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Recent Results on Charm Hadrons from BaBar and Belle. Сессия Отделения Ядерной Физики РАН , Физика Фундаментальных Взаимодействий, ИТЭФ 27/11/07. Ruslan Chistov (ITEP). ▪ Introduction ▪ Evidence for D 0 -D 0 mixing ▪ Measurement of D s and f Ds - PowerPoint PPT Presentation
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Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)1
Recent Results on Charm Recent Results on Charm Hadrons from BaBar and BelleHadrons from BaBar and Belle
▪ Introduction ▪ Evidence for D0-D0 mixing ▪ Measurement of Ds and fDs
▪ Observation of new excited charm baryons c(3055/3123)+
▪ Summary
Ruslan Chistov (ITEP)
Сессия Отделения Ядерной Физики РАН , Физика Фундаментальных Взаимодействий, ИТЭФ 27/11/07
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)2
Recent Recent Results on Results on
Charm Charm Mesons :Mesons :
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)3
DD00-D-D00 mixing in the SM mixing in the SM
Unlike mixing in K0, B0 and B0s systems, D0 system provides test for neutral meson mixing with down type quarks in the box.
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)4
KK yxx sincos
2
22
4t
yxtRyRet DD
tWS
KK xyy sincos
Strong phase difference between CF and DCS
• Wrong sign (WS) hadronic decays e.g. K+ - ( K+ - 0, K+ - - + )t-dependent analysis required to disentangle mixing and DCS contributions
yCP= y if no CP violation
• Lifetime difference e.g. D0 K+K- (+) vs D0 K- + (0) 0/ + = 1 + yCP
RM = 1/2(x2 + y2) 2tRet M
tWS
• Wrong sign (WS) semileptonic decays D0 K+l-
• Dalitz plot analysis D0 KS - + t-dependent analysis: interference of DCS and mixing e.g. D0 K*+- CP final states e.g. D0 KS 0 (+)
DD00-D-D00 mixing: experimental methods mixing: experimental methods
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)5
DD00-D-D00 mixing: Status 2006 mixing: Status 2006
RM<0.040 %
D0 K+- Phys.Rev.Lett.96:151801,2006.
400fb-1
Wrong sign (WS) hadronic decays: K+ -, K+ - 0, K+ - - +
t-dependent analysisto disentangle mixing and DCS
Phys.Rev.Lett.97: 221803,2006.
D0 K+- 0
D0 K+- +-
230.4fb-1
Many hints of D0 D0 mixing: ~2.1 Belle D0K ~2.3 BaBar D0K2/K3 ~2.2 Average yCP (PDG’06)
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)6
DD00-D-D00 mixing mixingfrom BaBarfrom BaBar
384fb-1
hep-ex/0703020v1
403090candidates
WS
poin
ts:
data
– n
o-m
ixin
g fit
curv
e : ”
mix
ing
fit”
– “n
o m
ixin
g fit
”Fi
t with
mix
ing
is b
ette
r mat
ch to
dat
a!
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)7
DD00-D-D00 mixing from BaBar: Results mixing from BaBar: Results
mixing CL contours
3.9 no-mixing point
No CPV
x’2 and y’2 CL contours • calculated from the change in log likelihood • include systematic errors
x’2 = - (0.220.300.21)x10-3
y’ = (9.74.43.1)x10-3
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)8
DD00-D-D00 mixing at Belle: y mixing at Belle: ycpcp
Measure relative lifetime difference: D0 K-+ and D0 K+K- (+ -)
mixing parameter:
yCP= y· cos - 1/2AMx· sin CP conservation: AM = sin = 0 ; yCP= y = /
Search for CPV by measuring A = 1/2AMy· cos - x· sin
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)9
DD00-D-D00 mixing at Belle: y mixing at Belle: ycpcp results results
Visual demonstrationof non-zero y:
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)10
DD00-D-D00 mixing at Belle: mixing at Belle:Dalitz analysis D0 K0
S -+
Study self-conjugate decay
D0 K0S -+
t-dependence of Dalitz plot distribution provide direct access to x and y!!!
Decay amplitude assuming M = M (no CPV):
t - dependence is contained in
for D0 m2= m2(KS) , for D0 m2
= m2(KS)
Strong phase difference between CF and DCS amplitudes fixed by Dalitz fit!
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)11
Belle results on Belle results on Dalitz analysis D0 K0
S -+
disfavor no-mixing disfavor no-mixing x=y=0 pointx=y=0 point
with significance with significance 2.2 2.2
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)12
DD00-D-D00 mixing measurements mixing measurements averageaverage
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)13
Measurement of Ds+ + and fDs
at Belle
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)14
Reconstruction ofReconstruction of Ds+ +
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)15
Measurement of Ds+ + and fDs
at Belle (results)
!
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)16
Recent Recent Results on Results on
Charm Charm Baryons :Baryons :
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)17
Λc+K-π+
Ξc(3080)+
NEW Λc+K-π+
Ξc(2980)+
NEW Ξc(3080)+
Ξc(2980)+
Λc+Ksπ-
Ξc(3080)0 NEW
PRL97,162001
hep-ex/0607042
BaBar confirmed
Measurements of M and Γ are consistent
New decay mechanism: s-quark → meson
Observation of new excited Observation of new excited charm strange baryons at Belle charm strange baryons at Belle
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)18
Observation of Observation of ΞΞcc(3055)(3055)++ and Evidence for and Evidence for ΞΞcc(3123)(3123)++ at BaBar at BaBar
Ξc(3080)+
Ξc(3080)+
Ξc(2980)+
Σc(2455)++K-→Λc+K-π+
Σc(2520)++K-
Ξc(3055)+
NEW
Ξc(3123)+
evidence
hep-ex/... (preliminary)
For all new c
More experimental studies to assign JP.
Mass D-wave excitations ?Ξc(2980) 1/2+, 3/2+,.. Ξc(3080) 5/2+,..
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)19
Discussion of New Discussion of New cxcx States States
Observed Properties:Observed Properties: •Charm and strange quarks in the final state (Λc
+ and K-);•These new charm baryons have *large masses (largest in grand family of charm baryons), *finite widths;
•Neutral partners also observed not double charm baryonsnot double charm baryons
Most natural interpretation: excited charm strange baryonsexcited charm strange baryons
which could be D-wave excitations. Possible JP are 1/2+(or 3/2+) and 5/2+ (H.-Y.Cheng, C.-K.Chua, hep-ph/0610283; J.L.Rosner, hep-ph/0612332)
Note: Note: Not seen in M( Not seen in M(ΛΛcc++KK--) and M() and M(ΛΛcc
++KK--++--) spectra!) spectra!
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)20
Observation of cxcx(2980)(2980)+/0+/0 cc*0/+*0/++/- +/-
at Belleat Belle
Ξc(2815)+
Ξcx(2970)+
No Ξcx(3080)+
M(Ξc(2645)0π+) M(Ξc(2645)+π-)
??
Ξc(2815)0
Ξcx(2970)0
No Ξcx(3080)0
??
Search for another, “natural” channel for the new states cx
Pre
lim
inary
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)21
Observation of Observation of ΛΛcc(2940)(2940)++ and and ΛΛcc(2880)(2880)++DD00pp
c(2880)+
c(2940)+
BaBar Belle
M(M(ΣΣcc(2455)(2455)0,++0,++ππ±±))
c(2880)+
c(2940)+
New decay mechanism of excited New decay mechanism of excited ΛΛcc ! !
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)22
Study of Study of BB++→→ΛΛcc++ΛΛcc
--KK++ by by BaBarBaBar(preliminary)(preliminary)
Originally, B+→Λc+Λc
-K+ decay has been observed by Belle
BaBar: confirmation, resonant structure.BaBar: confirmation, resonant structure.
Λc+K-
BaBar “More data are needed before firm conclusions can be drawn.”
Excited Ξc? not seen in continuum
Λc+ Λc
- K-
mbc (GeV/c2)
NEW
PRL97,202003 (2006)
phase-space
sidebands
B mesonsignal
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)23
SummarySummary on New Charm Baryonson New Charm Baryons
c(2880)+ c and D0p (!), c(2940)+ mostly to D0p, (csuppressed)
cx(2980) c* and cK (cK),
cx(3080) only to cK (c(*)K),
(no signal for c*)
cK threshold
D0p threshold
New charm baryons with new decay mechanism were discovered by BaBar and Belle:
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)24
Summary Summary
• This year D0-D0 mixing results :• New D0K+- study at BaBar: 3.9 of (x’,y’) (0,0) (past year at Belle: 2.1 of (x’,y’) (0,0)• New Dalitz analysis D0 K0
S -+ at Belle: 2.7 of (x,y) (0,0)• New yCP measurement at Belle: 3.2 of y 0 (past year at BaBar: 1.9 of y 0)
● Combination of existing D0-D0 mixing results established at ~5σ
● New measurement of fDs fromBelle in good
agreement with previous results and LQCD ● A lot of new charm baryons observed : waiting interpretation from theory
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)25
Back up slidesBack up slides
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)26
Integrated luminosity
May ‘99
KEKB asymmetric-energyKEKB asymmetric-energy e e++ee-- collider and Belle detector collider and Belle detector
> 1 fb-1/day
e+e- Y(4S)
{ll, cc, qq}
Not only EWP and CP!
> 730 fb-1
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)27
Angular analysis of Angular analysis of DDs1s1(2536)(2536)++DD*+*+KK00
ss at Belle at Belle
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)28
RESULT:
Angular analysis of DAngular analysis of Ds1s1(2536)(2536)++DD*+*+KK00ss
at Belle (cont’d)at Belle (cont’d)
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)29
Mass D-wave excitations ?Ξc(2980) 1/2+, 3/2+,.. Ξc(3080) 5/2+,..
BaBar confirmed also Ξc(3080)0
Λc+K-π+
Ξc(3080)+
NEW
Λc+K-π+
Ξc(2980)+
NEW
Ξc(3080)+
Ξc(2980)+
Λc+Ksπ-
Ξc(3080)0 NEW
PRL97,162001
hep-ex/0607042
BaBar confirmed
Measurements of M and Γ are consistent
New decay mechanism:s-quark → meson.
More experimental studies to assign JP.
RosnerChen, Chua, PRD75, 094017Garcilazo, Vijande, Valcarce, JPG34, 961Chen, Chen, Liu, Deng, Zhu, PRD75, 094017Ebert
Observation of Observation of new excited charm strange baryonnew excited charm strange baryon
at Belle and BaBar at Belle and BaBar
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)30
Observation of Observation of ΞΞcc(2980) and (2980) and ΞΞcc(3080) (3080) by Belle by Belle
resonant structure
Mass D-wave excitations ?Ξc(2980) 1/2+, 3/2+,.. Ξc(3080) 5/2+,..
BaBar confirmed also Ξc(3080)0
Λc+K-π+
Ξc(3080)+
NEW
Λc+K-π+
Ξc(2980)+
NEW
Ξc(3080)+
Ξc(2980)+
Λc+Ksπ-
Ξc(3080)0 NEW
PRL97,162001 hep-ex/0607042
BaBar confirmed
Measurements of M and Γ are consistent
New decay mechanism:s-quark → meson.
More experimental studies to assign JP.
RosnerChen, Chua, PRD75, 094017Garcilazo, Vijande, Valcarce, JPG34, 961Chen, Chen, Liu, Deng, Zhu, PRD75, 094017Ebert
Ruslan Chistov ▪ Recent Results on Charm hadrons from BaBar and Belle (27/11/07, ITEP)31
::