A Search for Rare Decay D0 --> mu+mu - High Energy Physics UPRM

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¥£¨ … D† ƒ ‡ ˆ ‡ Š ‹ —…£Ì¥ÉÁ¥¥¿…5.4 Cut Optimization Results 88”Monte Carlo generated data, the efficiencyA¯±is calculated as the number of events in theGaussian curve divided by the total number of generated events.Our reconstruction process followed by the analysis algorithm let us observe 135432D† ƒK Š7“ ˆ events with a detection efficiency of 3.9%. Table 5.2 summarizes the resultsfor the best cut combination. For the backgound ratio study the results using the finalselection criteria are shown in Figure 5.6.Table 5.2: Results of Cut Optimization.5.725WV 8 @BADCFEHGJILKJM!N!O0.9PQASRTUKT[N aTUGJNbADc @BA^C_EHGJIKJM!N!Ò "XIYZO!T[C\R]YZOdYZN!e]TfRThgiThRkj l`M!m noYZIXp[l`qar2.96D ÷ts 2vuw2 Yyx CzTUYZN!C\j 5?{ 82.8D ÷ s K 6 u|Yyx C}TUY~N!Cj 5¡{ 8 3.9dYZN!e]TfRThgiThRkj 5}€‚Zƒ d„ 81.1¿ÏŸUsing the Rolke and López algorithm, the sensitivity number is determined to beÁ . Then the experimental sensitivity is calculated as¿ÀŸÔ Ì£ Š à£ Šˆ‡(5.1)Ì›¿ÏŸ…£4É¿ÏÈ…ÌÕ¿ÀÈÈ†…£ Š à—§££ Š àlimit ofThis result is encouraging since it is much lower than the existing 90% confidenceÔm¿measurements.£ Šˆ‡. This means that our measurement will be more precise than previous
5.5 Confidence Limits 89”Figure 5.6: Invariant Mass Distribution for Background Ratio using the best cutcombination.5.5 Confidence LimitsOnce our selection criteria were optimized, we proceeded to open the masked area.Applying the best cut combination to dimuonic events within our signal area we have twoevents in that region. Thus, we have five events in sidebands area (i—in the signal area (‰ —¦¥ ).É ) and two events¿ÀÊ›¿ÏŸUsing the Rolke and López routines, for • —§Éand, the 90% confidence level lower limit is 0 and the 90% confidence level upper limit¥ , the background rate (–j—¦mš4• ) is
Page 1 and 2:
A Search for the Rare Decay D£¥¤
Page 3 and 4:
ResumenEste trabajo de tesis presen
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AcknowledgmentsThere are so many pe
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to work on their experiment. To all
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extremos que ésta nos presenta. Y
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amigos de universidad, Arnulfo Barr
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1.2.1 Conservation of Angular Momen
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4. Vertex z Positions . . . . . . .
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List of Tables2.1 Chronological bra
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2.4 The FOCUS Spectrometer . . . .
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M2: Magnet Number 2.: Lorentz Dimuo
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1.1 The Standard Model 2`the branch
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families of matter. These are divid
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The Standard Model 6Each of the thr
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ŽuŽd’ ‘ “”“ “-• —
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%1.2 Conservation Laws 10current be
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Conservation Laws 12`1.2handed lept
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Conservation Laws 14`1.2A §Aº‰
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However, these states are +63-1.3 C
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ÇÇÇÇÆÈoH ‚ ¿ oH ‚ ¿ ‚
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W¦¨ , , and © o ¨ cÏ Î7Ô¦Ca
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1.4 GIM Mechanism 22`1.4 GIM Mechan
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1.5 Rare and Forbidden Decays 24whe
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55 q z4so ¤ pj¥4osoÛ { J zF45 (1
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Notice that AA5 q z ¤ q z oiÛ z?
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Chapter 2Previous Works2.1 FCNC Dec
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ŠŠz‘i2.2 Previous Searches for
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˜¥˜‘2.2 Previous Searches for
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··i2.2 Previous Searches for Rare
Page 60 and 61: i2.3 FOCUS 382.3 FOCUS2.3.1 Introdu
Page 62 and 63: ¥i2.3 FOCUS 40were transmited with
Page 64 and 65: i2.3 FOCUS 42the experimental targe
Page 66 and 67: Chapter 3ObjectivesAs a departure p
Page 68 and 69: Chapter 4ProcedureThis chapter will
Page 70 and 71: 4.2 Reconstruction Process 48Recons
Page 72 and 73: 4.3 Data Selection 50Figure 4.1 sho
Page 74 and 75: °4.3 Data Selection 52Using inform
Page 76 and 77: i4.3 Data Selection 54to detect muo
Page 78 and 79: ›4.3 Data Selection 56Information
Page 80 and 81: kŸnJÑ,ššJBn©kŸnJšz¥{{[“
Page 82 and 83: 4.3 Data Selection 60iReconstructio
Page 84 and 85: ‘°4.3 Data Selection 62iTable 4.
Page 86 and 87: gJ\·+UpUW†WX†UUX†UUpWWtArs;u
Page 88 and 89: 4.5 Monte Carlo Simulation 66ia spe
Page 90 and 91: ”4.6 Analysis Methodology 68signa
Page 92 and 93: signal region and determined the co
Page 94 and 95: sideband was defined as £Í£¥Í
Page 96 and 97: ƒ”4.7 Background Study 74K†«
Page 98 and 99: 4.7 Background Study 76”Figure 4.
Page 100 and 101: 4.8 Optimization of the Selection C
Page 102 and 103: ISOS ïþëÿ÷ ¡ ü&ë&÷¢üÕë
Page 104 and 105: 5.2 Background Ratio 82”Figure 5.
Page 106 and 107: 5.3 Skimming Results 84”Figure 5.
Page 108 and 109: ”5.4 Cut Optimization Results 86b
Page 112 and 113: … D† ƒo‡ ˆ ‡ Š ‹ —£
Page 114 and 115: List of References[1] M. Herrero, T
Page 116 and 117: æææ”Bibliography 94[19] T. Sj
Page 118 and 119: æˆææBibliography 96”[37] Ferm
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