Abstract
Inclusive branching ratios involving b → τ transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b → τ-ν̄τX) and the semi-inclusive branching ratio BR(b → τ-ν̄τD*±X) are measured to be (2.43 ± 0.20 ± 0.25)% and (0.88 ± 0.31 ± 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions BR(B- → τ-v̄τ) and BR(b → sνν̄) are set to 8.3 × 10-4 and 6.4 × 10-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c2)-1 to be set on the tan β/mH± ratio, in the framework of type-II two-Higgs-doublet models.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 213-227 |
| Number of pages | 15 |
| Journal | European Physical Journal C |
| Volume | 19 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2001 |
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)
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In: European Physical Journal C, Vol. 19, No. 2, 2001, p. 213-227.
Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Measurements of BR(b → τ-ν̄τX) and BR(b → τ-ν̄τD*±X) and upper limits on BR(B- → τ-ν̄τ) and BR(b → sνν̄)
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AU - Renk, B.
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AU - Sander, H. G.
AU - Wachsmuth, H.
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AU - Combley, F.
AU - Lehto, M.
AU - Thompson, L. F.
AU - Affholderbach, K.
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AU - Brandt, S.
AU - Grupen, C.
AU - Misiejuk, A.
AU - Prange, G.
AU - Sieler, U.
AU - Giannini, G.
AU - Gobbo, B.
AU - Rothberg, J.
AU - Wasserbaech, S.
AU - Armstrong, S. R.
AU - Cranmer, K.
AU - Elmer, P.
AU - Ferguson, D. P.S.
AU - Gao, Y.
AU - González, S.
AU - Hayes, O. J.
AU - Hu, H.
AU - Jin, S.
AU - Kile, J.
AU - McNamara, P. A.
AU - Nielsen, J.
AU - Orejudos, W.
AU - Pan, Y. B.
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AU - Scott, I. J.
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N1 - Funding Information: There are limited repeated dose toxicity data on ethyl butyrate. Read-across material propyl propionate (CAS # 106-36-5; see Section VI) has sufficient data to support the repeated dose toxicity endpoint. In an OECD 422, EPA OPPTS 870.3650, and GLP-compliant study, 12 Crj:CD(SD)IGS rats/sex/dose were exposed to propyl propionate through whole-body inhalation at doses of 0, 50, 250, and 500 ppm (using the standard minute volume and body weights equivalent to 0, 61.6, 311, and 616 mg/kg/day, respectively). Treatment duration was 38 days in males and 48 days in females. No treatment-related mortality or clinical signs of toxicity were reported throughout the study. In addition, no treatment-related adverse effects were reported for organ weights, hematology, clinical chemistry, or urinalysis at any dose level. In females, body weight and food consumption were significantly lower in mid- and high-dose groups during the study. However, for both parameters, the decreases were <8% and therefore not considered to be of toxicological significance. Clinical chemistry analysis revealed a significant increase in AST levels in males of the high-dose group, but no correlated histopathological or functional changes in the liver were reported. Tension lipidosis, a pale focus in the right medial lobe of the liver, was observed in females of the high-dose group, but this was not considered to be a treatment-related adverse effect, as it is a commonly occurring lesion in rats. At all doses, several local respiratory effects were also reported. Since no systemic toxicity was reported at any dose, the NOAEL for this study was considered to be 500 ppm (616 mg/kg/day) (ECHA, 2018).There are no reproductive toxicity data on ethyl butyrate. Read-across material propyl propionate (CAS # 106-36-5; see Section VI) has sufficient reproductive toxicity data that can be used to support the reproductive toxicity endpoint. In an OECD 422/GLP study, groups of 12 Crl:CD(SD) rats/sex were administered test material n-propyl propionate via whole-body exposure at target concentrations of 0, 50, 250, and 500 ppm (equivalent to 0, 62, 308, and 616 mg/kg/day, respectively, as per standard minute volume and bodyweight parameters for Sprague Dawley rats) for 6 h per day, 7 days per week. Females were exposed for 2 weeks prior to breeding, through breeding (approximately 2 weeks), and continued through gestation day 20; the females were then subjected to gross necropsy on postpartum day 5. Males were exposed to the test material 2 weeks prior to breeding and continued through breeding (approximately 2 weeks) before being subjected to gross necropsy (day 38). In addition to systemic toxicity parameters, reproductive toxicity parameters and neurological function were also assessed. There were no treatment-related adverse effects on reproductive performance or survival and growth of pups. The NOAEL for fertility effects and the development of pups was considered to be 500 ppm or 616 mg/kg/day, the highest dose tested (ECHA, 2018). Therefore, the ethyl butyrate MOE for the reproductive toxicity endpoint can be calculated by dividing the propyl propionate NOAEL in mg/kg/day by the total systemic exposure to ethyl butyrate, 616/0.0049, or 125714.
PY - 2001
Y1 - 2001
N2 - Inclusive branching ratios involving b → τ transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b → τ-ν̄τX) and the semi-inclusive branching ratio BR(b → τ-ν̄τD*±X) are measured to be (2.43 ± 0.20 ± 0.25)% and (0.88 ± 0.31 ± 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions BR(B- → τ-v̄τ) and BR(b → sνν̄) are set to 8.3 × 10-4 and 6.4 × 10-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c2)-1 to be set on the tan β/mH± ratio, in the framework of type-II two-Higgs-doublet models.
AB - Inclusive branching ratios involving b → τ transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b → τ-ν̄τX) and the semi-inclusive branching ratio BR(b → τ-ν̄τD*±X) are measured to be (2.43 ± 0.20 ± 0.25)% and (0.88 ± 0.31 ± 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions BR(B- → τ-v̄τ) and BR(b → sνν̄) are set to 8.3 × 10-4 and 6.4 × 10-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c2)-1 to be set on the tan β/mH± ratio, in the framework of type-II two-Higgs-doublet models.
UR - http://www.scopus.com/inward/record.url?scp=0001229513&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001229513&partnerID=8YFLogxK
U2 - 10.1007/s100520100612
DO - 10.1007/s100520100612
M3 - Article
AN - SCOPUS:0001229513
SN - 1434-6044
VL - 19
SP - 213
EP - 227
JO - European Physical Journal C
JF - European Physical Journal C
IS - 2
ER -