Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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° Decays Using the OPAL Detector at LEP.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 145
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 145
Book Description
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.
Search for the Bc Meson in Hadronic Z0 Decays Using the OPAL Detector at LEP.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
Book Description
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.
Semileptonic B Decays to Narrow Orbitally-excited Charm Mesons Using the OPAL Detector at LEP
Author: Pedro Augusto Amaral
Publisher:
ISBN:
Category : Beta decay
Languages : en
Pages : 296
Book Description
Publisher:
ISBN:
Category : Beta decay
Languages : en
Pages : 296
Book Description
The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector
Author: Dana Lindemann
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"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." --
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"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." --
A Search for Direct and Radiative Decays of the B0 Meson to Invisible Final State Using a Hadronic Tagging Method at the BABAR Detector
Author: Nicholas L. Blount
Publisher:
ISBN:
Category : B mesons
Languages : en
Pages : 236
Book Description
Publisher:
ISBN:
Category : B mesons
Languages : en
Pages : 236
Book Description
Search for Charmless Hadronic Decays of B Mesons with the SLD Detector
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
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.
Charmless Hadronic B Decays at BABAR.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
DECAY-mode independent searches for new scalar bosons with the OPAL detector at LEP
Author: G. ABBIENDI
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
A Search for Fully Hadronic Decay Modes of the B( -c) Meson at CDF
Author: Douglas Corey Reher
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
Book Description