Scientific Commons: G. M. Pierazzini

A 40 MHz-pipelined trigger for K�P2� � decays for the CERN NA48 experiment� (2007)

G. Fischer, C. Avanzini, G. D. Barr, P. Calafiura, M. Cirilli, F. Costantini, ...

The “neutral ” trigger system for the selection of K�P2��P4 � decays of the NA48 CP-violation experiment is described. The trigger system has been implemented in a 40 MHz “dead-time...

Search for direct CP violating charge asymmetries in $K^\pm\to\pi^\pm\pi^+\pi^-$ and $K^\pm\to\pi^\pm\pi^0\pi^0$ decays (2007)

Batley, J Richard, Culling, A J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Slater, M W, ...

A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes $A_g=(g^+-g^-)/(g^++g^-)$ in $K^\pm\to\pi^\pm\pi^+\pi^-$ and $K^\pm\to\pi^\pm\pi^0\pi^0$ decays by the...

Measurements of the $\Xi^0$ Lifetime and the $\overline{\Xi^0}/\Xi^0$ Flux Ratio in a Neutral Beam (2007)

Batley, J Richard, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Patel, M, Slater, M W, ...

A total of 235 698 Xi0 -> Lambda pi0 and 21 527 anti-Xi0 -> anti-Lambda pi0 decays were selected from data obtained by the NA48/1 experiment at CERN. From this sample, the lifetime of the Xi0 hyperon...

The Beam and Detector for the NA48 Neutral Kaon CP Violation Experiment at CERN (2007)

Fanti, V, Lai, A, Marras, D, Musa, L, Nappi, A, Batley, J Richard, ...

The Beam and Detector, used for the NA48 experiment, devoted to the measurement of $Re(\epsilon^{\prime}/\epsilon)$, and for the NA48/1 experiment on rare K_S and neutral hyperon decays, are...

Measurement of $K^{0}_{\mu3}$ form factors (2007)

Bevan, A, Anzivino, G, Arcidiacono, R, Barr, G, Becker, H G, Bernhard, R, ...

This paper reports on a new high precision measurement of the form factors of the K_{L}\to \pi^{\pm} \mu^{\mp} \nu_{\mu} decay. The data sample of about 2.3$\times 10^{6}$ events was recorded in 1999...

First observation and branching fraction and decay parameter measurements of the weak radiative decay $\Xi^0 \to \Lambda e^{+}e^{-}$ (2007)

Batley, J Richard, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Patel, M, Slater, M W, ...

The weak radiative decay $Xi^0 -> \Lambda e^+ e^- $ has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of $15pm 5$ events. We determine...

Measurement of the Dalitz plot slopes of the $K^\pm\to\pi^\pm\pi^+\pi^-$ decay (2007)

Batley, J Richard, Culling, A J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Slater, M W, ...

The distribution of the $K^\pm\to\pi^\pm\pi^+\pi^-$ decays in the Dalitz plot has been measured by the NA48/2 experiment at the CERN SPS with a sample of $4.71\times 10^8$ fully reconstructed events....

Measurements of Charged Kaon Semileptonic Decay Branching Fractions $K^{+-} \to \pi^0 \mu^{+-} \nu$ and $K^{+-} \to \pi^0 e^{+-} \nu$ and Their Ratio (2007)

Batley, J R, Anzivino, Giuseppina, Arcidiacono, R, Baldini, W, Balev, S, Behler, M, ...

Measured ratios of decay rates for $\rkekp$, $\rkmukp$ and $\rkmuke$ are presented. These measurements are based on $K^\pm$ decays collected in a dedicated run in 2003 by the NA48/2 experiment at...

The beam and detector for the NA48 neutral kaon CP violation experiment at CERN (2007)

Fanti, V., Lai, A., Marras, D., Musa, L., Nappi, A., Batley, R., ...

The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(ε′/ε), and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described.

The beam and detector for the NA48 neutral kaon CP violation experiment at CERN (2007)

Fanti, V., Lai, A., Marras, D., Musa, L., Nappi, A., Batley, R., ...

The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(ε′/ε), and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described.

The beam and detector for the NA48 neutral kaon CP violation experiment at CERN (2007)

Fanti, V., Lai, A., Marras, D., Musa, L., Nappi, A., Batley, R., ...

The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(ε′/ε), and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described.

Measurements of Charged Kaon Semileptonic Decays Branching Fractions $K\pm \to \pi^{0}\mu\pm \nu$ and $K\pm \to \pi^{0} e\pm \nu$ and Their Ratio (2006)

Batley, J R, Sozzi, M, Pierazzini, G M, Michetti, A, Mannell, I, Lamanna, G, ...

Measured ratios of decay rates for $\rkekp$, $\rkmukp$ and $\rkmuke$ are presented. These measurements are based on $K^\pm$ decays collected in a dedicated run in 2003 by the NA48/2 experiment at...

Measurement of the branching ratios of the decays $\Xi^0 \to \sigma^+ e^- \bar{\nu}_e$ and $anti-\Xi^0 \to anti-\sigma^+ e+ \nu_e$ (2006)

Batley, J R, Anzivino, G, Arcidiacono, R, Baldini, W, Behler, M, Biino, C, ...

From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Xi0 --> Sigma+ e- nubar candidates (with the subsequent Sigma+ --> p pi0 decay) and 555 anti-Xi0 --> anti-Sigma+ e+ nu...

Measurement of the Ratio Gamma $(KL \to \pi^{+} \pi^{-})/Gamma(KL \to \pi e \nu)$ and Extraction of the CP Violation Parameter $|\eta+-|$ (2006)

Lai, A, Anzivino, G, Arcidiacono, R, Barr, G, Becker, H G, Bertanza, L, ...

We present a measurement of the ratio of the decay rates Gamma(KL -> pi+ pi-)/Gamma(KL -> pi e nu), denoted as Gamma(K2pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in...

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 $|\eta_{+-}|$ (2006)

Lai, A, Anzivino, Giuseppina, Arcidiacono, R, Barr, G, Becker, H G, Bertanza, L, ...

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...

Measurement of $k^0 _{\mu 3}$ form factors (2006)

Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, Hay, B, ...

This paper reports on a new high precision measurement of the form factors of the $\rm K_{L}\rightarrow~\pi^{\pm}~\mu^{\mp}~\nu_{\mu}$} decay. The data sample of about 2.3X10^6 events was recorded in...

Measurement of the branching ratios of the decays $\Xi^{0}\rightarrow \sigma^{+} e^{-} \overline{\nu}_{e}$ and $\overline{\Xi^{0}}\rightarrow \overline{\sigma^{+}} e^{+} \nu_{e}$ (2006)

Batley, J Richard, Anzivino, Giuseppina, Arcidiacono, R, Baldini, W, Behler, M, Biino, C, ...

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 $\Sigma^{+} \rightarrow p \pi^{0}$...

Determination of the branching ratios $\gamma(K_L \rightarrow 3\pi^0) / \gamma(K_L \rightarrow \pi^+\pi^-\pi^0)$ and $\gamma(K_L \rightarrow 3\pi^0) / \gamma(K_L \rightarrow e \pi e \nu)/$ (2006)

Kreutz, A., Holder, M., Rost, M., Werthenbach, R., Peach, K.J., Bluemer, H., ...

Search for direct CP-violation in $K^{\pm}\to \pi^{\pm}\pi^{0}\pi^{0}$ decays (2006)

Batley, J Richard, Culling, A J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Slater, M W, ...

A search for direct CP-violation in K+- --> pi+-pi0pi0 decays based on 47.14 million events has been performed by the NA48/2 experiment at the CERN SPS. The asymmetry in the Dalitz plot linear slopes...

Search for direct CP-violation in $K^{\pm} \to \pi^{\pm} \pi^{0} \pi^{0}$ decays (2006)

Batley, J Richard, Culling, A J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Slater, M W, ...

A search for direct CP-violation in $K^{\pm}\rightarrow \pi^\pm \pi^0 \pi^0$ decay based on 47.14 million events has been performed by the NA48/2 experiment at the CERN SPS. The asymmetry in the...

Observation of a cusp-like structure in the $\pi^{0}\pi^{0}$ invariant mass distribution from $K^{+-} \to \pi^{+-}\pi^{0}\pi^{0}$ decay and determination of the $\pi\pi$ scattering lengths (2005)

Batley, J Richard, Anzivino, Giuseppina, Arcidiacono, R, Baldini, W, Balev, S, Behler, M, ...

We report the results from a study of ~23 Million K+- ==> pi+- pizero pizero decays recorded by the NA48/2 experiment at the CERN SPS, showing an anomaly in the pizero pizero invariant mass...

A measurement of the CP-conserving component of the Decay $K^{O}_{S} \to \pi^{+}\pi^{-}\pi^{0}$ (2005)

Batley, J Richard, Lazzeroni, C, Munday, D J, Patel, M, Slater, M W, Wotton, S A, ...

The NA48 collaboration has measured the amplitude of the CP-conserving component of the decay K^0_S -> \pi^+ \pi^- \pi^0 relative to K^0_L -> \pi ^+ \pi^- \pi ^0. For the characteristic parameter...

Measurement of the $K_{L} \to e^{+}e^{-}e^{+} e^{-}$ Decay Rate (2005)

Lai, A, Bearden, I G, Marras, D, Batley, J Richard, Dosanjh, R S, Gershon, T J, ...

The decay rate of the long-lived neutral K meson into the e^+ e^- e^+ e^- final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200...

Search for CP violation in $K^{0} \to 3\pi^{0}$ decays (2005)

Lai, A, Marras, D, Batley, J Richard, Dosanjh, R S, Gershon, T J, Kalmus, George Ernest, ...

Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violation decay K_s -> 3pi^0 has been performed. From a fit to the lifetime distribution of about 4.9...

Measurement of the Radiative Ke3 Branching Ratio (2004)

Anzivino, Giuseppina, Barr, G, Becker, H G, Bertanza, L, Bevan, A, Biino, C, ...

We present a measurement of the relative branching ratio of the decay KL -> pi e nu gamma (Ke3gamma) with respect to KL-> pi e nu (gamma) (Ke3+Ke3gamma) decay. The result is based on observation of...

Measurement of the Radiative $K_{e3}$ Branching Ratio (2004)

Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, Hay, B, ...

We present a measurement of the relative branching ratio of the decay {K}^0 -> pi+-e-+ nu gamma ({K}_e3 gamma) with respect to {K}^0 -> pi+- e-+ nu (gamma) ({k}_e3 + k}_e3 gamma) decay. The result is...

Measurement of $K_{e3}^{0}$ form factors (2004)

Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, Hay, B, ...

The semileptonic decay of the neutral K meson KL -> pi+-e-+v (Ke3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by...

Measurement of the branching ratio of the deca $K_{L} /to \pi^{\pm}e^{\mp}\nu$ and extraction of the CKM parameter Vus (2004)

Lai, A, Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, ...

We present a new measurement of the branching ratio R of the decay KL -> pi+-e-+nu, denoted as Ke3, relative to all charged Kl decays with two tracks, based on data taken with the NA48 detector at...

Search for CP violation in $K^{0} \to 3 \pi^{0}$ decays (2004)

Batley, J Richard, Lai, A, Marras, D, Batley, J Richard, Dosanjh, R S, Gershon, T J, ...

Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K_S -> 3 pi0 has been performed. From a fit to the lifetime distribution of about 4.9...

Observation of the rare decays $K_{s} \to \pi^{0} \mu^{+} \mu^{-}$ (2004)

Batley, J Richard, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Patel, M, Slater, M W, ...

A search for the decay Ks -> pi0 mu+ mu- has been made by the NA48/1 Colaboration at the CERN SPS accelerator. The data were collected during 2002 with a high intensity Ks beam. Six events were found...

Measurement of the branching ratio and form factors for the decay $K_{L} \to \pi^{\pm}\pi^{0} e^{\mp}\nu_{e}(\bar{\nu}_{e})$ (2004)

Batley, J Richard, Dosanjh, R S, Gershon, T J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, ...

The K_L -> pi+- pi0 e-+ nu_e(nubar_e) decau was investigated with the NA48 detector at CERN SPS using a beam of long-lived neutral kaons. The branching ratio Br(K_L -> pi+- pi0 e-+...

Measurement of the $\Xi^0 \rightarrow \Lambda\gamma$ Decay Asymmetry and Branching Fraction (2003)

Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, Hay, B, ...

In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi0 -> Lambda gamma have been found with an estimated background of 58 +- 8 events....

Observation of the rare decay $K_S \rightarrow \pi^0 \mathrm{e}^+\mathrm{e}^-$ (2003)

Batley, J Richard, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, Patel, M, Slater, M W, ...

A search for the decay K_S -> pi0e+e- has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity K_S beam, 7 events were...

First observation of the $K_{S}\to \pi^{0}\gamma\gamma$ decay (2003)

Lai, A, Marras, D, Batley, J Richard, Dosanjh, R S, Gershon, T J, Kalmus, George Ernest, ...

Using the NA48 detector at the CERN SPS, 31K_S -> \pi^0\gamma\gamma candidates with an estimated background of 13.7 +- 3.2 events have been observed. This first observation leads to a branching ratio...

Investigation of $K_{L,S} \rightarrow \pi^{+}\pi^{-}e^{+}e^{-}$ decays (2003)

Lai, A, Anzivino, Giuseppina, Arcidiacono, R, Barr, G, Becker, H G, Bevan, A, ...

The K_L -> pi+pi-e+e- and K_S -> pi+pi-e+e- decay modes have been studied in detail using the NA48 detector at CERN SPS. Based on the data collected during the 1998 and 1999 run periods, a sample of...

Search for the decay $K_{s} \to \pi^{0}\gamma\gamma$ (2003)

Lai, A, Marras, D, Batley, J Richard, Bevan, A, Dosanjh, R S, Gershon, T J, ...

A search for the decay $K_S\to\pi^0\gamma\gamma$ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity $K_S$ beam, an upper...

Precise measurements of the $K_{S}\to\gamma\gamma$ and $K_{L}\to\gamma\gamma$ decay rates (2002)

Lai, A, Marras, D, Batley, J Richard, Dosanjh, R S, Gershon, T J, Kalmus, George Ernest, ...

The K_S -> gammagamma 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) -> gammagamma = (2.78 +-...

A precision measurement of direct CP violation in the decay of neutral kaons into two pions (2002)

Batley, J Richard, Dosanjh, R S, Gershon, T J, Kalmus, George Ernest, Lazzeroni, C, Munday, D J, ...

The direct CP violation parameter Re($\epsilon'/\epsilon)$ has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. The 2001 running period was...

Precise measurement of the decay $K_{L} \to \pi^{0}\gamma\gamma$ (2002)

Lai, A, Marras, D, Bevan, A, Dosanjh, R S, Gershon, T J, Hay, B, ...

The decay rate of $\klpgg$ has been measured with the NA48 detector at the CERN SPS. A total of $2558$ $\klpgg$ candidates have been observed with a residual background of $3.2\%$. The branching...

A Measurement of the $K_{s}$ Lifetime (2002)

Lai, A, Marras, D, Batley, J Richard, Bevan, A, Dosanjh, R S, Gershon, T J, ...

A measurement of the $\KS$ lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The $\KS$ lifetime is derived from the ratio of decay time...

Search for the decay $K_{s} \to \pi^{0}\gamma\gamma$ (2002)

Lai, A., Marras, D., Batley, R., Bevan, A., Dosanjh, R S., Gershon, T J., ...