We report inclusive and exclusive measurements for chi sub(c 1) and chi sub(c 2) production in B decays. We measure Bernoulli(B arrowright chi sub(c 1)X)=(3.03+ or -0.05(stat)+ or -0.24(syst))x10 ...super(-3) and Bernoulli(B arrowright chi sub(c 2)X)=(0.70+ or -0.06(stat)+ or -0.10(syst))x10 super(?3). For the first time, chi sub(c 2) production in exclusive B decays in the modes B super(0) arrowright chi sub(c 2)pi super(-)K super(+) and B super(+) arrowright chi sub(c 2)pi super(+)pi super(-)K super(+) has been observed, along with first evidence for the B super(+) arrowright (ProQuest: Formulae and/or non-USASCII text omitted) decay mode. For chi sub(c 1) production, we report the first observation in the B super(+) arrowright chi sub(c 1)pi super(+)pi super(-)K super(+), B super(0) arrowright (ProQuest: Formulae and/or non-USASCII text omitted) and B super(0) arrowright chi sub(c 1)pi super(0)pi super(-)K super(+) decay modes. Using these decay modes, we observe a difference in the production mechanism of chi sub(c 2) in comparison to chi sub(c 1) in B decays. In addition, we report searches for X(3872) and chi sub(c 1)(2P) in the B super(+) arrowright (chi sub(c 1)pi super(+)pi super(?))K super(+) decay mode. The reported results use 772x10 super(6)BB events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e super(+)e super(-) collider.
Vertex detector for super Belle experiment Kawasaki, T.; Barbero, M.; Friedl, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2006, Volume:
560, Issue:
1
Journal Article
Peer reviewed
Using a high resolution silicon vertex detector and a large number of B meson decays, the Belle experiment has succeeded in measuring time-dependent CP asymmetry with high precision. To continue the ...search for physics beyond the standard model, an upgrade of the KEKB collider to a luminosity of
10
35
–
36
cm
-
2
s
-
1
is proposed. Such a luminosity upgrade will also require an upgraded (“Super”) Belle experiment. Discussions have started on the conceptual design for the silicon vertexing upgrade of this detector. Since the momenta of particles is not high in B factory operating at the
ϒ
(
4
S
)
resonance, it is important to avoid high occupancy while keeping the material budget low. A fast data acquisition system and radiation hardness are also required. In this report, the conceptual design of a vertex detector for the Super Belle experiment is shown. The status of R&D topics is also reported.
We search for the rare radiative decay D super(0)arrowrightgammagamma using a data sample with an integrated luminosity of 832fb super(-1) recorded by the Belle detector at the KEKB e super(+)e ...super(-) asymmetric-energy collider. We find no statistically significant signal and set an upper limit on the branching fraction of scriptB(D super(0)arrowrightgammagamma)<8.5x10 super(-7) at 90% confidence level. This is the most restrictive limit on the decay channel to date.
It is well recognized that acute strenuous exercise is accompanied by an increase in free-radical production and subsequent oxidative stress, in addition to changes in blood antioxidant status. ...Chronic exercise provides protection against exercise-induced oxidative stress by upregulating endogenous antioxidant defense systems. Little is known regarding the protective effect afforded by judo exercise. Therefore, we determined antioxidant and oxidative stress biomarkers at rest and in response to acute exercise in 10 competitive judokas and 10 sedentary subjects after mixed exercise (anaerobic followed by aerobic). The subjects performed a Wingate test, followed by 30 minutes of aerobic exercise performed at 60% of maximal aerobic power. Blood samples were taken, by an intravenous catheter, at rest (R), immediately after the physical exercise (P0), and at 5 (P5), 10 (P10), and 20 (P20) minutes postexercise. The measured parameters included the activity of the antioxidant enzymes superoxide dismutase, glutathione peroxidase, and glutathione reductase, in addition to α-tocopherol, and total antioxidant status. Malondialdehyde was measured as a representation of lipid peroxidation. At rest, the judokas had higher values for all antioxidant and oxidative stress markers as compared to the sedentary subjects (p < 0.05). Plasma concentrations of all parameters except for α-tocopherol increased significantly above resting values for both the judokas and sedentary subjects (p < 0.05) and remained elevated at 20 minutes postexercise. A significant postexercise decrease was observed for α-tocopherol (p < 0.05) at P20 for judokas and at P5 for sedentary subjects. These data indicate that competitive judo athletes have higher endogenous antioxidant protection compared to sedentary subjects. However, both groups of subjects experience an increase in exercise-induced oxidative stress that is not different.
La fracture de fatigue chez le sujet sportif survient sur un os sain et correspond à une pathologie d’inadaptation de l’os à l’effort. Elle résulte d’un déséquilibre entre la capacité d’adaptation de ...l’os et une surcharge mécanique trop importante, inhabituelle, intense et répétitive. Le but de ce travail est de montrer que la scintigraphie osseuse planaire garde encore une place dans l’orientation diagnostique et la classification des fractures de fatigue.
Cas clinique no 1 : jeune fille de 17ans, sportive de haut niveau, a été adressée pour exploration de douleurs des jambes d’allure mécanique suite à un changement du rythme d’entraînement. Le bilan radiologique est sans anomalie. La scintigraphie osseuse au 99mTc-HDP a mis en évidence deux foyers de fracture de fatigue tibiale droite stade I de Zwas et une fracture de fatigue stade II du tibia gauche. Cas clinique no 2 : il s’agit d’un soldat âgé de 21ans, nouvellement recruté. Il a été adressé pour des douleurs intenses de la jambe droite. Le bilan radiologique a retrouvé une réaction périostée en regard du tibia droit. La scintigraphie osseuse au 99mTc-HDP a retrouvé une fracture de fatigue du tibia droit stade IV de Zwas et une fracture de fatigue du calcanéum droit, associées à une périostite du tibia gauche. Cas clinique no 3 : il s’agit d’un soldat âgé de 20ans, nouvellement recruté. Il a été adressé pour des douleurs intenses des deux jambes. Le scanner a retrouvé une fracture du tibia droit. La scintigraphie osseuse au 99mTc-HDP a mis en évidence des fractures de fatigue des diaphyses tibiales, classées stade III à droite et stade I à gauche et deux autres au niveau du pied gauche : le calcanéum et la base du 1er métatarse.
Ce travail rappelle que la scintigraphie osseuse planaire est un examen paraclinique de référence dans le diagnostic des fractures de fatigue. Quatre stades sont classiquement décrits et correspondent aux quatre stades à l’IRM. Ces stades sont utilisés pour définir la gravité de la fracture de fatigue et la durée prévisible de la consolidation osseuse.
The branching fractions of the Υ(1S) inclusive decays into final states with a J/ψ or a ψ(2S) are measured with improved precision to be B(Υ(1S)→J/ψ+anything)=(5.25±0.13(stat)±0.25(syst))×10-4 and ...B(Υ(1S)→ψ(2S)+anything)=(1.23±0.17(stat)±0.11(syst))×10-4. The first search for Υ(1S) decays into XYZ states that decay into a J/ψ or a ψ(2S) plus one or two charged tracks yields no significant signals for XYZ states in any of the examined decay modes, and upper limits on their production rates in Υ(1S) inclusive decays are determined.
We study bottomonium production in association with an Formula omitted meson in Formula omitted annihilations near the Formula omitted, at a centre-of-mass energy of Formula omitted GeV. The results ...are based on the 121.4 fb Formula omitted data sample collected by the Belle experiment at the asymmetric-energy KEKB collider. Only the Formula omitted meson is reconstructed and the missing-mass spectrum of Formula omitted candidates is investigated. We observe the Formula omitted process and find evidence for the Formula omitted process, while no significant signals of Formula omitted, Formula omitted, nor Formula omitted are found. Cross sections for the studied processes are reported.
The aim of this study was to evaluate the effects of a hypertrophic training program during Ramadan on body composition and selected metabolic markers in trained bodybuilders. Sixteen male ...recreational bodybuilders (9 Ramadan fasters and 7 nonfasters) participated in the study. All visited the laboratory 2 d before the start of Ramadan (Bef-R) and on the 29th day of Ramadan (End-R). In the morning of each session, subjects underwent anthropometric measurement, completed a dietary questionnaire, and provided fasting blood and urine samples. Body mass and body-mass index in nonfasters increased by 2.4% (p = .05 and p = .04, respectively) from Bef-R to End-R but remained unchanged in fasters over the period of the investigation. Fasters experienced an increase in the following parameters from Bef-R to End-R: urine specific gravity (1%, p = .022) and serum concentrations of urea (5%, p = .008), creatinine (5%, p = .007), uric acid (17%, p < .001), sodium (2%, p = .019), potassium (6%, p = .006), chloride (2%, p = .028), and high-density lipoprotein cholesterol (10%, p = .005). However, only serum creatinine and low-density lipoprotein cholesterol increased in nonfasters (3%, p <.001 and 14%, p = .007, respectively) during the same period. Creatinine clearance values of fasters decreased by 3% (p = .03) from Bef-R to End-R. Continuance of hypertrophic training through Ramadan had no effect on body mass and body composition of bodybuilders, but a state of dehydration and reduced renal function were apparent, perhaps because of the restricted opportunity for fluid intake imposed by the study design.
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