Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://qfthep.sinp.msu.ru/talks2013/skovpenQFTHEP.pdf Äàòà èçìåíåíèÿ: Sat Jun 29 17:02:49 2013 Äàòà èíäåêñèðîâàíèÿ: Thu Feb 27 20:15:04 2014 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: m 35

BABAR latest results, focusing on CP violation and on rare processes probing the SM and BSM
Yu.I.Skovp en BINP, Novosibirsk

On behalf of the BaBar Col laboration
The XXI International Workshop High Energy Physics and Quantum Field Theory June 23-30, 2013 Saint Petersburg Area, Russia

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

1


PEP II e+ (3.1 GeV) e- (9.0 GeV) = 0.56

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

2


Ba Ba r col lecting data from 1999 to 2008

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

3


Ba Ba r
As of 2008/04/11 00:00

Integrated Luminosity [fb -1]

BaBar Run 1-7
500
PEP II Delivered Luminosity: 553.48/fb BaBar Recorded Luminosity: 531.43/fb BaBar Recorded Y(4s): 432.89/fb BaBar Recorded Y(3s): 30.23/fb BaBar Recorded Y(2s): 14.45/fb Off Peak Luminosity: 53.85/fb

400

300

Delivered Recorded Recorded Recorded Recorded Off Peak

Luminosity Luminosity Luminosity Y(4s) Luminosity Y(3s) Luminosity Y(2s)

200

L 430 f b-1 (4S ) and 45 f b-1 40 M eV b elow (4S ) ¯ · 470 M B B R · total L 550 f b-1 · R · > 500 publications · 30/y in present time

100

0
2000 2001 2002 2003 2004 2005 2006 2007 2008

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

4


Outline
¯ · C P violation in B 0 B 0 mixing · C P violation in B 0 ( )0 , Dalitz plot analysis · Direct C P violation with B · Observation of T-violation · B + · BK · BD
() - ±

D

()

K

()±

and B 0 +

-

decays

and invisible J / , (2S ) decays ¯ ¯ ¯ decay

· Direct asymmetry in B Xs decays
()

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

5


¯ C P violation in B 0 B 0 mixing

_ b q t

W W

+ -

_ q t b

_ b q W

_ t t W

_ q b

· (H ) = (M ) - i/2()
¯ < B 0 |H |B 0 >= M12 - i2 /2 1 0 ¯ 0 >= M12 - i12 /2 < B |H |B

· CPV in mixing ¯ ¯ P (B 0 B 0 ) = P (B 0 B 0 ) · CP asymmetry A
2 CP 0 0

=

¯ ¯ · | < B 0 |H |B 0 > |2 - | < B 0 |H |B 0 > | = 2I m(M12 12 ) ¯ · |BL = p|B 0 + q |B 0 ¯ |BH = p|B 0 - q |B 0

N (B 0 B 0 ) - N N (B 0 B 0 ) + N

¯ (B ¯ (B

¯ B0 ) = ¯ B0 )

1 - |q /p|4 1 + |q /p|4 " "2 M12 - (i/2) q · = p M12 - (i/2)

12 12

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

6


¯ C P violation in B 0 B 0 mixing
Usually measured asymmetry using semileptonic B decays A
SL

N (l + l + ) - N (l - l - ) 2 2 = ++ - - O (mc /mt ) N (l l ) + N (l l )

¯ · Ad L is measured with (4S ) B 0 B 0 S HFAG average of CLEO, BaBar, Belle A d L = ( - 0 .0 5 ± 0 .5 6 ) % S SM Ad L = (-4.1 ± 0.6) · 10-4 S · hadronic colliders measure Ab L which is combination of A S D0 result (Phys. Rev. D84, 052007 (2011)) on charge dimuon asymmetry differs by 3.9 A b L = ( - 0 .7 8 7 ± 0 .1 7 2 ± 0 .0 9 3 ) % S + SM Ab L = (-2.8-0.5 ) · 10-4 S 0.6 · As L = (-0.24 ± 0.54 ± 0.33% (LHCb) S A s L = ( - 1 .1 2 ± 0 .7 4 ± 0 .1 7 % ( D 0 ) S SM As L = (1.9 ± 0.3) · 10-5 S
d SL

and A

s SL

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

7


¯ C P violation in B 0 B 0 mixing

Dtag K soft

New approach is used in BaBar analysis
z Btag Brec D0

A

CP

=

N (l + K + ) - N (l - K - ) N (l + K + ) + N (l - K - )

Tag K l

· partial reconstruction using and the soft from D + D 4-momentum estimated

¯ only the lepton from B 0 D ¯ D0 + from sof t kinematics

+ -

l ¯

· K-tagging determines the flavor of the other B

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

8


¯ C P violation in B 0 B 0 mixing
· 0 .0 6 < p < 0.19 GeV /c, 1.40 < pl < 2.30 GeV /c

so f t

· K selection by means of energy loss and Cherenkov detector information pK > 0.2 GeV /c · continuum and combinatorial background suppressed by Fox-Wolfram moments and vertex probability

· sample comp osition is derived from a fit to 2 M by floating D , D 2 M = (Ebeam - ED - El )2 - (pD + pl )2

· combinatorial background using MC shap es and continuum shap es from off-p eak events · residual p eaking fixed from simulation

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

9


¯ C P violation in B 0 B 0 mixing
- + N (l + KT ) - N (l - KT ) = - A + N (l + KT ) - N (l + KT )

A A

T

rl

+A

K

+A

CP

R

- + N (l + KR ) - N (l - KR ) = - A + N (l + KR ) - N (l + KR )

rl

+A

K

+A

CP

d

d = 0.1862 ± 0.0023 · KR lept KR KT ·A
rl

ca on is is

n come from the Cabibb o-Favored decays of D 0 pro duced with the from the partially reconstructed side usually emitted in hemisphere opp osite to l pro duced randomly
K

and A

are detector induced asymmetries

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

10


¯ C P violation in B 0 B 0 mixing
preliminary results arXiv:1305.1575[hep-ex], submitted to PRL

AC P from binned four dimensional fit to cos unmixed l± K and mixed l± K ± · BaBar A d L = ( 0 .0 6 ± 0 .1 7 S 1 - |q /p| = (0.29 ±

lK

, z , (t), p

K

on 4 samples:

+0.36 -0.32 )% + 0.84-1.78 1.61

· consistent with previous measurement ) · 10
-3

· consistent with SM

· most precise measurement Yu.I. Skovpen, QFTHEP-2013, June 30, 2013 11


C P violation in B 0 ( )0 , Dalitz plot analysis

Motivation · CP violation in B 0 + - dominated by B 0 ± · precision measurement = ar g [-Vtd Vt /Vud Vub ] b · increased 346f b-1 dataset,
0

Selection · measured energy of the B candidate b etween 4.99 and 5.59GeV · mE S b etween 5.288GeV /c2 NN selection
-1

5 .2 0 0

and

Up dated by 2007 BaBar analysis 431 f b and vs.

· Legendre moment L0, L2

· improved tracking identification · reoptimized cuts

particle

· angle b etween the b eam axis and the B momentum or the B thrust axis

· more rigorous study of the lineshap e systematic uncertainties

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

12


C P violation in B 0 ( )0 , Dalitz plot analysis
¯ Time-dep endent amplitudes for B 0 and B 0 decays
A3 = A3 = A±,0 c f+ A+ + f- A- + f0 A0 f+ A+ + f- A- + f0 A0 orresp onds ±,0 -|t|/ 0 " ± B |A3 |2 + |A3 |2 |A3 (t)|2 = e 4 0 B " " 2 cos(m t) 2 - |A |A3 | 3 | d i " h q A3 A3 sin(md t) ±2 Im p + - ¯ B 0 ( A3 ) o r B 0 ( A3 ) · A quantifies direct CP violation · S parameterize mixing-induced CP violation related to · C parameterize flavor-dep endent direct C P violation · C asymmetry b etween rates (B 0 + - ) + (B 0 - + ) a n d (B 0 - + ) + (B 0 + - ) · S relates to the strong-phase difference b etween the different amplitudes

Fitting · · · mE S , E , NN output time dep endent DP 26 free parameters

f

e-|t|/ ± (t) = (1 ± A ) Qtag 4 h â 1 + Qtag (S ± S ) sin(md t) i -Qtag (C ± C ) cos(md t) ,

¯ Qtag = +1(-1) for Btag = B 0 (B 0 )

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

13


C P violation in B 0 ( )0 , Dalitz plot analysis
preliminary results arXiv:1304.3503[hep-ex], submitted to Physical Review D

isospin-constrained unconstrained

A

+ = -0.12 ± 0.08-0.04 A 0.05 C = 0 .0 1 6 ± 0 .0 5 9 ± 0 .0 3 6 , C = 0 .2 3 4 ± 0 .0 6 1 ± 0 .0 4 8 S = 0 .0 5 3 ± 0 .0 8 1 ± 0 .0 3 4 , S = 0 .0 5 4 ± 0 .0 8 2 ± 0 .0 3 9

+- -+

=

0 .0 9

+0.05 -0.06

± 0 .0 4

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

14


Direct C P violation with B

±

D

()

K

()±

î


û â

ö
¼

û


¼

û
b cus ¯ interference b etween b cus and b ucs ¯ ¯ dep ends on · weak phase = ar g [-Vud Vub /Vcd Vcb ] · relative strong phase ·r
B B

û

î û



â

ö

b ucs ¯ · the three approaches employed by the B factory exp eriments · the combination of these approaches were used in this analysis

= |A(b ucs)/A(b cus)| ¯ ¯

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

15


Direct C P violation with B

±

D

()

K

()±

· Dalitz plot or Giri-Grossman-Soffer-Zupan (GGSZ) metho d, based on three-b o dy, self-conjugate final states, such as KS + - ± (m2 , m2 ) |A± |2 + r + -
() () 2 B± 2 s±

|A |2 + 2 Re[z

() ±

A A ] for B ±
±

±

D

()

K

±

s (m2 , m2 ) |A± |2 + 2 r + - ±

|A |2 + 2 Re[z
±

s±

A A ] for B ±

DK

±

0 0 m2 = m2 (KS h- ), m2 = m2 (KS h+ ), A + -

A(m2 , m2 ) ±

· Gronau-London-Wyler (GLW) metho d, based on decays to CP-eigenstate final states, such as K + K - and KS 0 A
() CP ± () CP ±



() () K+ ) K - )-(B + D (B - D CP ± CP ± () () K+ ) K - )+(B + D (B - D CP ± CP ±

=±

() () x -x - + () |2 ±(x() +x() ) 1+|z - + () 2

R

2

() () (B - D K - )+(B + D K+ ) CP ± CP ± (B - D ()0 K - )+(B + D()0 K + )

= 1 + |z

| ± (x- + x+ )

()

()

· Atwo o d-Dunietz-Soni (ADS) metho d, based on D decays to doubly-Cabibb o-suppressed final states, such as D 0 K + - () ± h K) (B ± [K ± ] () () 2 () 2 D = r ± + rD + 2rD x± cos D - y R± ()
(B ± [K ± ] B± 2 D K± ) B

() ±

s in

D

R

K 0 ±

i

=r

+r

2 K 0

+ 2

K 0 K 0

r

^ â x± cos

K 0

-y

±

s in

K 0

~ 16

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013


Direct C P violation with B
y±
0.4

±

D

()

K

()±

y± *

0.4

y

s±

0.2 0.2

0.2 0 -0.2 -0.4

GGS Z Two-dimensional contours up to three standard deviations. T h e b lu e an d red contours corresp ond to B - and B + decays.

0

0

-0.2 -0.2 -0.2 0 0.2 -0.4 -0.4
±

x

-0.2

0

0.2

x± *

0.4

-0.4

-0.2

0

0.2

0.4

x

s±

y±

0.4

y± *

0.4

0.2

0

0

y

s±

0.2

0.2 0 -0.2 -0.4

GGSZ and GLW

-0.2 -0.2 -0.2 0 0.2 -0.4 -0.4
±

x

-0.2

0

0.2

x± *

0.4

-0.4

-0.2

0

0.2

0.4

x

s±

y±

0.4

y± *

0.4

0.2

y

s±

0.2

0.2 0 -0.2 -0.4

0

0

GGSZ, GLW, and ADS combination

-0.2 -0.2 -0.2 0 0.2 -0.4 -0.4
±

x

-0.2

0

0.2

x± *

0.4

-0.4

-0.2

0

0.2

0.4

x

s±

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

17


Direct C P violation with B
Combined GGSZ, GLW, ADS · = (6 9 = (6 8
+17 -16 ) +15 -14 ) +16.6 -15.7 )

±

D

()

K

()±

(Belle) and = (71.1

(LHCb)

· uncertainty is dominated by the statistical comp onent · exp erimental and amplitude-mo del systematic uncertainties amounting to ±4 · two-standard-deviation region is 41 < < 102 Phys. Rev. D 87, 052015 (2013)


· result is inconsistent with = 0 with a significance of 5.9 standard deviations

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

18


Observation of T-violation
T transformation is antiunitary v -v and exchange of in and out states · P violation in nuclear decay (T.D.Lee, C.N.Yan, C.S.Wu et.al., 1957) · CP violation in K
0

mesons (J.W.Cronin et.al., 1964)

· CP violation in B 0 mesons (BaBar and Belle, 2001) (4S ) decay yields an entangled state of B mesons ´ 1` ¯ ¯ · |i >= B 0 (t1 )B 0 (t2 ) - B 0 (t1 )B 0 (t2 ) 2 ¯ ¯ Flavor tag: semileptonic decay to l- X (l+ X ) pro jects B 0 (B 0 ) B 0 (B 0 ) tag 1 · |i >= (B+ (t1 )B- (t2 ) - B- (t1 )B+ (t2 )) 2 CP tag: B decay to J / KL pro jects B+ B- tag and B decay to J / KS pro jects B- B+ tag

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

19


Observation of T-violation
T-transformed pro cesses 4 indep endent T comparisons B 0 B+
0 (l - , J / K L ) 0 (l - , J / K S ) 0 (l + , J / K L ) 0 (l + , J / K S )

B 0 B- ¯ B 0 B+ ¯ B 0 B-

B+ B

0 0 0 0

0 (J / K S , l + ) 0 (J / K L , l + ) 0 (J / K S , l - ) 0 (J / K L , l - )

B- B ¯ B+ B

¯ B- B

4 indep endent CP comparisons 4 indep endent CPT comparisons

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

20


Observation of T-violation
Signal sample · select B candidates using b eamenergy substituted mass and energy difference q 2 mE S = Ebeam - p2 B E = EB - Ebeam reconstructed mo des

cc K ¯

S

· background rejection: veto es to B background and suppress continuum using event shap e variables

cc K L ¯ Bf lav

or

B B B B B B
Events / 2 MeV

0

0 0 0 0 0



J / KS ( 2 S )K S c1 KS J / KL D (, a1 ) J / K 0

Events / 2 MeV/c2

a)
2000

1000

b) B J/ K
0 L

1000

B J/ K0 S B (2S)K B c1K0 S

0 S

500

0 5.2

0 5.22 5.24 5.26 5.28 0 20 40

m
7796 events purity 87-96%

ES

(GeV/c2)
5813 events purity 56%

E (MeV)

60

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

21


Observation of T-violation Fit to signal parameters
8 time-dep endent decay rates h ± ± -|t| g, (|t|) e 1 + S, sin(md |t|) + C ± - t > 0, < 0 , - flavor, CP reco
± ,

cos(md |t|)

i

¯ · for example B 0 B- (l+ , KS ) is characterized by S

+ l+ ,KS - l- ,KL

¯ · T reversed transition B- B 0 (KL , l- ) is characterized by S · parameter of T violation: S (S
- T + T

=S

=S

+ l- ,KL

-S

- l+ ,KS

- l- ,KL

-S

+ l+ ,KS

)

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

22


Observation of T-violation Results
C± CP
± CT

0.5

0.5

C± CPT

1

1

1

0.5

0

0

0

-0.5

-0.5

-0.5

-1

-1

0

1



S± T

-1

-1

0

1

-1



S± CP

-1

0

1

S± CPT

C

+

vs. S

+

and C

-

vs. S
-2

- -3

1 - C L = 0 .3 1 7 , 4 .5 5 â 1 0

, 2 .7 0 â 1 0

, 6 .3 3 â 1 0

-5

, 5 .7 3 â 1 0

-7

, 1 .9 7 â 1 0

-9

Significance of T violation 14 , CP violation 17 , CPT violation 0.3 FIRST DIRECT OBSERVATION OF T VIOLATION Phys. Rev. Lett. 109, 211801 (2012)

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

23


B +

-

and B 0 +

-

decays

+ Z 0, W- b u, c, t - d
b u, c, t W-

-

+

· flavour-changing neutral current b d · forbidden at tree level in SM

¯

W+ d

· predicted fraction 10

-8

· LHCb B + + µ+ µ- B r = ( 2 .3 ± 0 .6 ± 0 .1 ) · 1 0

-8

Event selection · pl > 0.3 GeV /c · 115 < m
2 0

· 0.03 < mll < 5 GeV /c

· lepton pair and hadron are fit to common vertex · mE
S

< 150 M eV /c2 for
0

> 5.1 GeV /c

2

· 500 < m < 575 M eV /c2 535 < m3 < 565 M eV /c2 for

· reconstruction and + -

· B J / X and B (2S )X reject events with mll near J / and (2S ) masses

· -300 < E < 250 M eV

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

24


B +

-

and B 0 +

-

decays

Event selection: NN to reject combinatorial background Variables for continuum NN · Fox-Wolfram moments · p olar angle of thrust axis of event ¯ Variables for B B NN · mE
S

and E
t

· p olar angle of thrust axis of rest of event (ROE) Pj i · Lj = k pk c o s i · p olar angle of B candidate · probability of vertex fit

· to ta l P

· missing energy

· momentum ROE b eam direction · momentum thrust axis ROE

transverse transverse

to to

· p olar angle of B candidate · probability of vertex fit

Also some set of tune cuts for angles and momenta of particles To select the b est candidate the follwing ratio is used P (x) + P
sig (x) BB sig cont (y ))

LR (x, y ) =

(P

sig BB

+P +(

sig cont (y ) P bkg (x) BB

+P

bkg cont

(y ))

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

25


B +
preliminary
Mo de + + e+ e- B B 0 0 e+ e- B 0 e+ e- B 0 B 0 3 e+ e+ 0.207 0.166

-

and B 0 +

-

decays

Yield +5.7 4.2 -4.6 +4.2 1.0 -3.2 +3.1 -1.2 -2.4 +1.2 -0.5 -0.9 +3.1 -2.3 +3.0 -0.2 -2.0 -0.5 +1.9 -0.4 -1.3 +0.6 -0.1 -0.4

e- e-

0.166 0.111 0.149 0.121

B (10-8 ) +5.9 4.3 ± 2.0 -4.3 +5.4 1.3 ± 0.2 -4.1 +10.0 -4.0 ± 0.6 -8.0

Upp er Limit (10-8 ) 12.5 8.4 10.8

B + + µ+ µ- B 0 0 µ+ µ- B 0 µ+ µ- B 0 µ+ B 0 3 µ+

µ- µ-

0.104 0.063

+4.4 ± 0.9 -3.2 +5.3 -0.3 ± 0.6 -3.6 +10.0 -2.0 ± 0.4 -6.6 -0.7

5.5 6.9 11.2

B e+ e- B µ+ µ- B + + + - B 0 0 + - B 0 + - B + -

+5.1 ± 1.6 -4.3 +4.1 -0.7 ± 1.2 -3.1 4.0 +3.6 ± 1.2 -3.0 +3.7 0.5 ± 0.3 -2.9 1.6 +6.6 -2.8 ± 0.3 -5.2 +3.2 1.6 ± 1.0 -2.7

11.0 5.0 6.6 5.3 6.4 5.9

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

26


B +

-

and B 0 +

-

decays

· observe no statistically significant signal · lepton-flavor and isospin averaged upp er limit at the 90% CL B(B + - ) < 5.9 â 10-8 factor of three of the SM exp ectation. · upp er limits have also b een calculated for different + - mo des · B ( B 0 + - ) < 6 .4 â 1 0
-8 -

· upp er limits have also b een calculated for different + · lowest upp er limits to date for B 0 + · first search for the decays B 0 +
- -

mo des

arXiv:1303.6010[hep-ex], submitted to Phys. Rev. D

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

27


BK

()

and invisible J / , (2S ) decays ¯ ¯ ¯

Z W b u, c, t
-

s b u, c, t
c

W
+

W

-

· flavour-changing neutral current b s · forbidden at tree level in SM

s

g ~ c c ~
Z
0

c
Z
0

c

g ~

c



g ~

c

g ~

· lowest-order diagrams of SM decay cc into and SUSY decay into pair of ¯ ¯ goldstinos · SM predicts B r (B + K + = B r (B 0 K 0 = (4.5 ± 0.7) · 10-6 ¯ ¯ + + + 0 0 B r (B K = B r (B K = (6.8-1.0 ) · 10-6 ¯ ¯ 1.1 B r ( J / ) = ( 4 .5 4 · 1 0 ¯
-7

) · B r (J / l + l - )

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

28


BK

()

and invisible J / , (2S ) decays ¯ ¯ ¯
Entries/(1 MeV/c2)
â103 35 30 25 20 10 5 0 5.2
5.21 5.22 5.23 5.24 5.25 5.26 5.27
Signal Region

· Btag reconstructed in one of many hadronic final states · require purity greater than 68% 448 final states · -0.12 < E < 0.12 GeV · 5.273 < mE
S

Sideband Region

15

< 5.290 GeV

mES [GeV/c2]

5.28

5.29

Continuum background is suppressed by using multivariate likeliho o d selector Six input is six event-shap e variables · · angle b etween Btag momentum and · b eam axis · · Btag thrust · Bt
ag

channels B K B
+

()

¯

B 0 KS ¯

K+ ¯

thrust along b eam axis

· angle b etween missing momentum and b eam axis · second-to-zeroth Fox-Wolfram moment

· B 0 K 0 ¯ K 0 K + - and K

B + K + ¯ K + K + 0 and K

+

KS KS

+

0

0

0 : 100 < m < 160 M eV /c KS : ±7 M eV /c2 of nominal K : ±70 M eV /c2 of nominal

2

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

29


BK

()

and invisible J / , (2S ) decays ¯ ¯ ¯

Phys. Rev. D87, 112005 (2013)
Entries/(0.1)

15 10 5 0 15 10 5 0 15 10 5 0 20 15 10 5 0 B + K* + B 0 K 0 B + K +

· combinatorial (shaded) mE S p eaking (solid) · signal MC (dashed) ¯ B r (B + K + ) = 2 0 · 1 0 other mo des 50 · 10-5
-5

·s

B

= m2 /m2 B ¯

· events to the left of the vertical line are selected to obtain limits Results

B 0 K* 0

· 0 < sB < 0.3 signal region to calculate upp er limits
s 1
B

0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

· B r ( B K ) < 3 .2 · 1 0 ¯
-3

-5 -5

· B r ( B K ) < 7 .9 · 1 0 ¯

B r ( J / ) < 3 .9 · 1 0 ¯

-3

and B r ( (2S ) ) < 15.5 · 10 ¯
-2

BES: B r (J / ) < (1.2 · 10 ¯

) · B r (J / µ+ µ- ) 90% CL 30

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013


Direct asymmetry in B Xs decays

·A

CP

=

· I m [(Vub Vus )/(Vtb Vt ] s

bs - ¯s b¯ bs + ¯s b¯

· A · A

Xs Xs

=A

- Xs

-A /C

0 Xs

· - 0 .6 % < A S M < 2 .8 % CP long distance dominated

· electro-magnetic C7 and chromo-magnetic C8g dip ole op erators are real in SM · A
Xs

I m(C

8g

7

)

· AC P (av er ag e) = -(1.2 ± 2.8)% BaBar, Belle, CLEO

= 0 in SM

38 of exclusive decays were reconstructed

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

31


Direct asymmetry in B Xs decays

· 38 final states

· (*) in CP measurement 10 charged and 6 neutral · 0 and decays to 2 E > 30 M eV for 0 E > 50 M eV for
· 1.6 < E < 3.0 GeV - 0 . 7 4 < c o s < 0 . 9 3

· 0.6 < mXs < 3.2 GeV /c · mE
S

2

> 5.24 GeV /c

2

· | c o s

· |E | < 0.15 GeV
T r oe-

| < 0 .8 5

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

32


Direct asymmetry in B Xs decays
Continuum background (random forest classifier) · all p h oton s to reject h igh en ergy p h oton from 0 · momentum flow in 10 increments ab out reconstructed B · up to second Legendre monomials along photon axis of ROE · angle b etween B and b eam axis · angle b etween trust axis of B and ROE · angle b etween photon and thrust axis of ROE

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

33


Direct asymmetry in B Xs decays

· A C P = ( 1 .7 ± 1 .9 ± 1 .0 ) % uncertainty smaller than current world average · AXs = (5.0 ± 3.9 ± 1.5)% the first measurement

0.07 I m(C8g /C7 ) 4.74 68% CL -1.64 I m(C8g /C7 ) 6.52 90% CL preliminary results

~ all p ossible values of 7 Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

8

34


BD
· SM rate well predicted, 2%
()

()

decay

B r (B D () ) · R (D ) = B r (B D () l ) indep endent of |Vcb | and to large extent of parametrization of hadronic matrix elements · SM uncertainty for R(D ) 6% and for R(D ) 2% · charged Higgs contributions at tree level · sensitive to vector vs. scalar current

· many common factors in decay rate to e, µ,

· reconstruct only - e- e and ¯ - - µ µ ¯

· fully reconstructing Btag mE S > 5.27 GeV /c2 |E | < 0.072 GeV · Bsig : D () , lepton and (missing energy)


· first obseved by Belle in 2007 Phys.Rev.Lett. 99 (2007) 191807

-

W - /H

-

B{

b q

c q

}D

()

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

35


BD

()

decay

3 12 1 0 0 2 2" G2 |Vcb |2 p () q 2 " 3 m2 m m2 F A D A 4 |H |2 + |H |2 ] + |H0 |2 @1 + @1 - = + |Hs |2 5 + - 2 3 m2 2 2 2 dq 96 q 2q 2q B d

· H± , H0 - Helicity amplitudes common to e, µ, · only H0 affects D (e, µ, ) decays · Hs only relevant for D l
d/dq2 (1016 GeV -1)

R (D

()

)

SM

=

(

0 .2 5 2 ± 0 .0 0 3 ( D ) D l

0 .2 9 7 ± 0 .0 1 7 ( D )

15 10 5 0 0

D

()

e

d/dq2 (1016 GeV -1)

(a)

(b) 20 10 0 0
q

D

()

µ

D

()



5
q
2

10
2

5
2

10
2

( G eV )

( G eV )

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

36


BD

()

decay
· |costh | < 0.8, th angle b etween thrust axes Btag and Bsig ·p · q 2 > 4 GeV
m is s 2

· pe > 0.3 GeV /c and p 0.2 GeV /c

µ

>

· D0 K - + , K - K + , K - + 0 , K - + - + , KS + - · D+ K - + + , K - + + 0 , KS + , KS + + - , KS + 0 , K + + ·D ·D
+ 0

> 0.2 GeV n tree multivariate riables: mD() , mD - Btag , mD -
t ag ag

D0 0 , D0

D0 + , D+

0

· b o osted decisio metho d with va Eextra , E , mD , mass of

mDtag , charge multiplicity of Bt costh

,

To extract signal from a fit to two dimensional distribution m2 m

is s

vs. p

l

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

37


BD
Phys. Rev. Lett. 109, 101802 (2012)
1 2 3 4 5

()

decay

0.4
R(D )

0.3

· excess over the SM predictions for R(D ) and R(D ) of 2.0 and 2.7 · R(D () )th = R(D () )SM probability of 6.9 â 10-4 SM predictions is excluded at the 3.4

SM
0.2 0.4
R(D)

0.6

Belle 2007 BaBar 2008 Belle 2009 Belle 2010 BaBar 2012

· R(D ) = 0.332 ± 0.024 ± 0.018 R(D )SM = 0.252 ± 0.003
0.2 0.4
R(D)

· R(D ) = 0.440 ± 0.058 ± 0.042 R(D )SM = 0.297 ± 0.017

0.6

0.8

0.3

0.4
R(D )


0.5

0.6

average of the previous measurements (shading)

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

38


BD
Two-Higgs-Doublet Mo del (2HDM)

()

decay

~ 4GF Vcb ^ (cµ PL b)( µ PL ) + SL (cµ PL b)( µ PL ) + SR (cµ PR b)( µ PL ) ¯ ¯ ¯ ¯ ¯ ¯ 2 ,, « q2 2 S H s H D M H s M · 1 + (SR ± SL ) m (mb mc ) Hef f =

typ e I I I : S typ e I I : S

R

and S

L

indep endent complex parameters
±

R

= -mb m tan /mH D l

and S

L

=0 D l
d/dq2 (GeV -1 )

d/dq2 (GeV -1 )

2 1.5 1 0.5 0

(a)

2 1.5 1 0.5

(b)

4

6
q
2

8
( Ge V )
2

10

12

0

4

6
q
2

8
( Ge V )
2

10

12

SM tan /mH ± = 0.3GeV
-1

tan /mH ± = 0.5GeV tan /mH ± = 1GeV

-1

-1

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

39


BD
exp erimental result theoretical prediction
0.8 0.6
R(D )

()

decay

2HDM typ e I I

100

0.4
tan

0.2 0 0.4
R(D )

0.2

0.4

0.6

0.8

1

50

Excl. at
3 4 5

0.3 0.2 0

0
0.2 0.4 0.6 0.8 1
tan /mH ± (GeV-1 )

200

400

600

800

1000

mH ± (GeV)
Level of disagreement

· tan /mH R(D )

· tan /mH R(D )

±

= 0.44 ± 0.02 GeV = 0.75 ± 0.04 GeV

-1

±

-1

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

40


BD
2HDM typ e I I

()

decay
preliminary
D

arXiv:1303.0571[hep-ex], submitted to PRD
D

2: 15.1/14, p = 36.9%

2: 11.0/14, p = 68.6%

D

2: 44.5/14, p = 0.0049%

Weighted events/(0.50 GeV2)

Weighted events/(0.50 GeV2)

50

50

Weighted events/(0.50 GeV2)

50

0

0

0

: 6.6/12, p = 88.4%
50

5 2

10
D

: 6.7/12, p = 87.6%
50

5 2

10
D

: 8.1/12, p = 77.4%
50

5 2

10
D

0 5

0

0 5

q 2 (GeV2 )

10

q 2 (GeV2 )

10

5

q 2 (GeV2 )

10

Efficiency corrected q 2 distributions for D (top) and D (b ottom) events with m2 iss > 1.5 GeV 2 scaled to the results of the isospin-constrained fit. m Left: SM. Center: tan /mH ± = 0.30 GeV -1 . Right: tan /mH ± = 0.45 GeV -1 . The uncertainty on the data p oints includes the statistical uncertainties of data and simulation. Yu.I. Skovpen, QFTHEP-2013, June 30, 2013 41


BD
2HDM typ e I I I preliminary

()

decay

Favored at 2
SR + SL

1 2 3
· favored regions for real values of SR and SL · b ottom two solutions are excluded by the measured q 2 sp ectra with significance of at least 2.9

0 -2 -6 -4 -2
SR - SL

0

2

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

42


Summary

· BaBar finished col lecting data five years ago but the col laboration continues to publish new results · the current publication rate is about 30 journal publications per year · many analysis in progress

Yu.I. Skovpen, QFTHEP-2013, June 30, 2013

43