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CERN Document Server 找到 2,051 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.91 秒. 
1.
Measurement of $K^{0} _{\mu 3}$ form factors / NA48 Collaboration
This paper reports on a new high precision measurement of the form factors of the $K_{L}\rightarrow~\pi^{\pm}~\mu^{\mp}~\nu_{\mu}$} decay. The data sample of about $2.3 \times 10^{6}$ events was recorded in 1999 by the NA48 experiment at CERN. [...]
hep-ex/0703002; CERN-PH-EP-2006-033; CERN-PH-EP-2006-033.- Geneva : CERN, 2007 - 21 p. - Published in : Phys. Lett. B 647 (2007) 341-350 Fulltext: arXiv:hep-ex_0703002 - PDF; 0703002 - PDF; phep-2006-033 - PDF; External link: hep-ex/0703002 PDF
2.
Precise measurements of the $K_{S}\to\gamma\gamma$ and $K_{L}\to\gamma\gamma$ decay rates / NA48 Collaboration
The $K_{S} \to \gamma\gamma$ decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR($K_{S}) \to \gamma\gamma = (2.78 \pm 0.06_{stat} \pm 0.04_{syst}) \times 10^{-6}$, obtained from 7461$\pm$172 $K_{S} \to \gamma\gamma$ events, is significantly higher than the $O(p^{4})$ prediction of Chiral Perturbation Theory. [...]
hep-ex/0210053; CERN-EP-2002-074; CERN-EP-2002-074.- Geneva : CERN, 2003 - 10 p. - Published in : Phys. Lett. B 551 (2003) 7-15 Fulltext: ep-2002-074 - PDF; arXiv:hep-ex_0210053 - PDF; S0370269302029556 - XML; External link: Preprint - Please contact the library if you need to access this document.
3.
Measurements of charged kaon semileptonic decay branching fractions $K^{\pm} \to \pi^{0} \mu^{\pm} \nu$ and $K^{\pm} \to \pi^{0} e^{\pm} \nu$ and their ratio / NA48/2 Collaboration
Measured ratios of decay rates for Ke3/K2\pi, K\mu3/K2\pi and K\mu3/Ke3 are presented. These measurements are based on K^+- decays collected in a dedicated run in 2003 by the NA48/2 experiment at CERN. [...]
hep-ex/0702015; CERN-PH-EP-2006-039; CERN-PH-EP-2006-039.- Geneva : CERN, 2007 - 20 p. Fulltext: arXiv:hep-ex_0702015 - PDF; phep-2006-039 - PDF; 0702015 - PDF; External link: hep-ex/0702015 PDF
4.
First observation of the $K_{S}\to \pi^{0}\gamma\gamma$ decay / NA48 Collaboration
Using the NA48 detector at the CERN SPS, 31 $K_{S}\to \pi^{0}\gamma\gamma$ candidates with an estimated background of $13.7 \pm 3.2$ events have been observed. This first observation leads to a branching ratio of $BR(K_{S}\to \pi^{0}\gamma\gamma)_{z>0.2} = (4.9 \pm 1.6_{stat} \pm 0.9_{syst}) \times 10^{-8}$ in agreement with Chiral Perturbation theory predictions..
hep-ex/0309022; CERN-EP-2003-052; CERN-EP-2003-052.- Geneva : CERN, 2004 - 10 p. - Published in : Phys. Lett. B 578 (2004) 276-284 Fulltext: arXiv:hep-ex_0309022 - PDF; ep-2003-052 - PDF; S0370269303016782 - XML; External link: Preprint - Please contact the library if you need to access this document.
5.
Measurement of the quadratic slope parameter in the $K_{L}\rightarrow 3\pi^{0}$ decay Dalitz plot / NA48 Collaboration
A value of $(-6.1\pm 0.9_{stat}\pm 0.5_{syst}) \times 10^{-3}$ is obtained for the quadratic slope parameter $h$ in the $K_{L}\rightarrow 3\pi^{0}$ decay Dalitz plot at the NA48 experiment at the CERN SPS. The result is based on $14.7\times 10^{6}$ fully reconstructed $K_{L}\rightarrow 3\pi^{0} \rightarrow 6\gamma$ decays. [...]
hep-ex/0106075; CERN-EP-2001-041; CERN-EP-2001-041.- Geneva : CERN, 2001 - 13 p. - Published in : Phys. Lett. B 515 (2001) 261-268 Fulltext: S0370269301008619 - XML; ep-2001-041 - PDF; arXiv:hep-ex_0106075 - PDF; External link: Preprint - Please contact the library if you need to access this document.
6.
Measurement of the branching ratios of the decays $\Xi^{0}\rightarrow \sigma^{+} e^{-} \overline{\nu}_{e}$ and $\overline{\Xi^{0}}\rightarrow \overline{\sigma^{+}} e^{+} \nu_{e}$ / NA48/1 Collaboration
From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 $\Xi^{0}\rightarrow \Sigma^{+} e^{-} \overline{\nu}_{e}$ candidates (with the subsequent $\Sigma^{+} \rightarrow p \pi^{0}$ decay) and 555 $\overline{\Xi^{0}}\rightarrow \overline{\Sigma^{+}} e^{+} \nu_{e}$ candidates with background contamination of $215 \pm 44$ and $136 \pm 8$ events, respectively. From these samples, the branching ratios BR($\Xi^{0}\rightarrow \Sigma^{+} e^{-} \overline{\nu}_{e})=(2.51 \pm0.03_{\mathrm{stat}}\pm 0.09_{\mathrm{syst}})\times10^{-4}$ and BR($\overline{\Xi^{0}}\rightarrow \overline{\Sigma^{+}} e^{+} \nu_{e})= (2.55 \pm 0.12_{\mathrm{stat}}\pm{0.10}_{\mathrm{syst}}) \times 10^{-4}$ were measured allowing the determination of the CKM matrix element $|V_{\mathrm{us}}| = 0.209^{+0.023}_{-0.028}$. [...]
hep-ex/0612043; CERN-PH-EP-2006-032; CERN-PH-EP-2006-032.- Geneva : CERN, 2007 - 16 p. - Published in : Phys. Lett. B 645 (2007) 36-46 Fulltext: S0370269306015541 - XML; 0612043 - PDF; arXiv:hep-ex_0612043 - PDF; phep-2006-032 - PDF; External link: Preprint
7.
Measurement of the ratio $\Gamma(K_{L} \rightarrow \pi^{+}\pi^{-}) / \Gamma(K_{L} \rightarrow \pi^{\pm}e^{\mp}\nu)$ and extraction of the CP violation parameter $|\eta_{+-}|$ / NA48 Collaboration
We present a measurement of the ratio of the decay rates $\Gamma (K_L \rightarrow\pi^+\pi^-) / \Gamma(K_L \rightarrow\pi^{\pm}e^{\mp}\nu)$, denoted as $\Gamma_{K2\pi}/\Gamma_{Ke3}$. The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. [...]
hep-ex/0611052; CERN-PH-EP-2006-034; CERN-PH-EP-2006-034.- Geneva : CERN, 2007 - 20 p. - Published in : Phys. Lett. B 645 (2007) 26-35 Fulltext: 0611052 - PDF; phep-2006-034 - PDF; S0370269306015474 - XML; arXiv:hep-ex_0611052 - PDF; External link: Preprint
8.
Measurement of the branching ratio and form factors for the decay $K_{L} \to \pi^{\pm}\pi^{0} e^{\mp}\nu_{e}(\bar{\nu}_{e})$ / NA48 Collaboration
The $K_{L} \to \pi^{\pm}\pi^{0}e^{\mp}\nu_{e}(\bar{\nu_{e}})$ decay was investigated with the NA48 detector at CERN SPS using a beam of long-lived neutral kaons. The branching ratio $Br(K_{L} \to \pi^{\pm}\pi^{0}e^{\mp}\nu_{e}(\bar{\nu_{e}})) = 5.21 \pm 0.07_{stat} \pm 0.09_{syst}) \times 10^{-5}$ was fixed from a sample of 5464 events with 62 background events. [...]
hep-ex/0405010; CERN-PH-EP-2004-013; CERN-PH-EP-2004-013.- Geneva : CERN, 2004 - 12 p. - Published in : Phys. Lett. B 595 (2004) 75-85 Fulltext: S0370269304007737 - XML; phep-2004-013 - PDF; arXiv:hep-ex_0405010 - PDF; External link: Preprint - Please contact the library if you need to access this document.
9.
Observation of the rare decays $K_{S} \to \pi^{0} \mu^{+} \mu^{-}$ / NA48 Collaboration
A search for the decay $K_{S} \to \pi^{0} \mu^{+} \mu^{-}$ has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high intensity $K_{S}$ beam. [...]
hep-ex/0409011; CERN-PH-EP-2004-025; CERN-PH-EP-2004-025.- Geneva : CERN, 2004 - 19 p. - Published in : Phys. Lett. B 599 (2004) 197-211 Fulltext: S037026930401247X - XML; phep-2004-025 - PDF; 0409011 - PDF; arXiv:hep-ex_0409011 - PDF; External link: Preprint - Please contact the library if you need to access this document.
10.
First observation and branching fraction and decay parameter measurements of the weak radiative decay $\Xi^0 \to \Lambda e^{+}e^{-}$ / NA48 Collaboration
The weak radiative decay $\Xi^0 \rightarrow \Lambda e^{+} e^{-}$ has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of $15 \pm 5$ events. [...]
hep-ex/0703023; CERN-PH-EP-2007-004; CERN-PH-EP-2007-004.- Geneva : CERN, 2007 - 20 p. - Published in : Phys. Lett. B 650 (2007) 1-8 Fulltext: arXiv:hep-ex_0703023 - PDF; phep-2007-004 - PDF; 0703023 - PDF; External link: hep-ex/0703023 PDF

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