Universit`a degli studi Roma Tre Measurement of the KL meson ...

More documents

Recommendations

Info

8 CONTENTS to data analysis. The single photon vertex reconstruction efficiency and the spatial resolution of the KL decay vertex are here analyzed, too. Chapter six is dedicated to the signal selection to reject the residual background, the backgroung composition, and the selection efficiency. In the seventh chapter, the fit results and the summary of the systematic uncertainties are shown, with a perspective of a final KL lifetime result including also the 2004 data sample.
Chapter 1 Neutral kaon physics with KLOE 1.1 Neutral kaons phenomenology In 1947, while studying cosmic-ray showers with a cloud-chamber, Rochester and Butler [4] observed a V-shaped track in the space below a lead plate (see Fig.1.1 on the left side). They explained this phenomenon as the decay in flight of a new heavy neutral particle with a mass about a thousand times the electron mass. Figure 1.1: Left: The decay of the neutral kaon. A V-shaped track is visible in the space below the lead plate. Right: A charged kaon decay into a muon and a neutrino. The kaon comes in at the top right of the chamber and the decay occurs where the track appears to bend to the left abruptly. This particle is now known as the neutral K-meson or neutral kaon (K 0 ). Though the kaons were produced with a frequency of a few percent relative to π-mesons, and therefore through strong interactions, their lifetime was about 10 −10 seconds, a time characteristic of weak interactions. Because of this contradiction in behaviour between production and decay, they were called strange particles. After few years, in 1953, Gell-Mann and Nishijima [5, 6] hypothesize the existence of a new quantum number, the strangeness (S), conserved in electromagnetic and strong interactions, but not in weak interactions, defined by the relation: Q = I3 + B 2 9 + S 2 (1.1)
Page 1: Università degli studi Roma Tre Di
Page 5 and 6: Contents 1 Neutral kaon physics wit
Page 7: Introduction The KLOE experiment ha
Page 11 and 12: 1.2. MASS AND DECAY MATRICES 11 Γ
Page 13 and 14: 1.4. THE QUARK-MIXING MATRIX 13 rel
Page 15 and 16: 1.4. THE QUARK-MIXING MATRIX 15 s13
Page 17 and 18: 1.5. DETERMINATION OF THE |VUS| MAT
Page 19 and 20: Chapter 2 The DAΦNE collider DAΦN
Page 21 and 22: ËÁÇÆÃÇÆÆÀÊÇÆÈÀËÁË
Page 23 and 24: ØÖÒØ×Ô¬×ØÓÒ×ÓÖÒØ¬
Page 25 and 26: 3.1. THE DRIFT CHAMBER 25 Figure 3.
Page 27 and 28: ÇËËÁÄÍÁÂÄÊÆÁÆÁËÅÁ
Page 29 and 30: 3.2. THE CALORIMETER 29 Figure 3.6:
Page 31 and 32: 3.2. THE CALORIMETER 31 Figure 3.7:
Page 33 and 34: 3.3. THE TRIGGER 33 3.3 The trigger
Page 35 and 36: 3.5. FILFO FILTERING 35 are associa
Page 37 and 38: 3.6. EVENT RECONSTRUCTION 37 • ca
Page 39 and 40: 3.6. EVENT RECONSTRUCTION 39 Figure
Page 41 and 42: Chapter 4 Data Sample and K L tag M
Page 43 and 44: 4.2. THE KL TAG 43 to GEANFI using
Page 45 and 46: 4.2. THE KL TAG 45 As explained in
Page 47 and 48: 4.2. THE KL TAG 47 while the good a
Page 49 and 50: Chapter 5 Data analysis 5.1 Introdu
Page 51 and 52: 5.1. INTRODUCTION 51 10 5 10 4 10 3
Page 53 and 54: 5.3. THE CONTROL SAMPLE KL → π +
Page 59 and 60:
5.3. THE CONTROL SAMPLE KL → π +
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
5.4. KL → π 0 π 0 π 0 DECAY ID
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Chapter 6 Signal selection and back
Page 79 and 80:
6.1. BACKGROUND REJECTION 79 and N
Page 81 and 82:
6.2. NUCLEAR INTERACTIONS 81 Events
Page 83 and 84:
6.2. NUCLEAR INTERACTIONS 83 Figure
Page 85 and 86:
6.3. KL → KS REGENERATION 85 The
Page 87 and 88:
Events / 1 MeV 6.4. NUCLEAR INTERAC
Page 89 and 90:
Chapter 7 Fit results and errors 7.
Page 91 and 92:
7.1. FIT TO THE KL PROPER TIME DIST
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
7.2. CORRECTIONS AND SYSTEMATIC ERR
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Chapter 8 Conclusions A measurement
Page 105 and 106:
By summarizing, the only correlated
Page 107 and 108:
Bibliography [1] K. G. Vosburgh et
Page 109:
BIBLIOGRAPHY 109 [31] M. Adinolfi e
show all

Universit`a degli studi Roma Tre Measurement of the KL meson ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?