Neutrino-induced coherent charged pion production on nuclei, \(\stackrel{(-)}{\nu}_\mu A\to\mu^\pm\pi^\mp A\) is a rare, inelastic interaction in which a small squared four-momentum \(| t|\) is ...transferred to the recoil nucleus leaving it intact in the reaction. In the scintillator tracker of MINERvA, we remove events with evidence of particles from nuclear breakup and reconstruct \(| t|\) from the final state pion and muon. We select low \(| t|\) events to isolate a sample rich in coherent candidates. By selecting low \(| t|\) events we produce a model-independent measurement of the differential cross section for coherent scattering of neutrinos and anti-neutrinos on carbon. We find poor agreement with the predicted kinematics in neutrino generators used by current oscillation experiments.
The effect of 3,3',5'-triiodothyronine (rT3) and 3,5,3'-triiodothyronine (T3) on O2 consumption in 1-day-old chickens was studied. The birds were divided into five groups, each of six chickens: (1) ...control--without injection; (2) control--injected with 100 microliters of solvent (0.01 N NaOH in saline); (3) injected with 10 micrograms rT3/chicken; (4) injected with 0.5 micrograms T3/chicken; and (5) injected with 10 micrograms rT3 + 0.5 microgram T3/chicken. O2 consumption was measured using a Kipp & Zonen diaferometer at neutral temperature (30 degrees) 0, 1, 2, 3, and 4 hr after injection of hormones. Corresponding groups of other chickens served only for blood collection. rT3 and T3 were measured by radioimmunoassay. Reverse T3 decreased O2 consumption by 10.87%. Contrary to this, T3 increased O2 consumption by 29.41%. Reverse T3, injected together with T3, interacted with the hypermetabolic effect of T3 up to 2 hr after injection; then, O2 consumption started to increase, and was about 16.7% higher compared with the basal level 3 hr after injection. The blood plasma level of rT3 increased about 29-fold at the first hour after injection, without changes in the basal level of T3. Administration of T3 increased its level 6-fold 2 hr after injection, which was accompanied by a gradual decrease in the basal level of rT3 (3.7-fold) 4 hr after injection. Administration of rT3 + T3 increased the rT3 level 30-fold at 2 hr and the T3 level 1.7-fold at the first hour after injection. Thus, rT3 acts hypometabolically and interacts with the hypermetabolic effect of T3; administration of T3 lowered the basal level of rT3; and the plasma level of T3 did not change after administration of rT3.
The average ital b-hadron lifetime has been measured using a high statistics sample of ital Br arrowital J/psi ital X decays recorded with the Collider Detector at Fermilab. The decay vertices of ...5344 inclusive ital J/psir arrowmusup +musup minus candidates have been reconstructed using information from a silicon vertex detector. The measured ital B lifetime, which is the average over all ital b hadrons produced in ital pbar p collisions at radicalital s =1.8 TeV weighted by their branching ratios into ital J/psi, is 1.46plus minus0.06(stat)plus minus0.06(syst) ps.
We report the full reconstruction of chisub ital c mesons through the decay chain chisub ital cr arrowital J/psi gamma, ital J/psir arrowmusup +musup minus, using data obtained at the Collider ...Detector at Fermilab in 2.6plus minus0.2 pbsup minus1 of ital bar pp collisions at radicalital s =1.8 TeV. This exclusive chisub ital c sample is used to measure the chisub ital c-meson production cross section times branching fractions. We obtain sigmatimesital B=3.2plus minus0.4(stat)sub minus1.1sup +1.2(syst) nb for chisub ital c mesons decaying to ital J/psi with ital psub ital Tgt6.0 GeV/ital c and pseudorapidity vert baretavert barlt0.5. From this and the inclusive ital J/psi cross section we calculate the inclusive ital b-quark cross section to be 12.0plus minus4.5 mub for ital psub ital Tsup ital bgt8.5 GeV/ital c and vert barital ysup ital bvert barlt1.
The dijet invariant mass distribution has been measured in the region between 140 and 1000 GeV/ital csup 2, in 1.8 TeV ital p bar p collisions. Data collected with the Collider Detector at Fermilab ...show agreement with QCD calculations. A limit on quark compositeness of Lambdasub ital cgt1.3 TeV is obtained. Axigluons with masses between 240 and 640 GeV/ital csup 2 are excluded at 95% C.L. if we assume ten open decay channels. Model-independent limits on the production of heavy particles decaying into two jets are also presented.
We present a measurement of the ital b-quark cross section in 1.8 TeV ital p-ital bar p collisions recorded with the Collider Detector at Fermilab using muonic ital b-quark decays. In the central ...rapidity region (vert barital ysup ital bvert barlt1.0), the cross section is 295plus minus21plus minus75 nb (59plus minus14plus minus15 nb) for ital psub ital Tsup ital bgt21 GeV/ital c (29 GeV/ital c). Comparisons are made to previous measurements and next-to-leading order QCD calculations.
This Letter reports the observation and mass measurement of fully reconstructed ital Bsub ital ssup 0 mesons through the decay chain ital Bsub ital ssup 0r arrowital J/psi psi, ital J/psir arrowmusup ...+musup minus, phir arrowital Ksup +ital Kminus using data obtained at the Collider Detector at Fermilab in ital bar pp collisions at radicalital s =1.8 TeV. A signal of 14.0plus minus4.7 events is observed. Comparison of the ital Bsub ital ssup 0 signal with the kinematically similar decays ital Bsup +r arrowital J/psi ital Ksup + and ital Bsup 0r arrowital J/psi Ksup *(892)sup 0 is presented. The mass of the ital Bsub ital ssup 0 meson is determined to be 5383.3plus minus4.5(stat)plus minus5.0(syst) MeV/ital csup 2.
PDF