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Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkD p<3L $3HV  +  l<  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. T(BcEB@$  &     d    6    > Thanks0 @B($   /  ,0468:<P 0` ̙33` ` ff3333f` 333MMM` f` f` 3b?" de,d?nK}e %P %nA}@%F`d v?" dd   " @ `@n?" dd  @@``P`!"1d 1d@1d` 1}d`f" d  " @@ ``p1" dd1 dd0" dd0 dd0d1" dd1 dd0" dd0 dd0d Z R  (  8 W W`"  0Gx P`"  0G}} UZ"  s *G33 UYZ"  s *G33 YWZ"  s *Gff3 YUZ"  s *G33 Z"  s *G} SVZ"   s *Gff3 YZ"   s *Gff3 X   6T4_ж_ж [  Liu Minghui Nanjing 2008-4-27(!> e!c ! 6 @ @ @   64_ж_ж 2z *(> ec   6 @ @ @LB   c $D3fc%I@&  Hܡ4_ж_ж   _ 4 X ` cQ h hev ec   6 @ @ @  HT_ж_ж P  T X ` cQ h hev~> ~ >~<  c $޽h ? ̙33y___PPT10Y+D='  = @B +X  0L0 g_` (     T_ж_ж  YY  F2 >~> ~ >~8 ,U ,UZ"  s *G3 ,U  6ا_ж_ж ZU Physics Motivation (1)&> ec  6 @ @ @  0 # l0e0eA !? ?"  ! 6   <B  I | Study of ttbar spin correlation,!df f !   <Ȫ  F  %The spin of t and tbar are correlated,&df%f&   X2  0F ` <  c $޽h ? ̙33y___PPT10Y+D='  = @B +   0L0 p (  F ,U  ,UZ"  s *G3 ,U  6$ _ж_ж ZU Physics Motivation (2)&> ec  6 @ @ @   # l _ж_ж  YY   J6 >~> ~ >~Z   <\+  ?"6@ NNN?N7 t ~v0___PPT106___PPT9 *H BR(tWb)~100% No top hadronizationn%0 q2eef ff>       nX   0% q    <*   tStudy of W polarization,dff  <  c $޽h ? ̙33y___PPT10Y+D='  = @B +]  0L0 ld@ (  F ,U  ,UZ"  s *G3 ,U  6 _ж_ж ZU Physics Motivation (3)&> ec  6 @ @ @  # l _ж_ж  YY   J6 >~> ~ >~  <U/T P &W polarization ttbar spin correlation8'fdff ' X  0]   <n/ } *Precisely predicted by the Standard Model*+df*f + X2  0w8  <T ZValidate the SM Test of V-A structure Search for anomalous coupling Search for new physicsB[ffdfJf [ <  c $޽h ? ̙33y___PPT10Y+D='  = @B +  0L0 `!.<(  t  0 _ж_ж p8___PPT10F___PPT9(  vn tt spin correlation parameters t and t not polarised in tt pairs, but correlations between spins of t and t"0 qcM gg gfMg m : @ @ @qR"  s * G bZ  S A 0?  0LB  c $Dff3cxZ   S A 1?   1LB  c $Dff3jJ7zR"  s *3$ Z   0p _ж_ж   ~v0___PPT106___PPT9 AD=-0.29^ >8 Agfofgf  6 @ @ @LB  c $Dff3J*m  0_ж_ж f  0~v0___PPT106___PPT9  Mtt<550 GeVP >0 pck c  6 @ @ @  0, _ж_ж    ~v0___PPT106___PPT9 AD=-0.24^ >8 Agfofgf  6 @ @ @  # BCDE F(f$//_/@"`vM m X"  0Gffcp8 X"  0Geff3c e LB  c $Dff3c   LB  c $Dff3c  LB  c $Dff3c R"  s *3$ Z ! 0' _ж_ж  ~v0___PPT106___PPT9 A=0.420>8 Agf  6 @ @ @ " 02_ж_ж  ~v0___PPT106___PPT9 A=0.330>8 Agf  6 @ @ @ # # BC,DE F(f$JiJii+iJ@"`9 M m LB $ c $Dff3J c F ,U % Z'qZ" & s *G3 ,U7 ' 6$&_ж_ж |U 5Study of W polarization and ttbar spin correlation(1)&6> e6c 6 6 @ @ @X ( 0   ) 0L # q  _ SM* 2f   * 0X    T prediction 2 f  LB + c $Dff3J  , 04   tt spin correlationL pK32df33&   RB - s *DԔ/ d/" . 6L43$9  [Add restrictionf  <  c $޽h ? ̙33y___PPT10Y+D=' 2= @B +W  0L0 f^.(  R"  s *3$  R"  s *3$ j R"  s * G bLB  c $Dff3cx  0Q4_ж_ж PT'~v0___PPT106___PPT9 4 tt spin correlation parameters with final objectsZ50 qcgfgf2gf 2 6 @ @ @Z  S A 6?dk x  6Z  S A 7? dO  7"  6X_ж_жGY  w ~v0___PPT106___PPT9 Angle between spin analysersP>8 h cgc  6 @ @ @  0_ж_ж  j ~v0___PPT106___PPT9 'Angle between t (t ) and spin analysers((>0 u(c ( 6 @ @ @FB  S D$) FB  S D$ FB  S D$@  X"  0GffcC T X"  0Geff3cs  @B  C D$6 ~ 7 F ,U ( Z'qZ" ) s *G3 ,U7 * 6p4_ж_ж |U 5Study of W polarization and ttbar spin correlation(2)&6> e6c 6 6 @ @ @  + 0$j4   tt spin correlationL pK32df33&   RB , s *DԔ/ d/LB - c $Dff3jJP7zQ . 07w ,p1and 2 are spin analyzing power of the spin analyzers V9 2f ff f0fB 1 <  c $޽h ? ̙33y___PPT10Y+D=' $= @B +  0L0 ($_(  $8 5 2  $IgZ" $ s *G;33 5 2  $ 0f_ж_ж 5 2 ~v0___PPT106___PPT9 Rangle between lepton direction in W rest frame and W direction in top rest frame BS>0 eQgfg S 6 @ @ @;8  :  $ w Z@ j:  $j: B $ 3 Aj: T" $ c $G Y +  $ 0q_ж_ж + v ]  Y0( "g  6 @ @ @T"  $ c $G#  % T"  $ c $G/ < "  $ <w_ж_жG}   T  spin=1/2& > c c   6 @ @ @ "  $ <~_ж_жG}  T  1 &> cc   6 @ @ @ "  $ <_ж_жG}  T  1/2&> cc   6 @ @ @L" $ c $G 8 o $m7 `" $ 0G$ab $ S A /?z@ /`" $ 0Gxcz/`" $ 0Gxffc _ `" $ 0Gxff3c ET" $ c $G o'RB $@ s *D$V " F ,U $ Z'qZ"  $ s *G3 ,U7 !$ 64_ж_ж |U 5Study of W polarization and ttbar spin correlation(3)&6> e6c 6 6 @ @ @ "$ 0    W polarizationL pK32df33   #$ 0$6 IT TzThere are 3 kinds of W polarization: left handed, right handed and longitudinal. There components correspond to FL, FR, F0{ 2ffPfff  f  f  f  f  f  f {  %$ 0XF f  LSM 2f  X &$ 0 V , '$ 0$ 2c   F0=0.695 FL=0.304 FR=0.001 2fffffff  < $ c $޽h ? ̙33y___PPT10Y+D=' = @B +a  0L0 ph% (  L"  c $G z L"  c $G l L"  c $G y  L"  c $G u L"  c $G ym F ,U  Z'qZ"  s *G3 ,U7  64_ж_ж |U 5Study of W polarization and ttbar spin correlation(4)&6> e6c 6 6 @ @ @  0\4  Used channels in our studyL pK32df33  f  0̙1"`}   <X6  ?"6@ NNN?N X___PPT1080___PPT9xp U Full hadronic: jets Dileptonic: 2 l + 2 b + 2 n Semileptonic: l + n + 2b + jets V q2cc#  ccc # #cc c#~             n5  <4?"6@ NNN?N2 : ~v0___PPT106___PPT9  Number of events (10 fb-1)`8 q2ckccf           ! <\7 ?"6@ NNN?NJS ~v0___PPT106___PPT9 3.7M 0.4M 2.5Mr0 qx2cc cc$     n" " H1?"6@`NNN?N  # B7 8c?"6@`NNN?N] j4___PPT10 B___PPT9$  tt final states<( q2cc&   " $ T.41?"6@`NNN?Ns I  uWe studied the W polarization and ttbar spin correlation in both ttbar semileptonic channel and dileptonic channel Bv@ff2f v LB % c $D"m "<  c $޽h ? ̙33y___PPT10Y+D=' = @B +K 0L0 ZR#>(  L"  c $G z L"  c $G l L"  c $G y  L"  c $G u L"  c $G ym F ,U  Z'qZ"  s *G3 ,U7   6H_ж_ж |U 5Study of W polarization and ttbar spin correlation(5)&6> e6c 6 6 @ @ @  0?  Event selectionL pK32df33    Py  8 #"+*+'    <?z y   ETmiss>40GeV,   (    @`  <`?@ z y  vexactly 2 b-jets   @`D  <$?z @ y  D2 isolated lepton pt>20GeV ||<2.5,#&   @`  <? z y  f dileptonic     @`  <~?{z   ETmiss>30GeV,      @`  <xv?@ {z  6 2 b-jets, e"2 light jets   @`D  <4?{@ z  D1 isolated lepton pt>20GeV ||<2.5,#&   @`  <H4? {z  h semileptonic     @`  <4?P{ dcut3   @`  <?@ P{ dcut2   @`  <5?P@ { dcut1   @`  <n? P{ echannel   @``B   0o ? PPZB ! s *1 ? {{ZB " s *1 ? z z `B # 0o ? y y `B $ 0o ? P y ZB % s *1 ?Py ZB & s *1 ?@ P@ y ZB ' s *1 ?Py `B ( 0o ?Py l 9 0D$  (After selection: For W polarization, angle Y was reconstructed For tt spin correlation, q1, q2 and F were reconstructed 2+fffCf ffff&`  3 LB < c $D,,LB > c $Df<  c $޽h ? ̙33y___PPT10Y+D=' = @B +C  0L0 RJ$((  (: ( 3 A } Sp : ( 3 A  s L" ( c $G z : ( 3 A {  ( BXC'DE<F$ff3c++A+G+W+)++#+q%''@    m   ( BCDE F(ff3$eeeeee11e@P T  ( 0_ж_ж l ~v0___PPT106___PPT9 Reconstruction and cuts.>0 eg  6 @ @ @ ( BnCDE(F0ff3$ miiliimm@i  ( BCnDE(F0ff3$ mee@ yf   ( 0_ж_ж  w#~v0___PPT106___PPT9 efficiency function :0>8 )gf  6 @ @ @  ( 0_ж_ж  lU ~v0___PPT106___PPT9 !Fit with pol3 in range [-0.9;0.8].">0 e"g  " 6 @ @ @  ( 0_ж_ж @g ~v0___PPT106___PPT9  parton level. >0 p g   6 @ @ @L" ( c $G l L" ( c $G y  L" ( c $G u  ( 0|   ~v0___PPT106___PPT9 cosY>>8 pc c   6 @ @ @ ( 08_ж_ж   ~v0___PPT106___PPT9 cosY>>8 pc c   6 @ @ @L" ( c $G ym  ( 6#8_ж_ж ~v0___PPT106___PPT9 1/N dN/dcosY> >8 p c c   6 @ @ @ ( 6&8_ж_ж !J ~v0___PPT106___PPT9 1/N dN/dcosY> >8 p c c   6 @ @ @8 QF (FQZ" ( s *G;33 QF ( 038_ж_ж QF4___PPT10 B___PPT9$  After events selection and reconstruction, the cos distribution is changed, we use an efficiency function to correct this difference.F0 q}e2gfUgfB/  S :  C C CF ,U !( Z'qZ" "( s *G3 ,U7 #( 6 _ж_ж |U 5Study of W polarization and ttbar spin correlation(6)&6> e6c 6 6 @ @ @  $( 0 0 Our correction to selection and reconstructionL1 pK32d/f33 1 <  ( c $޽h ? ̙33y___PPT10Y+D=' = @B +  0L0 % ,(  ,F ,U , Z'qZ" , s *G3 ,U7 , 6^$_ж_ж |U 5Study of W polarization and ttbar spin correlation(7)&6> e6c 6 6 @ @ @,  , 0DI ` Systematics in our studies semileptonic channel<1 pK320f33 1 ^  , 6A ?< , c $޽h ? ̙33y___PPT10Y+D=' = @B +! 0L0   *d(  F ,U  Z'qZ"  s *G3 ,U7  6D_ж_ж |U 5Study of W polarization and ttbar spin correlation(8)&6> e6c 6 6 @ @ @(  0I \ Systematics in our studies dileptonic channel</ pK32.f33 / S  d #""!% 2  <2? a0.167   @`  <]$? a0.282   @`  <$? a0.039   @`  <$?#  a0.076   @`  <$?z #  a0.079   @`  <p$?z  cTotal   @`  <$?m  m0.121 0.115 0.006   @`  <l$?m  m0.231 0.161 0.006   @`  <|$?m  s0.022 0.023 0.002 0.014   @`  <t4?# m  s0.040 0.051 0.002 0.026   @`  <4?z m #  s0.063 0.039 0.007 0.011   @`0  <4?m z  `b tagging efficiency(5%) b jet energy scale(3%) backgrounds uncertainty(5%) Input top mass(5GeV)aa a  @`  <?m  #0.003 0.005 0.001 0.000 0.004 0.003$$ $  @`  <?m  #0.011 0.008 0.001 0.005 0.007 0.005$$ $  @`  <?m  #0.002 0.003 0.001 0.008 0.002 0.002$$ $  @`  <|ӑ?# m  #0.010 0.004 0.001 0.008 0.003 0.003$$ $  @`  <=?z # m  #0.011 0.002 0.000 0.016 0.002 0.002$$ $  @`  <<@?z m  -GQ-scale Structure function ISR FSR b fragmentation Hadronization schemeVHfFf F V         @`   <ϑ? pAD(    @`   <? aA   @`   <? pFR(    @`   <?#  pF0(    @`   < ?z #  pFL(    @`  <.?z  sSource of uncertainty   @``B   0o ?ZB ! s *1 ?ZB " s *1 ?m m ZB # s *1 ?`B $ 0o ?`B % 0o ?ZB & s *1 ?z z ZB ' s *1 ?# # ZB ( s *1 ?ZB ) s *1 ?ZB * s *1 ?`B + 0o ?<  c $޽h ? ̙33y___PPT10Y+D=' = @B +  0L0   0_ (  F ,U  Z'qZ"  s *G3 ,U7  6xL_ж_ж |U 5Study of W polarization and ttbar spin correlation(9)&6> e6c 6 6 @ @ @  0B2I z Final results< pK32f33  "  <8 dM  tSemileptonic channel0f33  Q  0dz 7 /  W polarization: FL= 0.290.02(stat)0.03(syst) F0= 0.700.03(stat)0.02(syst) FR= 0.010.02(stat)0.02(syst) 2f  :  0 ` Y  Xttbar spin correlation: A = 0.670.08(stat)0.15(syst) AD= -0.400.05(stat)0.08(syst)RY 2ff9fff Y "  <h$ dM  rDileptonic channel0f33  k  0^  7  W polarization: FL= 0.2970.026(stat)0.079(syst) F0= 0.7090.044(stat)0.076(syst) FR= -0.0050.027(stat)0.039(syst) 2f  @  0D V  ^ttbar spin correlation: A = 0.4900.228(stat)0.282(syst) AD= -0.3470.157(stat)0.167(syst)R_ 2ff<ff!f _ !  0L2] , kStatistical errors corresponding to integral luminosity of 1/fb (scaled from lower statistics artificially)l 2lk  X  0"z 0 A  0    qW polarization parameters are got with a sample of 770pb-1, while ttbar spin correlation with a sample of 220pb-1@r 28 5  r X  0F ^ <  c $޽h ? ̙33y___PPT10Y+D=' = @B +   0L0 @W(  @ @  N@T_ж_ж z<0 T F2 >~> ~ >~;8 ',g @,'gZ" @ s *G3 ',g @ 6l_ж_ж 'Yg~v0___PPT106___PPT9 Summary(> ec  6 @ @ @< @ c $޽h ? ̙33y___PPT10Y+D=' = @B +/   0L0 >6D(  D D  NST_ж_ж  `p T < D c $޽h ? ̙33y___PPT10Y+D=' = @B + 0  HD(  H^ H S  ?wh    H S ^  e+d   @` B H s *rllC ? ̙33 0 0LD(  L^ L S  ?wh   T L S T  e+d  T @` B L s *rllC ? ̙33 0 @PD(  P^ P S  ?wh   T P S 76  e+d  T @` B P s *rllC ? ̙33 0 PTD(  T^ T S  ?wh   T T S 4T  e+d  T @` B T s *rllC ? ̙33 0 p\D(  \^ \ S  ?wh   T \ S T  e+d  T @` B \ s *rllC ? ̙33 0 `D(  `^ ` S  ?wh   T ` S XT  e+d  T @` B ` s *rllC ? ̙33 0 dD(  d^ d S  ?wh   T d S T  e+d  T @` B d s *rllC ? ̙33  0 xD(  x^ x S  ?wh   ? x S ?  e+d  ? @` B x s *rllC ? ̙33  0 |D(  |^ | S  ?wh   ? | S "?  e+d  ? @` B | s *rllC ? ̙33 0 PV(  ^  S  ?wh      0X    e+d    @` B  s *rllC ? ̙33 0 pV(  ^  S  ?wh     0(   e+d   @` B  s *rllC ? ̙33 0 V(  ^  S  ?wh     0   e+d   @` B  s *rllC ? ̙33 0 V(  ^  S  ?wh   4  084   e+d  4 @` B  s *rllC ? ̙33 0 V(  ^  S  ?wh     0DK   e+d   @` B  s *rllC ? 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Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<P  0L0 %x(  L"  c $G z L"  c $G l L"  c $G y  L"  c $G u L"  c $G ym F ,U  Z'qZ"  s *G3 ,U7  6.h_ж_ж |U 5Study of W polarization and ttbar spin correlation(4)&6> e6c 6 6 @ @ @  0T0h  Used channels in our studyP pK32df3f3  f  0̙1"`} Q  <5h ?"6@ NNN?N 4___PPT10 B___PPT9$ U Full hadronic: jets Dileptonic: 2 l + 2 b + 2 n Semileptonic: l + n + 2b + jets V q2cc#  ccc##cc c#~             n#  <Bh?"6@ NNN?N7 ~v0___PPT106___PPT9  Number of events (10 fb-1)N8 q2ckcf          ! <Zh ?"6@ NNN?N2JSH ~v0___PPT106___PPT9  0.4M 2.5M^ 0 qx2c cc$     n" " H1?"6@`NNN?N`  # Bph 8c?"6@`NNN?N] j4___PPT10 B___PPT9$  tt final states<( q2cc&   " $ Tth1?"6@`NNN?Ns I  uWe studied the W polarization and ttbar spin correlation in both ttbar semileptonic channel and dileptonic channel Rv@ffdf2ffd v LB % c $D"m "<  c $޽h ? ̙33y___PPT10Y+D=' = @B +rL75T(7og<1F(in( < =/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTtܖ 0ܖDArialNew RomanTTtܖ 0ܖ" D[SOalNew RomanTTtܖ 0ܖ0DWingdingsRomanTTtܖ 0ܖ@DArial BlackmanTTtܖ 0ܖ"PDComic Sans MSnTTtܖ 0ܖB`DSymbolans MSnTTtܖ 0ܖpDBritannic BoldTTtܖ 0ܖ Dritannic BoldTTtܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2d 0ppp@ <4 w 0Tsg4dd 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<P  0L0  0 (  F ,U  Z'qZ"  s *G3 ,U7  6iO_ж_ж |U 5Study of W polarization and ttbar spin correlation(9)&6> e6c 6 6 @ @ @  0DI ~ Final results@ pK32f3f3  "  <ldM  xSemileptonic channel4f3f3  U  0hl /  W polarization: FL= 0.290.02(stat)0.03(syst) F0= 0.700.03(stat)0.02(syst) FR= 0.010.02(stat)0.02(syst) 2ff  F  0l` Y  Xttbar spin correlation: A = 0.670.08(stat)0.15(syst) AD= -0.400.05(stat)0.08(syst)^Y 2ff9ffnfff Y "  <l dM  vDileptonic channel4f3f3  o  0xl   W polarization: FL= 0.2970.026(stat)0.079(syst) F0= 0.7090.044(stat)0.076(syst) FR= -0.0050.027(stat)0.039(syst) 2ff  L  0lV  ^ttbar spin correlation: A = 0.4900.228(stat)0.282(syst) AD= -0.3470.157(stat)0.167(syst)^_ 2ff<ffnf!ff _ %  0l] , kStatistical errors corresponding to integral luminosity of 1/fb (scaled from lower statistics artificially)l 2lbk  X  0"z 0 Q  0l   qW polarization parameters are got with a sample of 770pb-1, while ttbar spin correlation with a sample of 220pb-1Pr 28bj5bj r X  0F ^ <  c $޽h ? ̙33y___PPT10Y+D=' = @B +rg;g<1F(in( < C/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTv2ܖ 0ܖDArialNew RomanTTv2ܖ 0ܖ" D[SOalNew RomanTTv2ܖ 0ܖ0DWingdingsRomanTTv2ܖ 0ܖ@DArial BlackmanTTv2ܖ 0ܖ"PDComic Sans MSnTTv2ܖ 0ܖB`DSymbolans MSnTTv2ܖ 0ܖpDBritannic BoldTTv2ܖ 0ܖ Dritannic BoldTTv2ܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2dz2 0ppp@ <4 w 0Tv2g4ddY2 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<P 0L0 #>B(  L"  c $G z L"  c $G l L"  c $G y  L"  c $G u L"  c $G ym F ,U  Z'qZ"  s *G3 ,U7   6_ж_ж |U 5Study of W polarization and ttbar spin correlation(5)&6> e6c 6 6 @ @ @  02  Event selectionP pK32df3f3  7  Py  8 #"+*+'    <h ?z y   ETmiss>40GeV2 BJ B(    @`  <?@ z y  xexactly 2 b-jetsB   @`H  <!?z @ y  D2 isolated lepton pt>20GeV ||<2.50#BB&   @`  <$? z y  h dileptonic  B   @`  <@5?{z   ETmiss>20GeV2 BJ B   @`  <dH?@ {z  6 2 b-jets, e"2 light jetsB   @`H  <DJ?{@ z  D1 isolated lepton pt>20GeV ||<2.50#BB&   @`  <dL? {z  j semileptonic  B   @`  <te?P{ fcut3B   @`  <o?@ P{ fcut2B   @`  <Tx?P@ { fcut1B   @`  <? P{ gchannelB   @``B   0o ? PPZB ! s *1 ? {{ZB " s *1 ? z z `B # 0o ? y y `B $ 0o ? P y ZB % s *1 ?Py ZB & s *1 ?@ P@ y ZB ' s *1 ?Py `B ( 0o ?Py  9 0  0(After selection: For W polarization, angle Y was reconstructed For tt spin correlation, q1, q2 and F were reconstructed 2+fffffCff fffffff&`  3 LB < c $D,,LB > c $Df<  c $޽h ? ̙33y___PPT10Y+D=' = @B +r17 <1F(in( < C/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTv2ܖ 0ܖDArialNew RomanTTv2ܖ 0ܖ" D[SOalNew RomanTTv2ܖ 0ܖ0DWingdingsRomanTTv2ܖ 0ܖ@DArial BlackmanTTv2ܖ 0ܖ"PDComic Sans MSnTTv2ܖ 0ܖB`DSymbolans MSnTTv2ܖ 0ܖpDBritannic BoldTTv2ܖ 0ܖ Dritannic BoldTTv2ܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2dz2 0ppp@ <4 w 0Tv2g4ddY2 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<PrZ6<1F(in( < C/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTv2ܖ 0ܖDArialNew RomanTTv2ܖ 0ܖ" D[SOalNew RomanTTv2ܖ 0ܖ0DWingdingsRomanTTv2ܖ 0ܖ@DArial BlackmanTTv2ܖ 0ܖ"PDComic Sans MSnTTv2ܖ 0ܖB`DSymbolans MSnTTv2ܖ 0ܖpDBritannic BoldTTv2ܖ 0ܖ Dritannic BoldTTv2ܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2dz2 0ppp@ <4 w 0Tv2g4ddY2 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<Pr*<1F(in( < C/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTv2ܖ 0ܖDArialNew RomanTTv2ܖ 0ܖ" D[SOalNew RomanTTv2ܖ 0ܖ0DWingdingsRomanTTv2ܖ 0ܖ@DArial BlackmanTTv2ܖ 0ܖ"PDComic Sans MSnTTv2ܖ 0ܖB`DSymbolans MSnTTv2ܖ 0ܖpDBritannic BoldTTv2ܖ 0ܖ Dritannic BoldTTv2ܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2dz2 0ppp@ <4 w 0Tv2g4ddY2 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<Pr^:#<1F(in( < C/$lQ_ Equation.30 Microsoft lQ_ 3.0!*lQ_ Equation.30 Microsoft lQ_ 3.00-lQ_ Equation.30 Microsoft lQ_ 3.01.lQ_ Equation.30 Microsoft lQ_ 3.061lQ_ Equation.30 Microsoft lQ_ 3.072lQ_ Equation.30 Microsoft lQ_ 3.0x/ 0DTimes New RomanTTv2ܖ 0ܖDArialNew RomanTTv2ܖ 0ܖ" D[SOalNew RomanTTv2ܖ 0ܖ0DWingdingsRomanTTv2ܖ 0ܖ@DArial BlackmanTTv2ܖ 0ܖ"PDComic Sans MSnTTv2ܖ 0ܖB`DSymbolans MSnTTv2ܖ 0ܖpDBritannic BoldTTv2ܖ 0ܖ Dritannic BoldTTv2ܖ 0ܖ D .  @n?" dd@  @@`` 5Z$ 0 ) %   ! $%&/'(/)*&+,?-/e0342$q (->}2$3މUkk_42$fo#0uKTA2$VE5)o$Nײ62$Z(g~4s/ 2$tΊU>6j+ׄ>rd R$)S0gH@05 2$vhٲ$ΊRqqN=b$իS!R"Gn92$vV! 2$9 MSŵY! * 0AA0 f3@8x g42d2dz2 0ppp@ <4 w 0Tv2g4ddY2 0p pڛ ʚ;ʚ;<4dddd  x 0 ___PPT10D[SOes New RomanTTx 0xDArialNew RomanTTx 0x" DTimes New RomanTTx 0x pp___PPT9xJ 7MC study of W polarization and ttbar spin correlation $87B$B( 8  OutlineB  Y 1. Physics motivation 2. Study of W polarization and ttbar spin correlation 3. SummaryKKK6KK KBF3F$3BF3 Z  top production: At LHC, ttbar produced mainly from g-g fusion, , means 8M ttbar events produced each year at low luminosity (1033cm-2s-1) p<3l<F$3B$BJBJBJB@27  q   Vtop decay: SM predicted: Almost all of the top quarks decay to W boson and b quarkJ p<3L F$3@HBV  +   l<B  / 3    5  7      9;   With MC samples, W polarization and tt spin correlation are studied in both tt semi-leptonic channel and dileptonic channel. A experimental method is given to extract these parameters; Systematics are estimated in our study; Deviation of A measurement indicates possibly an unknown systematics needing further investigation; The systematics are large for the limited statistics of MC samples. X(BDcFEB@r$  &     d F    > Thanks0 @B($   /  ,0468:<Pr##.A<1Root EntrydO)PvPicturesCurrent UserGSummaryInformation(      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~