Thesis
Reference
Study of the K[0s]K[0s] final state and the K[0s] inclusive production in two-photon collisions with the L3 detector at LEP
BRACCINI, Saverio
Abstract
Le collisionneur LEP au CERN est utilisé pour étudier les collisions photon-photon à travers la réaction e⁺e⁻->e⁺e⁻ X. La section efficace de production inclusive des mésons K[0s], en fonction de l'impulsion transverse et de la pseudorapidité, est mesurée. Un bon accord est trouvé entre les données expérimentales et les prédictions théoriques de QCD. L'état final K[0s]K[0s] est caractérisé par trois signaux résonants, dus à l'interférence destructive entre les mésons f₂(1270) et a₂(1320), à la formation du méson f'₂(1525) et à la formation de l'état résonant f[J](1710). Aucun signal résonant n'est observé dans la région de masse autour du candidat glueball [Xi](2230). La largeur partielle de désintégration en deux photons du méson tenseur f'₂(1525) est mesurée. La première étude de l'état f[J](1710) dans les collisions photon-photon est effectuée.
BRACCINI, Saverio. Study of the K[0s]K[0s] final state and the K[0s] inclusive production in two-photon collisions with the L3 detector at LEP . Thèse de doctorat : Univ. Genève, 2001, no. Sc. 3255
DOI : 10.13097/archive-ouverte/unige:40206
Available at:
http://archive-ouverte.unige.ch/unige:40206
Disclaimer: layout of this document may differ from the published version.
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3/ /) F HFI D 3 * ) " )
#
2 )82-> 9 /
)F ) 9) #
9
F 3 2 ) #
& (
" ) ( " $ ) 2 49* %
%$ " D " $
" ) R??S / F 3/
3 2 ! ""
" 2
( $ ,
" %
$ 9 / /
9 ") 2 %
'
: * # ( )$ ( L " /
$ 2 ) D )) :
* ): ( " -?9
2 " )" "%
'
9 / " " :2
"%
" (:))) 2 5 9$*
( ( " ) : " # "
") " :* ) ) "
$ ) )))2 * " )))
( ( F!ER?BS2
FD " %
$ /
$ ( " ( % F! ( R?CS "
" !+2 9 :* "
" 9 8 !+2 3
9 D 9 ( ( F!2
22 0
"
e e
e + + +
e + e + e +
e + e + e +
e e
e + + +
e + e + e +
e + e + e +
e e
e
e - e - e -
e - e - e -
e e
e - - -
- -
-
e - e - e -
e - e - e -
γ γ
γ
γ γ
γ
γ γ γ
γ γ γ
γ γ γ
γ γ γ
q
q q
q
q q
q
q q
q
q q
g g g
g g g
spectator spectator spectator
jet jet jet
spectator spectator spectator
jet jet jet
q q q
q q q
g g g
spectator spectator spectator
jet jet jet
Single Resolved Direct
Double Resolved
Real Gluon Virtual Gluon
) 82->G ) ()
3/ /)F D 3 2
2 ! ""
!"
(
) ! H!I R@,S )
9 ( (
" )
" E +,, 2 " ! 1 " $
) " # "" (
"E( ";
; / 2
8* ! 9" /
$( 2
0 " " ! 9 "
R@-S -C@?*$ (" $ " 9: " (
;
* ; E2 ! 9 $ -CB- -CB82
0
E -CBC*! (&(
) " " ) " )
$:( "2 ! ) $(
+,,, " $) " ) $ " +,B * 9 ( $
)3 )2
!( /9( $"
" ( +?2@%* 9)=2-2 (9>, ->,
) ) " ,2B Æ
9 " &
)=2-G $9 "!9 " 3!5* !5*8
F!2
$ 2 $ 9() " )
3 )2 ! 9 ) 9 -+B
/" HI $ )$)) $ ) " 8,, #2 )
"
* 9
( ) " 2 => (
B> # 9 ( $ + " ( ) ( $ -,, 2
) ) ) )
* $ $ ( ) (
) ($2 )$ ) +,,, 9 "
8?>, # 9 >? +BB ($2
( " ! " H) -CC>I ( "
) =2+G ) ! 3 " "
( " " :) " -CBC/+,,,2
2 " 9 " )
!5* !5* 8 F!2
$ ( / )$ (
Q -
-
-
/
=
,
H=2-I
9 -
-
( " (* -
( " (*
,
$ " (
) /
$ "2 3& *
( " ( ( " ) "
2 ( ( -, $
( +>, & 2
) ) " ! * " 1 2
9 /! H!I9
( " ( -,
2 ( 1 !
H!I 9 ) "82>2 ("*
( 1 !
H!I2 5 ) " ++ $ 1
! 2 ; ! ) 0 9 ( >-,
(*
) 0 $2 " 0) ) *
( : ) 9 ( 9 (
2 " "! ( ) E (
" ) )2
" () " 9 $ )
9 ( & 2 ( ) /
9 " ( - # !- " ( +> #
!+ R@+S2
)=2+ 9 $(! " " 3
" " " $ " :)2 $
) ) $ & ! )*
) :) ) )2
(
83 R@8S ( >, ) )
) " ! 2 ) " 8 & *
9 ) 2
$ " 8 9 ) =282 (
( ) " @B,, ) " 0 " ,2>
) ( 2 )* +=, ( 9
" =2=> ) " 8+ $ 9 2
(9 ) (* )
9 (
(2 9 ) =2=* " 9) (
(G
e-
e+
Outer Cooling Circuit
Muon Detector
Silicon Detector
Vertex Detector Hadron Calorimeter
Crown Door
Barrel Yoke Main Coil
Inner Cooling Circuit
BGO Calorimeter
z x
φ θ y
) =28G !$ " 8 2
" (
) ) ( 4F
) ( ( ( 9
(2
)/ 8 0 " 9* ) )/
=282 )
* A 3 )
9 " !*B39 3
( " ()02
) R,S 0 9 $ &
Hadron Calorimeter Barrel
Hadron Calorimeter Endcaps
Luminosity Monitor
FTC
BGO
BGO
SMD HC1
HC3 HC2 Z chamber
TEC
Active lead rings SLUM
RB24
)=2=G $9 " " 8 2
( 3
:) * )*
& AA " ) (
2 "
" ! ( $ " ( 9
" ) -,
2 ) " :)
( ) )) " 82 ) "
( $ 9 $ "
) 0 " 8 :)
Æ )) :2
:) ( " ( G
TEC + SMD (10 m rel.align.)
0 20 40 60 80
50 100 150 200
P (GeV / c) TEC only
TEC + SMD (25 m rel.align.) µ
µ
p /p (%) σ
T
TT
)=2>G $ ":)" :
9 9 # 2
3 (HI
E (
9 :) ( HI2
)=2> 9 " :)" "
$ " : 9 9 # 2 :
9 # ( & -@P
HIJ8P2
" ) ( ( ,2C2
) =2?H* (* * I 9 " -
"
9 => 2 $ # (
" 9 " -
" " 2
0 500 1000 1500
-0.2 -0.1 0 0.1 0.2
1999 Z peak σ = 0.018GeV TEC -1
[GeV -1 ]
Tracks/0.005
1/P MUON T - 1/P TEC T
0 1000 2000
-0.1 -0.05 0 0.05 0.1
1999 Z peak TEC+SMD σ = 0.011GeV -1
[GeV -1 ]
Tracks/0.005
1/P MUON T - 1/P TEC T
56 576
0 500 1000
-1 -0.5 0 0.5 1
1999 Z peak
Impact Parameter [mm]
Tracks/40 µ
σ = 89µ TEC
0 500 1000
-0.2 0 0.2
Impact Parameter [mm]
Tracks/12 µ
TEC+SMD σ = 27µ 1999 Z peak
TEC+SMD
56 56
) =2?G " :) " -
"
9 H* I 9 H(* I # 9 => 2
