1.8 TeV with the D0 detector at Fermilab's Tevatron Collider, we present the results of a search for direct pair production of ...scalar top quarks ~t, the supersymmetric partners of the top quark. We examined events containing two or more jets and missing transverse energy, the signature of light scalar top quark decays to charm quarks and neutralinos. After selections, we observe 27 events while expecting 31.1 +/- 6.4 events from known standard model processes. Comparing these results to next-to-leading-order production cross sections, we exclude a significant region of ~t and neutralino phase space. In particular, we exclude the ~t mass m_~t < 122 GeV/c^2 for a neutralino mass of 45 GeV/c^2.
We have searched for the signature of 3- and 4-body decays of pair-produced scalar top quarks (stop) in the inclusive final state containing an electron, a muon, and significant missing transverse ...energy using a sample of p p ̄ events corresponding to 108.3 pb −1 of data collected with the DØ detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard model assuming that the neutralino ( χ ̃ 0 1 ) is the lightest supersymmetric particle and is stable. No evidence for a signal is found and we derive cross-section upper limits as a function of stop ( t̃ ) and neutralino masses in different decay scenarios leading to the bℓν χ ̃ 0 1 final state. (Elsevier)
The use of the computer in an educational classroom has led to alternative styles and methods of teaching. The new methods are currently being developed and implemented into classrooms. One such ...program, Cognitive Tutor, developed by Carnegie Learning has been put in place in South Plainfield High School, New Jersey. This program was implemented in the hopes of helping students considered at risk of being unsuccessful on the New Jersey state mandated High School Proficiency Assessment. The scores of the students enrolled into this program were monitored at every level of state testing starting with the Grade Eight Proficiency Assessment followed by the Ninth Grade Practice High School Proficiency Test, Tenth Grade Practice High School Proficiency Test, and then finally the eleventh grade High School Proficiency Assessment. These findings are to be used to determine if the program was successful or not in South Plainfield High School.
Identification in group therapy Briskin, G. J
Journal of abnormal and social psychology,
03/1958, Letnik:
56, Številka:
2
Journal Article
"The Ss of this study were male and female adolescents (12-15 years of age) who were asked to volunteer to participate in groups that "would discuss adolescent problems.' Those who volunteered were ...rated by their teachers on emotional adjustment. Ss rated as most poorly adjusted were eliminated from the study. Three therapy groups were organized, each composed of five boys and five girls, each in the charge of a different therapist. The members of the group were given a special questionnaire, designed to assess needs, and a group form of the Rorschach before therapy began. At the conclusion of therapy, all Ss again took the questionnaire . . . . The hypotheses that both rigidity and lability were inversely related to identification were tested by correlational methods. Results were positive in both instances." From Psyc Abstracts 36:01:1IG95B.
We present a search for large extra dimensions (ED) in pp collisions at a center-of-mass energy of 1.8 TeV using data collected by the DØ detector at the Fermilab Tevatron in 1994-1996. Data ...corresponding to 78.8+/-3.9 pb(-1) are examined for events with large missing transverse energy, one high-p(T) jet, and no isolated muons. There is no excess observed beyond expectation from the standard model, and we place lower limits on the fundamental Planck scale of 1.0 and 0.6 TeV for 2 and 7 ED, respectively.
We have searched for the signature of 3- and 4-body decays of pair-produced scalar top quarks (stop) in the inclusive final state containing an electron, a muon, and significant missing transverse ...energy using a sample of pp̄ events corresponding to 108.3 pb−1 of data collected with the DØ detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard model assuming that the neutralino (χ̃01) is the lightest supersymmetric particle and is stable. No evidence for a signal is found and we derive cross-section upper limits as a function of stop (t̃) and neutralino masses in different decay scenarios leading to the bℓνχ̃01 final state.
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