HEAVY-FLAVOR SPECTROSCOPY IN ATLAS & CMS - - PowerPoint PPT Presentation

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HEAVY-FLAVOR SPECTROSCOPY IN ATLAS & CMS

Greg Landsberg

54th Rencontres de Moriond QCD, 26.03.2019

FERMILAB-SLIDES-19-016-CMS-E-PPD This document was prepared by [COLLABORATION NAME] using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE- AC02-07CH11359. This document was prepared by [CMS Collaboration] using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359.

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

Outline

๏B→K*μμ angular analysis and

prospects

๏CP Violation in the Bs →J/ψɸ decay ๏Angular analysis of the B→J/ψΛp decay ๏Spectroscopy of excited Bs and Bc

mesons

๏Conclusions

๏ N.B. All the references are clickable links

2

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

LHC Run 2: Big Success

๏ 160 fb-1 has been delivered by the LHC in Run 2 (2015−2018),

at a c.o.m. of 13 TeV, exceeding the original integrated luminosity projections

๏ Over 140 fb-1 of physics-quality data recorded by ATLAS/ CMS ๏ Thank you, LHC, for a spectacular run!

3

1 0Dy 1 Jun 1 JuO 1 AuJ 1 6eS 1 2ct 1 1ov 1 Dec

DDte (87C)

20 40 60 80 100

7otDO ,nteJUDted LumLnosLty (fb−1 )

DDtD included fUom 2015-06-03 08:41 to 2018-10-26 08:23 8TC 2015, 4.2 fb−1 2016, 41.0 fb−1 2017, 49.8 fb−1 2018, 68.2 fb−1 20 40 60 80 100

CMS ,ntegrDted LumLnoVLty DelLvered, SS,

s = 13 TeV

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B→K*µµ Angular Analysis

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

Angular Analysis B→K*µµ

๏ Recent ATLAS measurement, aimed at P'5 and

• ther angular coefficients

★ Based on 2012 8 TeV data, 20 fb-1 ★ Inspired by recent LHCb ~3.4σ hint of


a discrepancy in P'5 angular coefficient

★ Possible connection to the b→sℓ+ℓ- flavor anomalies

5

φ B0

d

µ+ µ− K+ π− θL θK

1 dΓ/dq2 d4Γ d cos θLd cos θKdφdq2 = 9 32π " 3(1 − FL) 4 sin2 θK + FL cos2 θK + 1 − FL 4 sin2 θK cos 2θL −FL cos2 θK cos 2θL + S3 sin2 θK sin2 θL cos 2φ +S4 sin 2θK sin 2θL cos φ + S5 sin 2θK sin θL cos φ +S6 sin2 θK cos θL + S7 sin 2θK sin θL sin φ +S8 sin 2θK sin 2θL sin φ + S9 sin2 θK sin2 θL sin 2φ # . (1)

]

4

c /

2

[GeV

2

q

5 10 15

5

' P

• 2
• 1

1 2

LHCb

SM from DHMV

P 0

5 =

S5 p FL(1 − FL)

<latexit sha1_base64="zUY0u1/34kM808y+8r+pRlj3Cdw=">A CDXicdVDLSgMxFM34rPV dekmWMW6sMz07UIoCuLCRUX7gLYMmT hmYeJhmhDPMDbvwVNy4UcevenX9jpq2gogfu5XDOvST3WD6jQur6hzYzOze/sJhYSi6vrK6tpzY2G8ILOCZ17DGPtywkCKMuqUsqGWn5nCDHYqRpDU9jv3lLuKCe y1HPuk6qO9Sm2IklWSmdmtmcR8ew47NEQ6vzGIUdsQNl+GZeZExDlU/iCIzldazR5VSrlC elbXy0bOiEmuXMgXoKGUG kwRc1MvXd6Hg4c4krMkB tQ/dlN0RcUsxIlOwEgvgID1GftBV1kUNENx fE8E9pfSg7XFVroRj9ftGiBwhRo6lJh0kB+K3F4t/e 1A2pVuSF0/kMTFk4fsgEHpwTga2KOcYMlGi DMqforxAOkcpEqwKQK4etS+D9p5LJGPmtcFtLVk2kcCbANdkAG KAMquAc1EAdYHAH sATeNbutUftRXudjM5o050t8APa2ycihZpe</latexit>

P'5

~3.4σ

LHCb, JHEP 02 (2016) 104

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

Fit Projections

๏ Four-dimensional fits in the m(K*μμ), ɸ, cosϴK,

and cosϴL variables

6

[MeV]

µ µ π K

m 5200 5400 5600 Events / 25 MeV 10 20 30

• 1

= 8 TeV, 20.3 fb s ATLAS

2

[2.0, 4.0] GeV ∈

2

S5 fold, q

Data Total Fit Model Signal Background

[rad] φ 1 2 3 π Events / 0.04 10 20

• 1

= 8 TeV, 20.3 fb s ATLAS

2

[2.0, 4.0] GeV ∈

2

S5 fold, q

Data Total Fit Model Signal Background

K

θ cos 1 − 0.5 − 0.5 1 Events / 0.08 10 20 30

• 1

= 8 TeV, 20.3 fb s ATLAS

2

[2.0, 4.0] GeV ∈

2

S5 fold, q

Data Total Fit Model Signal Background

L

θ cos 0.2 0.4 0.6 0.8 1 Events / 0.04 10 20

• 1

= 8 TeV, 20.3 fb s ATLAS

2

[2.0, 4.0] GeV ∈

2

S5 fold, q

Data Total Fit Model Signal Background

2 < q2 < 4 GeV2

m(K*μμ) ɸ cosϴK cosϴL

ATLAS, JHEP 10 (2018) 047

2012

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

Results vs. Theory

๏ P'5 results are in agreement with other

experiments and theory in the q2 < 6 GeV2 range

★ Deviation from the DHMV predictions is 2.7σ in the 


4 < q2 < 6 GeV2 bin

7

2 4 6 8 10

]

2

[GeV

2

q

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

L

F

Data CFFMPSV fit theory DHMV theory JC

ATLAS

• 1

= 8 TeV, 20.3 fb s

2 4 6 8 10

]

2

[GeV

2

q

0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8

5

S

Data CFFMPSV fit theory DHMV

ATLAS

• 1

= 8 TeV, 20.3 fb s

DHMV: JHEP 12 (2014) 125 JC: JHEP 05 (2013) 043, PRD 93 (2016) 014028 CFFMPSV: JHEP 06 (2016) 116 ATLAS, JHEP 10 (2018) 047

FL S5 P'5

2012 2012 2012

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

HL-LHC Projections

๏ Both ATLAS and CMS have


projected for the HL-LHC

★ CMS also has Run 3 projections

8

ATL-PHYS-PUB-2019-003

2 4 6 8 10

]

2

[GeV

2

q

1 − 0.5 − 0.5 1 1.5 2

5

P'

ATLAS JHEP 10 (2018) 047 CFFMPSV fit theory DHMV theory JC 6 µ 10 µ ATLAS HL 6 (stat. only) µ 10 µ ATLAS HL ATLAS Preliminary

• 1

= 14 TeV, 3000 fb s Projections from Run 1 data µ µ K* → B

ATLAS: x5-9 improvement in precision, depending on
 the trigger scenario (pTµ > 6,6; 10,6; and 10,10 GeV) pTµ > 10,6 GeV
 scenario

2 4 6 8 10 12 14 16 18 20

]

2

[GeV

2

q

1 − 0.5 − 0.5

5

P'

CMS PLB 781 (2018) 517 with Stat. uncert. only with YR18 syst. uncert.

• µ

+

µ

*0

K → B

CMS

Phase-2 Simulation Preliminary (14 TeV)

1 −

300 fb

• jected statistical (hatched regions) and total (open boxes) uncertainties

2 4 6 8 10 12 14 16 18 20 1 − 0.5 − 0.5

5

P'

CMS PLB 781 (2018) 517 with Stat. uncert. only with YR18 syst. uncert.

• µ

+

µ

*0

K → B

CMS

Phase-2 Simulation Preliminary (14 TeV)

1 −

3000 fb

2 4 6 8 10 12 14 16 18 20

0.1 − 0.1

unc.

Finer binning 2 4 6 8 10 12 14 16 18 20 ]

2

[GeV

2

q

0.1 − 0.1

unc.

CMS PAS FTR-18-033

CMS: Up to x15 improvement w/ 3 ab-1 compared 
 to the 8 TeV CMS result [PLB 781 (2018) 517] Run 3 300 fb-1 HL-LHC 3 ab-1

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CP Violation in the Bs → J/ψɸ Decay

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

CP Violation in Bs → J/ψɸ

๏ New analysis from ATLAS based on 2016+2017 13 TeV data (80.5 fb-1)

taken with a dimuon J/ψ trigger, combined with an earlier 7+8 TeV result

★ The trigger has been corrected for the time-time-dependence of the

efficiency for muons with large displacement

๏ Use opposite-side tagging (based on a combination of the lepton and

track-in-cone charge), calibrated with self-tagging B± → J/ψK± decays

★ A tagging efficiency of ε = 14.7% with an effective dilution of D = 33.4%

and tagging power εD2 = 1.7% has been achieved

★ 3.2M Bs → J/ψ(μ+μ-)ɸ(K+K-) candidates, 0.5M remains after tagging

๏ A maximum likelihood fit to data with 9 parameters, including ɸs, Γs,

ΔΓs is performed

10

φs = −0.076 ± 0.034 (stat.) ± 0.019 (syst.) rad ∆Γs = 0.068 ± 0.004 (stat.) ± 0.003 (syst.) ps−1 Γs = 0.669 ± 0.001 (stat.) ± 0.001 (syst.) ps−1

ATLAS-CONF-2019-009 0.664 ±0.004 (PDG) 0.083 ±0.006 (PDG)

• 0.021 ±0.031 (HFLAV)

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

ATLAS CPV Results

๏ The new data are consistent with an earlier ATLAS result ๏ The results are consistent within 2σ with the HFLAV/PDG

world-average values for these parameters

★ A significant improvement in the precision in Γs is achieved

๏ At 1σ level the new result it is also consistent with the LHCb

and CMS measurements

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0.4 − 0.2 − 0.2 0.4 [rad]

s

φ 0.06 0.08 0.1 0.12 0.14 ]

• 1

[ps

s

Γ ∆ ATLAS Preliminary = 7, 8, and 13 TeV s 68% CL contours

• 1

7 and 8 TeV, 19.2 fb

• 1

13 TeV, 80.5 fb

• 1

Combined 19.2 + 80.5 fb SM prediction

ATLAS-CONF-2019-009

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Study of the 
 B→J/ψΛp Decay

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Greg Landsberg - Heavy-Flavor Spectroscopy in ATLAS & CMS

Baryonic B Decays

๏ B → J/ψΛp is a rare baryonic decay of the B+ meson, observed in

2005 by Belle with a handful (17.2 ± 4.1) of events:

★ B(B- → J/ψΛp) = (11.6 ± 2.8+1.8-2.3) x 10-6

๏ Attempted to study the three two-body masses, but the results

were inconclusive because of a low signal yield

๏ Historically, rich potential way of looking for new resonances: 


the X, Y particles were discovered in the B → J/ψ + X decays

★ More recently LHCb saw two pentaquark 


candidates (P+c) in the Λb → J/ψ + X decays

13

Belle, PRD 72 (2005) 051105

1 2 3 4 5 6 7 8 4.2 4.3 (a) M (J/ψ,Λ)

Entries/10 MeV/c2

1 2 3 4 5 6 7 8 4 4.1 4.2 (b) M (J/ψ,p

–)

1 2 3 4 5 6 7 8 2 2.1 2.2 (c) M (Λ,p

–)

mass(GeV/c2) 5.3 2 4 6 8 10 12 14

• 0.1 -0.05

0.05 0.1 0.15 0.2

∆MB(GeV/c2) Ent./7.3 MeV/c2

B-→ J/ψ Λ p

–

B-→ J/ψΣ0 p

–

(b)

Belle, PRD 72 (2005) 051105