Search for the B[sub C] Meson in Hadronic Z[sup 0] Decays Using the OPAL Detector at LEP. PDF Download
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Languages : en
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A search for decays of the B[sub c] meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z[sup 0] peak at LEP. The decay channels B[sub c][sup+][r-arrow] J/[psi][pi][sup+], B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] and B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu] were investigated, where[ell] denotes an electron or a muon. Two candidates are observed in the mode B[sub c][sup+][r-arrow] J/[psi][pi][sup+], with an estimated background of (0.63[+-] 0.20) events. The weighted mean of the masses of the two candidates is (6.32[+-] 0.06) GeV/c[sup 2], which is consistent with the predicted mass of the B[sub c] meson. One candidate event is observed in the mode B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu], with an estimated background of (0.82[+-] 0.19) events. No candidate events are observed in the B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] decay mode, with an estimated background of (1.10[+-] 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
![Search for the B[sub C] Meson in Hadronic Z[sup 0] Decays Using the OPAL Detector at LEP. PDF](https://books.google.com/books/content/images/frontcover/h3fyjwEACAAJ?fife=w80-h100)
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A search for decays of the B[sub c] meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z[sup 0] peak at LEP. The decay channels B[sub c][sup+][r-arrow] J/[psi][pi][sup+], B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] and B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu] were investigated, where[ell] denotes an electron or a muon. Two candidates are observed in the mode B[sub c][sup+][r-arrow] J/[psi][pi][sup+], with an estimated background of (0.63[+-] 0.20) events. The weighted mean of the masses of the two candidates is (6.32[+-] 0.06) GeV/c[sup 2], which is consistent with the predicted mass of the B[sub c] meson. One candidate event is observed in the mode B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu], with an estimated background of (0.82[+-] 0.19) events. No candidate events are observed in the B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] decay mode, with an estimated background of (1.10[+-] 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
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Languages : en
Pages : 145
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A search for decays of the B{sub c} meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z° peak at LEP. The decay channels B{sub c} → J/??+, B{sub c}+ → J/?a1+ and B{sub c}+ → J/?l+? were investigated, where l denotes an electron or a muon. Two candidates are observed in the mode B{sub c}+ → J/??+, with an estimated background of (0.63 ± 0.20) events. The weighted mean of the masses of the two candidates is (6.32 ± 0.06) GeV/c2, which is consistent with the predicted mass of the B{sub c} meson. One candidate event is observed in the mode B{sub c}+ → J/?l+?, with an estimated background of (0.82 ± 0.19) events. No candidate events are observed in the B{sub c}+ → J/?a1+ decay mode, with an estimated background of (1.10 ± 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
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Languages : en
Pages : 149
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A search for decays of the Bc meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z0 peak at LEP. The decay channels B$+\atop{c}$ 2!J/[Psi][pi]+, B$+\atop{c}$ 2!J/[Psi]a1 and B$+\atop{c}$ 2!J/[Psi]l+v were investigated, where l denotes an electron or a muon. Two candidates are observed in the mode B$+\atop{c}$ 2!J/[Psi][pi]+, with an estimated background of (0.63 ± 0.20) events. The weighted mean of the masses of the two candidates is (6.32 ± 0.06) GeV/c2, which is consistent with the predicted mass of the Bc meson. One candidate event is observed in the mode B$+\atop{c}$ 2!J/[Psi]l+v, with an estimated background of (0.82 ± 0.19) events. No candidate events are observed in the B$+\atop{c}$ 2!J/[Psi]a$+\atop{1}$ decay mode, with an estimated background of (1.10 ± 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
Author: Pedro Augusto Amaral
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Category : Beta decay
Languages : en
Pages : 296
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Author: Dana Lindemann
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Category :
Languages : en
Pages :
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"This thesis presents the searches for two rare B meson decays: the radiative leptonic decay B+ -> l+ nu gamma (l = e, mu) and the flavor-changing neutral current B -> K(*) nu nubar. These searches use the full dataset collected by the BaBar experiment, which corresponds to almost 500 million BB pairs. After fully reconstructing the hadronic decay of one of the B mesons in Upsilon(4S) -> BB decays, evidence of B+ -> l+ nu gamma or B -> K(*) nu nubar is looked for in the rest of the event. No significant evidence of either signal decay is observed. Model-independent branching-fraction upper limits are set at BR(B ->e nu gamma)17 x10 {-6}, BR(B -mu nu gamma)24 x10 {-6}, and BR(B -l nu gamma)15.6 x10 {-6}, all at the 90% confidence level. These are currently the most stringent published upper limits for B+ - l+ nu gamma. In addition, branching-fraction upper limits are set at BR(B -> K+ nu nubar)3.7 x10 {-5}, BR(B - K0 nu nubar)8.0 x10 {-5}, BR(B - K*+ nu nubar)11.5 x10 {-5}, and BR(B - K*0 nu nubar)9.2 x10 {-5}, all at the 90% confidence level. For additional sensitivity to New Physics contributions, partial B - K(*) nu nubar branching-fraction upper limits are also determined over the full kinematic range." --
Author: Nicholas L. Blount
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Category : B mesons
Languages : en
Pages : 236
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Category :
Languages : en
Pages : 5
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Based on a sample of approximately 500,000 hadronic Z° decays accumulated between 1993 and 1998, the SLD experiment has set limits on 24 fully charged two-body and quasi two-body exclusive charmless hadronic decays of B, B°, and B{sub s}° mesons. The precise tracking capabilities of the SLD detector provided for the efficient reduction of combinatoric backgrounds, yielding the most precise available limits for ten of these modes.
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Languages : en
Pages :
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We present several searches for charmless hadronic two-body and three-body decays of B mesons from electron-positron annihilation data collected by the BABAR detector near the[Upsilon](4S) resonance. We report the preliminary branching fractions[Beta](B[sup 0][yields][pi][sup+][pi][sup -])= (4.1[+-] 1.0[+-] 0.7) x 10[sup -6], [Beta](B[sup 0][yields] K[sup+][pi][sup -])= (16.7[+-] 1.6[+-] 1.3) x 10[sup -6], [Beta](B[sup 0][yields][rho][sup -+][pi][sup -+])= (49[+-] 13[sub -5][sup+6]) x 10[sup -6], [Beta](B[sup+][yields][eta]' K[sup+])= (62[+-] 18[+-] 8) x 10[sup -6], and present upper limits for nine other decays.
Author: G. ABBIENDI
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Category :
Languages : en
Pages : 0
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Author: Douglas Corey Reher
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ISBN:
Category :
Languages : en
Pages : 316
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