Heavy Flavour results from Tevatron

Transcription

1 Heavy Flavour reult from Tevatron G.Boriov, Lancater Univerity, UK On behalf of CF and Ø collaboration Moriond-EW conference, la Thuile, 08 February 2012

2 Introduction For pat 10 year the Tevatron ha pioneered and etablihed the role of hadron collider for flavour phyic It became the main ource of reult on B, B baryon, B c Currently the experiment at Tevatron finalize their tudy and publih the reult with the full tatitic (up to 10 fb -1 ) In thi talk the new reult on: Rare B decay B 0, B μ μ (CF) B J/ψφ (CF, Ø) imuon charge aymmetry (Ø) A CP (K K ) A CP (π π ) (CF) Related meaurement B (CF) 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 2

3 B 0 and B μ μ (CF) SM prediction (A. Bura et al., arxiv: ) : Br (B μ μ )=(3.2±0.2) 10 9 Br (B d μ μ )=(1.0±0.1) New phyic (e.g. msugra) can ignificantly change thi decay rate CF preented in ummer 2011 the analyi with 7 fb -1 (PRL 107, (2011) featuring an accumulation of ignal-like event with ~2.5σ deviation from the background New CF analyi include the full Run2 tatitic (9.6 fb -1 ) Given the interet to the previou reult, the analyi of the remaining tatitic i kept the ame 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 3

4 Exce of event for ν NN > 0.97 B μ μ (CF) p-value (background SM B μ μ hypothei) i 7.2% Exce for 0.97 < ν NN < appear to be tatitical fluctuation p-value for two highet NN bin (bkgsm B μ μ hypothei) i 22.4% Good conitency with the SM expectation 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 4

5 B 0 and B μ μ Reult (CF) Obtained reult (9.6 fb -1 ) : Br ( μ μ ) = (1.3 B Br ( B 0 μ μ ) < ) ( ) at 95% (90%) C.L. Firt double ided limit on Br (B μ μ ) < Br ( B μ μ ) < at 95% C.L < Br ( B μ μ ) < at 90% C.L. Conitent with other meaurement: zero : Br( B μ μ ) < (95% CL) LHCb : Br( B μ μ ) < (95% CL) CMS : Br( B μ μ ) < (95% CL) 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 5

6 CP aymmetry CP aymmetry i a key ingredient for undertanding the evolution of our univere The CP aymmetry contained in the SM i not ufficient to decribe the oberved abundance of matter in our world New ource of CP aymmetry are needed They hould reveal themelve by the deviation of the oberved CP aymmetry from the SM prediction 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 6

7 ecay B J/ψ φ It i a golden decay mode to meaure CP aymmetry in B ytem CP aymmetry in B J/ψφ decay i decribed by the phae φ J/ψφ Within the SM φ J/ψφ i related with the angle β of the (b) unitarity triangle: * J /, SM V = 2 = 2arg tbv V V * ~ λ 2 t φ ψϕ β = ± * VcbV V V * tb t ~ λ 4 ub u c V V * 2 cb c ~ λ φ J/ψφ can be ignificantly modified by the new phyic contribution: β φ J / ψϕ = φ J / ψϕ, SM φ NP 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 7

8 B J/ψ φ(cf) Full tatitic (9.6 fb -1 ) analyzed ~10950 ignal event Analyi i imilar to the previou meaurement with a part of tatitic arxiv: Both oppoite and ame ide flavour tagging calibrated in data Oppoite ide: ε 2 = (1.39 ± 0.01)% recalibrated for the full data et Same ide: ε 2 = (3.2 ± 1.4)%, calibrated and ued for ~half of tatitic Thi degrade the tatitical reolution of ϕ by no more than 15% 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 8

9 B J/ψ φreult (CF) Reult of angular analyi conitent with SM prediction p-value of the SM hypothei i 54% Reult on ΔΓ and Γ are till finalized Obtained value of β = ϕ J/ψφ /2 i: J / β ψϕ [ π / 2, 1.51] [ 0.06,0.30] [1.26, π / 2] (68% C.L.) 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 9

10 B J/ψ φ(ø) 8.0 fb -1 of data analyzed 6500 ignal event Only the oppoite flavour tagging i ued p-value for the SM point i 29.8% arxiv: τ = ΔΓ = φ = p p March 2012 G.Boriov, Heavy flavour reult from Tevatron 10

11 imuon charge aymmetry A b l (Ø) Ø collaboration oberve 3.9σ deviation from the SM prediction in the value of A b l uing 9 fb -1 of data b A l = ( ± (tat) ± (yt) )% A b l contain contribution of emileptonic charge aymmetrie a d l and a l The eparate value of a d l and a l are obtained from the tudy of the muon impact parameter dependence of A b l a a d l A b l = ( 0.12 ± 0.52)% = ( 1.81± 1.06)% N N b b 06 March l2012 G.Boriov, Heavy flavour reult from Tevatron 11 N N b b

12 Comparion with other meaurement Combining dimuon aymmetry with Ø meaurement of a l and world average value of a d l we get: = ( 0.89 ± 0.62)% Relation with the CP violating phae φ meaured in B J/ψφ decay: Thi reult i in good agreement with the B J/ψφ tudy of Ø and other collaboration a l a l ΔΓ = ΔM tan φ 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 12

13 CP aymmetry in 0 K K, π π CP violation in ingle Cabibbo uppreed 0 decay at O(1%) level ignal the new phyic contribution CF previouly meaured A CP (K K ) and A CP (π π ) with 6 fb 1 : CF : A A CP CP ( π ( K π ) = ( 0.22 ± 0.24 ± 0.11)% K ) = ( 0.24 ± 0.22 ± 0.10)% New analyi ue the full data et (9.6 fb -1 ) and i optimized for the meaurement of ΔA CP =A CP (K K ) A CP (π π ) motivated by the recent LHCb meaurement: LHCb : ΔA = A ( K K ) A ( π π ) = ( 0.82 ± 0.21± 0.11)% CP CP CP In the difference of aymmetrie many ytematic uncertaintie cancel and the election cut were looened to increae the tatitic In total 550K 0 π π decay and 1.21M 0 K K decay elected 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 13

14 Selected ignal 0 K K, π π The plot how the ignal in 0 K K, π π decay 0 Statitic in K K,π π decay i about the ame CF preliminary CF preliminary 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 14

15 CP aymmetry in 0 K K, π π CF preliminary Meaured value: CF : = ( 0.62 ± 0.21 ± 0.10)% ΔA CP 2.7 σ deviation from zero Conitent with the LHCb reult: LHCb : = ( 0.82 ± 0.21± 0.11)% ΔA CP The combination of the CF and LHCb reult give ~3.8σ deviation from zero. 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 15

16 Br( B ) (CF) CF recontruct emi-excluive decay B B B * * * with φπ or K * K 750 decay Br( B ) recontructed in total Reult: Br ( B Br ( B Br ( B * ± * * ) = (0.49 ± 0.06 ± 0.05 ± 0.08)% μ * ) = (1.13 ± 0.12 ± 0.09 ± 0.19)% ) = (1.75 ± 0.19 ± 0.17 ± 0.29)% 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 16

17 Br( B ) Firt evidence of thi decay i obtained by Ø: Br ( B Confirmed by Belle: Br ( B ) = ± ± ) = New CF meaurement ha ignificantly better preciion: Br ( B ) = ± ± ± (norm) 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 17

18 Summary Experiment at Tevatron finalize the analyi of their full tatitic New reult are preented in: B 0, B μ μ (CF) B J/ψφ (CF, Ø) imuon charge aymmetry (Ø) A CP (K K ) A CP (π π ) (CF) Related meaurement B (CF) Tevatron experiment produced many more intereting reult in heavy flavour phyic See online web page of the CF and Ø experiment: March 2012 G.Boriov, Heavy flavour reult from Tevatron 18

19 Backup 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 19

20 CF detector for B phyic Silicon detector (SVX): 5 double ided layer, η <2; Radiu: from 2.5 to 10 cm; L00 at r~1.5 cm; rift chamber (COT) 96 layer; η < 2; Radiu from 44 to 132 cm; Magnetic field 1.4 T; Muon identification trigger up to η < 1; Time-of-flight detector provide particle I 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 20

21 Ø detector for B phyic Silicon detector (SMT): 4 mainly double ided layer; η < 2; L0 at r=1.6 cm; Silicon Fibre Tracker (CFT): 8 layer, η < 2; Radiu: cm Muon ytem: 3 layer Toroid; Large acceptance η < 2.2; Scintillator layer for trigger; Comic ray rejection; Low punch-through; Local meaurement of muon charge and momentum; 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 21

22 Ø: Revering Magnet Polaritie Polaritie of Ø olenoid and toroid are revered regularly; Trajectory of the negative particle become exactly the ame a the trajectory of the poitive particle with the revered magnet polarity; Thi cancel the difference in the recontruction efficiency between poitive and negative particle; Toroid p p Change polaritie Eff μ Eff μ Toroid p μ Eff = Eff μ p Changing Magnet polaritie i an important feature of Ø detector, which reduce ignificantly the ytematic in CP aymmetry meaurement Toroid 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 22 p p Toroid p p

23 X imuon charge aymmetry B A b l N N b b 0 B q N N b b 0 B q X Both B d and B contribute in A b l : A = ( ± 0.022) a (0.494 ± 0.022) a b l a q l i the charge aymmetry of "wrong ign" emileptonic B 0 q (q = d,) decay: 0 0 Γ ( Bq μ X ) Γ ( Bq μ X ) q al ; q = d, 0 0 Γ ( B μ X ) Γ ( B μ X ) q d l q 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 23 l

24 ecay B J/ψ f 0 Thi decay can provide complementary information on the CP violation in B ytem The final ytem i a pure CP-odd Eigen-tate, and the angular analyi i not required to meaure the CP violation Thi decay wa firt oberved by the LHCb experiment, hortly followed by Belle confirmation Both Ø and CF collaboration confirm the obervation of thi decay 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 24

25 ecay B J/ψ f 0 All experiment report the meaurement of the branching fraction rate: R = 0 Br( B Br( B J / ψ f0 ) Br( f0 π π ) J / ψφ) Br( φ K K ) f0 / φ 0 R f R f / = ± ± 0 φ / = ± ± 0 φ (zero) (CF) In addition, CF alo meaure the B lifetime in thi tate: τ ( B CP - odd) = ± 0.03 p (CF) 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 25

26 Other CP aymmetry reult CP aymmetry in B φφ decay: CF : Au = ( 0.7 ± 6.4 ± 1.8)% A = ( 12.0 ± 6.4 ± 1.6)% v CP aymmetry in 0 decay: CF : A ( π π ) = ( 0.22 ± 0.24 ± 0.11)% A CP CP ( K K ) = ( 0.24 ± 0.22 ± 0.10)% Conitent with the recent claim by LHCb of the evidence of CP violation in 0 decay LHCb : ΔA CP = A CP ( K K ) ( π = ( 0.82 ± 0.21 ± 0.11)% A CP π ) CP aymmetry in 0 K S π π decay CF : = ( 0.05 ± 0.57 ± A CP 0.54)% 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 26

27 B J/ψ φ (CF) Calibration of ame-ide tagging 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 27

28 Comparion between experiment The comparion plot include the previou CF reult obtained with ~1/2 of tatitic The reult of CF and Ø agree with each other and with a recent meaurement by LHCb 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron 28

29 Summary New meaurement of Br(B 0,B μ μ )(CF): Br (B μ μ ) = (1.3 ) 10 Br (B 0 Firt double-ided limit on thi branching fraction: < Br (B μ μ ) < at 95% C.L New reult in B J/ψφtudy from CF and Ø Reult i conitent with the SM prediction 3.9σ deviation in the dimuon charge aymmetry (Ø): b A l μ μ ) < -9 < Br (B = ( ± (tat) ± (yt) )% CP aymmetry in 0 K K, π π decay (CF): 9 Conitent with the LHCb reult μ μ ) < ( ) at 95% (90%) C.L. 06 March 2012 G.Boriov, Heavy flavour reult from Tevatron CF : = ( 0.62 ± 0.21± 0.10)% ΔA CP at 90% C.L.

30 Summary (cont.) New meaurement of Br( B ) Br ( B ) = ± ± ± (norm) Tevatron experiment produced much more intereting reult in heavy flavour phyic See online web page of the CF and Ø experiment: March 2012 G.Boriov, Heavy flavour reult from Tevatron 30