Prospects for Higgs search at the LHC

Prospects for Higgs search at the LHC

Proceedings of ICHEP 2002, pp. 177–181 S. Bentvelsen, P. de Jong, J. Koch and E. Laenen (Editors) ELSEVIER  31st INTERNATIONAL CONFERENCE ON HIGH ...

684KB Sizes 0 Downloads 70 Views

Proceedings of ICHEP 2002, pp. 177–181 S. Bentvelsen, P. de Jong, J. Koch and E. Laenen (Editors)

ELSEVIER



31st INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS AMSTERDAM

             

Ý

       

                                                                        

  !  "" #  #  !  $% " !  & '$%

 % "" $ (    &  "( !( ) # !( *+,-  .    * /   -  $ (0  %$   !(  %0 (   '$% #      1 !# ½ ! " (% $ '$% $ "    ! ("   (% * / 1¿¿ % ¾  ½ -    " "2 #  3      " ! "" %  % Æ( " #"    #   #( " # &   41 5 67

  %(   '$0 %   !  +, $  $  %$ !    %0 $ "2     Æ( " 6 7 (   %   '$0 %     ! 8 (   8  Æ 9  0     " %( ! )  #    (  (   $ 0  # !  "   #)"(  ( (   # $!%  %$   " " $$  ! 647 !  % ! "" # $$ (  ($"  !%  "(" # 

                           !   " 

 #$ "  %   &   ' ( !  #) *      +   (          '    %&,-*$./01.2 3+4 15 - %6$7

 Ý

c 2003 Elsevier Science B.V. All rights reserved.  doi:10.1016/S0920-5632(02)02107-2

   :    2    & $ !  "" !0 ($" %  #  ( ;  !"  $ ( !  0 (  !  $$ ! "" $$0  %     % !(  #   %   3011 5    $!  # ) $    $ # ($%% ("      ! <  #      :  *:- "" # #(  "  (  #    "  ( ""     #!       !  : "" #

      ;    "  " !% #)0 "(   " (  " ! (   $     0  #   "   *&9- (  $"( #  # ( (   " $    %  !   ( #  = (0 $"   $  > $  =     '00 " 0  * &9-  ) !  $ (   %  ( #"  &9 0 ( !  "( !( $   % !  $0?() % 63 @7   &9 0  !  $  .  . A 6B7  "0    (  %0   !  $  !   $  ;   !  . 

¾ 178

F. Piccinini

  

 

 

              >              "           "                "        -     ´µ

     <               0       "                 0 

       ´µ         < "    ?@      "                +      '         8+               +











           "         "          !  

      "

- - Γtot

● Γt

● ΓW,ΓZ 50 40 30 20 10 0 60 50 40 30 20

● Γb

● Γτ

● Γγ

● Γg

40

60

expected accuracy (%)

                                         !   "           "           "  "   "           #$%& '            "  ()      *               "      +    "  ,       "   "  "   "  $ " -./ 0 " 

            1          2      

 * +       

  1 ,            #3&   #4& * , 

 * , 

#0& * ,  * , #00& * ,

#0&  ()           "  #05& 6  "         +    7       ! 

 "     2     +       "            "  8  "  +

  "      8   9    :        +

;  "  7          8   8       +  "         7     +    

   2    #0<= 03&

ΓZ/ΓW=zSM, no syst

35

Γb

25

Γtot Γτ ΓW,Z

ΓZ/ΓW=zSM, Γb/Γτ=ySM,no syst

30 20

Γg

15

Γγ

10

Γt

5 0 40

ΓZ/ΓW=zSM, syst

35

Γb

ΓZ/ΓW=zSM, Γb/Γτ=ySM, syst

30

Γtot Γg

25

Γτ Γγ

20

ΓW,Z

15

Γt

10

10

5

0

0 110

120

130

140

110

120

130

140

MH (GeV)

/   0 9  

   *,       A 8     *"  " #5&, 6  8 "       "  

      "   "        "   "     B  A   *  , C   * , A   *  ,         

    2        8+             *  ,              A  A                      "              +    8    "       " 

   "  "       ¾          *A  ,  +           +             1  "    '     +      +          "  







 





 179

Prospects for Higgs search at the LHC

                                                                    ! "                        #          $      

           %             & 

             ! '            $    %   %              () )*+,)-         (,,+ ,.-

/  /      (,0+1-      / ()-! 2                

               

   $                            

    ! %    

                      

$ ,        %      #23                                    45     5445    

   6 6 7  ! '       %        % ´µ         7 6 6 6   7             7            ! 8     )91 :;  %  

           %    6  6  6  6  6   6    ´µ

    %          6 (1-! <      



            $    6 7 6 = 6 = 6 = 6 = 6 = 6        %                  6           &  









    



  (1-

6



7

=





   ´ µ ) = ´µ ´ µ 

  ´ µ ´ µ   ´ µ ´ µ =    ) =  = ´ µ  )

´ µ



8 ) (1-  >   %     %   6                      6 6      45 %        

       ,11  ½ ! ? 

                         

            

    ,1@         A@         )1@ 



/     ! B                

                1@                          0@   ,A@! "    )91    ,11 :;     $    

/                                      6   6         )1@ (9,-! "      %           C$    &$     

 ! ? 

 6 6 7   

    ,1+1@ %    )1 :; ´ µ ´ µ         (,-     %         %             ´ µ ´µ ´ µ ´µ

         (1-! 8   )91 :;           11  ½     6 6                ´µ ´ µ    (,*-!







    B              

 45  &         ! ?      

 180

F. Piccinini

                  Ê           !" À # $  ¦  ¦      % &' ( )  * * &' ** )  (



,    " -  #.  /          01     2           3 ËÅ ÀÀÀÀ  À  " 4 ÀÀÀ  À  ËÅ

   ÀÀÀ           2     5                 6/ 2 5   3      2"      53    3  5  5 2    /       3 5         75       " 4    6      5   6             ÀÀÀ " -      5/  #.       !8 /        3  /      9       £  £         5      $   9   

   5   /,    $ $ " :            5             5            /                2    !" &  5   /        3                ,      3   2 /    3    02;" <  3    3     /            !        02; /  3        (!             3        !" 4    3    /                 ¦ ¦   5          À % &'"  /   ,         /





















        $$

   $ ¦  

¼

 

(" "+

  

 /        => 7  $   " ?              3 $@A   @A  $             B   C  $$" D3 

3/        "  !             / E          3      5       (" B "+C   À  % B*C &'         3     /         5               "  5             /  /  5           3  *F B *FC  À  % &' B* &'C / 5      ÀÀÀ 5         )F B*(FC  !" -       3  /   2 /        )(F ;"0"  ( &'  À  * &'  (!"







  =   5 3     /             /

       2  /

    3    02;" 1           G01 B     GG01C         2        3 /      " # 01 .  ;                3   3   /

           5   /          2  " 1                               

Prospects for Higgs search at the LHC

  

                                                      ½           !     

                                                "         #              

               $  ½    

  %    & ' (  )

        *        +  , '  "    - . /# /  /* 0        /# /                

  !*#!+    *   "  1"23#344 1"2 444 & - .      !*#!+ 

  ,  . && 5 6 7 8 " -   /* 0   /+ 2 &39 2 !     /+ 2 &&3$ : " -    ;  "

 6$& <&= 54  / ' 88  3&45&9 +  6  ,    / ' 88 .1;  <&= &9  & <&&=  $ >? -      

9 "(     >? -   ;  "

 6$: <&= &9 ;  "

 #  @@ <&&= &@9  !  - /     3&%: % > ?

   ;  "

 #  @% <&= &@9 + 6  # "  ;  "

 #  @% <&= &@:9 + 6 # "   6 >   ;  "

 6$ <&&= 5% @ * ?   1  ;  . $ <&= 59  3&5$:

 181

4 0 ?  # 6    +    3&$4:  "- 1   + (   ;  "

 6$ <444= 9 .    3&&$  .   "- 1   3&&%$ & + ,    ?" >     3&:&:: 5 ( 6 6   2 ; ?$$ <&= 5$% : /# /    3&$&45  ! ;     344@&@@ $ * A    /A2!/A*!*17! '    -1-4&49 + *     3&:&&& % * + 8  >, #   ;   @ <44:= 5%9 , /   * + 8   3&@$ @ ?; - 

  1 "  >   3&5& 4 /+    *   "  1"23#34:5@ 1"2 44: & / 6   - 6   ;  "

 6 <44%= $%9  34%5: & 6 6       3&: && 6 "  6 0    .1; & <44%=  &5 6 "  6 0     -    ;  "

 64 <444= :5% &: * ;  6 "  6 0    ;  "

 6$ <&= 45 & 6 "  6 0    ;  "

 6$ <444= 5: &$ 2 -   ;  #  ?5 <&= 5 &% 1 "  >  / + ! ;  ;  ?5 <444=  &@ ( 6    * /B   6 6      35& &4 , /  6 "  + >    3&&& 5 ! ? 

 # "   3&&% 5 ( 6    * /B   6 6      3&&:4 5& 6 0     3&5&5 55 ! 6C   1 ; .  <444= : 5: , ' /# / * ( 

<

 =  3&:@%9 !    ! ?    , /88 !*#;7+&& 5 D ?  * ;   6 "    3&$&: