Measurements with doubly-charmed hadronsAlso signiﬁcant in 2012 and consistent with 2016 data Signal yield: 113 ± 21 PRL 119 (2017) 112001 !15 Local signiﬁcance > 7& ++) [MeV/c2]

!1

Measurements with doubly-charmed

hadronsDaniel Vieira

University of Chinese Academy of Sciences On behalf of LHCb collaboration

9th International Workshop on Charm Physics 22/05/2018

!1

Outline

Introduction

LHCb

Experimental status

Ξcc++ observation

Lifetime measurement

Prospects and conclusion

!2

Doubly Heavy Baryons

Two SU(4) baryon 20-plets (JP = 1/2+ and JP = 3/2+)

Each has a doubly charmed SU(3) triplet (Ξcc++(ccu), Ξcc+(ccd) and Ωcc+(ccs))

!3

JP =1

2

+

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JP =3

2

+

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JP = 3/2+ baryons decay via strong interactions to JP = 1/2+

JP = 1/2+ baryons decay weakly to other flavours

Ξcc++ - Mass

Theoretical predictions of Ξcc++ mass are 3.5-3.7 GeV/c2

and expected to be close to Ξcc+[1-6]!4

https://indico.cern.ch/event/632400/

Ξcc++ - Lifetime

Large ambiguity in theoretical predictions [7-12]

!5

Reference Ξcc++ (ps) Ξcc+ (ps) Ωcc+ (ps)

Karliner, Rosner, 2014 0.185 0.053

Kiselev, Likhoded, Onishchenko, 1998

0.430 +/- 0.100 0.110 +/- 0.010

Kiselev, Likhoded, 2002 0.460 +/- 0.050 0.160 +/- 0.050 0.270 +/- 0.060

Guberina, Melic, Stefancic, 1998

1.050 0.200 0.300

Chang, Li, Li, Wang, 2007 0.670 0.250 0.210

W-exchange

SELEX experiment Ξcc+ measurement

Observed Ξcc+→ Λc+K-π+ and Ξcc+→pD+K- decays

Short lifetime: 𝞃Ξcc+ < 33 fs @90% CL

Large production: exceeding theoretical predictions by orders of magnitude

Mass (combined): 3518.7 ± 1.7 MeV !6

15.9 events

5.62 events

PRL 97, 162001 (2006)

Other Ξcc+ searches

Results not confirmed by other experiments (Focus, BaBar, Belle and LHCb)

JHEP 12 (2013) 090

!7

Belle

SELEXΞcc+

PRL 97, 162001 (2006)

LHCb

Good momentum resolution: p/δp ≈ 0.5% - 1% (5-200 GeV)

Good vertex resolution: IP resolution ≈ 20 µm

Particle identification: 𝜖(𝐾 → 𝐾) ~95%, Mis-ID 𝜖 (𝜋 → 𝐾) ~5% !8

LHCb

L0 hardware trigger: looks for transverse energy signatures

Software high level trigger: near real time alignment and calibration in trigger

!9

LHCb

Run I: 1.0 fb-1 at 7 TeV (2011) + 2.0 fb-1 at 8 TeV (2012)

Run II: 0.3 fb-1 (2015) + 1.7 fb-1 (2016) + 1.7 fb-1 (2017) at 13 TeV !10

Ξcc++→Λc+K-π+π+

Most promising channel for observation [13]

See talk in parallel session tomorrow by Prof. Yu https://indico.inp.nsk.su/event/10/session/7/contribution/29

Lifetime measurementimportant to confirm weakly decaying nature

!11

Dataset, reconstruction and selection

2016 data (1.7fb-1)

Signal kinematical distributions taken from MC

Background distributions taken from wrong-sign Ξcc++→ Λc+ K- π+π- samples

First reconstruct Λc+→pK-π+, then combine with K-π+π+

!12

Dataset, reconstruction and selection

Selection is performed in three steps:

Trigger (dedicated trigger line): Kinematical constraints, PID, track and vertex quality

Preselection: Ghost probability, kinematical constraints, vertex and PV refit quality

MVA: Kinematical constraints and Vertex refit quality!13

Mass fit

Signal yield: 313 ± 33

m⌅++cc

= 3621.40± 0.72(stat)± 0.27(syst)± 0.14(⇤c)MeV

PRL 119 (2017) 112001

!14

𝑚(Ξcc++) = 𝑚(Λc+𝐾-𝜋+) − 𝑚(Λc+) +

Local significance > 12𝜎

Mass value consistent with theoretical range of predictions! Not consistent with Ξcc+ SELEX measurement [MLHCb(Ξcc++) - MSELEX(Ξcc+) = 103 ± 2 MeV ]

Mass fit - Run I data

Also significant in 2012 and consistent with 2016 data

Signal yield: 113 ± 21

PRL 119 (2017) 112001

!15Local significance > 7𝜎

]2c) [MeV/++ccΞ(candm

3500 3600 3700

2 cC

andi

date

s per

5 M

eV/

10

20

30

40

50

60

70

DataTotalSignalBackground

LHCb 8 TeV

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Signal properties

Measuring its lifetime is crucial to establish the weak nature of its decay and for comparison with theoretical predictions

!16

PRL 119 (2017) 112001

Lifetime measurementWe perform a lifetime measurement, using the Ξcc++→ Λc+K-π+π+ decay, relative to the control channel of same topology, Λb0→Λc+π−π+π−

Unbinned maximum likelihood fit of the background subtracted Ξcc++ decay time distribution (sFit)

!17

f⌅++cc

(t) = h⇤0b(t)⇥

✏⌅++cc

(t)

✏⇤0b(t)

⇥ e�

1⌧⌅++cc

� 1⌧⇤0b

!t

<latexit sha1_base64="AEEptZaEYMmBgZ9WhIB8h8JBcxU=">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</latexit><latexit sha1_base64="AEEptZaEYMmBgZ9WhIB8h8JBcxU=">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</latexit><latexit sha1_base64="AEEptZaEYMmBgZ9WhIB8h8JBcxU=">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</latexit><latexit sha1_base64="AEEptZaEYMmBgZ9WhIB8h8JBcxU=">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</latexit>



Λb0 data and acceptances incorporated to PDF as histograms

!17

f⌅++cc

(t) = h⇤0b(t)⇥

✏⌅++cc

(t)

✏⇤0b(t)

⇥ e�

1⌧⌅++cc

� 1⌧⇤0b

!t





PDG Λb0 lifetime (1.470 +/- 0.010 ps) used as input

!17

f⌅++cc

(t) = h⇤0b(t)⇥

✏⌅++cc

(t)

✏⇤0b(t)

⇥ e�

1⌧⌅++cc

� 1⌧⇤0b

!t





PDG Λb0 lifetime (1.470 +/- 0.010 ps) used as input

Measurement performed with Λb0 and result consistent with PDG value !17

f⌅++cc

(t) = h⇤0b(t)⇥

✏⌅++cc

(t)

✏⇤0b(t)

⇥ e�

1⌧⌅++cc

� 1⌧⇤0b

!t


Data samples and selectionLHCb 2016 (~1.7 fb-1 - 13TeV)

Mostly same selection criteria of observation

Specific hardware trigger:

Large hadronic ET deposit from decay products;

Or large ET deposit in calorimeters or muon stations from tracks other than the decay products

Decay time range: 0.10-2.00 ps

Mass fits used to obtain sWeights!18

N⌅++cc

= 304± 35<latexit sha1_base64="yKKda7lkm6YQDff1sKlgKWO56RA=">AAACB3icdVDLSgMxFM3UV62vqktBgkUQCiXTdmi7EIpuXEkF+4C2Dpk0bUMzD5KMUIbZufFX3LhQxK2/4M6/MdNWUNEDFw7n3Mu99zgBZ1Ih9GGklpZXVtfS65mNza3tnezuXkv6oSC0SXzui46DJeXMo03FFKedQFDsOpy2ncl54rdvqZDM967VNKB9F488NmQEKy3Z2cNLO+p1mB0REt9E+Xwcw1NYQmXYC1xYsuxsDhVqNVS0EEyIVbYqCalaZqUMzQKaIQcWaNjZ997AJ6FLPUU4lrJrokD1IywUI5zGmV4oaYDJBI9oV1MPu1T2o9kfMTzWygAOfaHLU3Cmfp+IsCvl1HV0p4vVWP72EvEvrxuqYbUfMS8IFfXIfNEw5FD5MAkFDpigRPGpJpgIpm+FZIwFJkpHl9EhfH0K/yetYsFEBfOqnKufLeJIgwNwBE6ACSqgDi5AAzQBAXfgATyBZ+PeeDRejNd5a8pYzOyDHzDePgFpRZe5</latexit><latexit sha1_base64="yKKda7lkm6YQDff1sKlgKWO56RA=">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</latexit><latexit sha1_base64="yKKda7lkm6YQDff1sKlgKWO56RA=">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</latexit><latexit sha1_base64="yKKda7lkm6YQDff1sKlgKWO56RA=">AAACB3icdVDLSgMxFM3UV62vqktBgkUQCiXTdmi7EIpuXEkF+4C2Dpk0bUMzD5KMUIbZufFX3LhQxK2/4M6/MdNWUNEDFw7n3Mu99zgBZ1Ih9GGklpZXVtfS65mNza3tnezuXkv6oSC0SXzui46DJeXMo03FFKedQFDsOpy2ncl54rdvqZDM967VNKB9F488NmQEKy3Z2cNLO+p1mB0REt9E+Xwcw1NYQmXYC1xYsuxsDhVqNVS0EEyIVbYqCalaZqUMzQKaIQcWaNjZ997AJ6FLPUU4lrJrokD1IywUI5zGmV4oaYDJBI9oV1MPu1T2o9kfMTzWygAOfaHLU3Cmfp+IsCvl1HV0p4vVWP72EvEvrxuqYbUfMS8IFfXIfNEw5FD5MAkFDpigRPGpJpgIpm+FZIwFJkpHl9EhfH0K/yetYsFEBfOqnKufLeJIgwNwBE6ACSqgDi5AAzQBAXfgATyBZ+PeeDRejNd5a8pYzOyDHzDePgFpRZe5</latexit>

N⇤0b= 3397± 119

<latexit sha1_base64="37AF9L8hhLby9q1E0IcFWNt45Zg=">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</latexit><latexit sha1_base64="37AF9L8hhLby9q1E0IcFWNt45Zg=">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</latexit><latexit sha1_base64="37AF9L8hhLby9q1E0IcFWNt45Zg=">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</latexit><latexit sha1_base64="37AF9L8hhLby9q1E0IcFWNt45Zg=">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</latexit>

]2c) [MeV/+π+π−π+cΛ(m5500 5600 5700

)2 cC

andi

date

s / (5

MeV

/

0

100

200

300

400

500

600

700

800

DataTotal fitSignalBackground

LHCbPreliminary

(b)

]2c) [MeV/+π+π−K+cΛ(m3500 3600 3700

)2 cC

andi

date

s / (5

MeV

/

020406080

100120140160

DataTotal fitSignalBackground

LHCbPreliminary

(a)

LHCB-PAPER-2018-19

LHCB-PAPER-2018-19

Decay time

Normalized, background subtracted decay time distributions!19

0.5 1 1.5 2Decay time [ps]

0.00

0.05

0.10

0.15

0.20N

orm

aliz

ed y

ield

/ (0

.095

ps)

++ccΞ0bΛ

LHCbPreliminary

LHCB-PAPER-2018-19

Decay time and acceptance

MC samples reweighted to match PT distributions in data

!20

0.5 1 1.5 2Decay time [ps]

0

0.5

1

1.5

2

2.5

3

Acc

epta

nce

(arb

itrar

y sc

ale)

++ccΞ0bΛ

LHCb simulation

✏(t) =Nrec(t)

Ngen(t)<latexit sha1_base64="2ej3clzrm9qbk1fEwEtN+p+IPiw=">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</latexit><latexit sha1_base64="2ej3clzrm9qbk1fEwEtN+p+IPiw=">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</latexit><latexit sha1_base64="2ej3clzrm9qbk1fEwEtN+p+IPiw=">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</latexit><latexit sha1_base64="2ej3clzrm9qbk1fEwEtN+p+IPiw=">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</latexit>

LHCB-PAPER-2018-19

Decay time [ps]0.5 1 1.5 2

Yie

ld /

(0.0

95 p

s)

0

10

20

30

40

50

60 LHCbPreliminary

DataFit

Results

!21

⌧⌅++cc

= 0.256+0.024�0.022 ps (stat. only)

<latexit sha1_base64="L/bO6/9ndZPZyo20q36qnBAJFU8=">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</latexit><latexit sha1_base64="L/bO6/9ndZPZyo20q36qnBAJFU8=">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</latexit><latexit sha1_base64="L/bO6/9ndZPZyo20q36qnBAJFU8=">AAACXnicdVFRa9swEJa9re3Sdc22l0JfxMKgo8zIJl7ah0HpXvrYQdMG4szIitKISrKRzoMg/Cf3VvrSn1I5zaAN64Hgu++74+4+FZUUFgi5DcJXr99sbG697Wy/23m/2/3w8dKWtWF8yEpZmlFBLZdC8yEIkHxUGU5VIflVcfOz1a/+cGNFqS9gUfGJotdazASj4Km8W2dA69xlI5E7xprf7vCwafAPTKIk/e4zEpGk3+TuWwuSBmdzW1HGHYlipnyqKMyNcriy69KBBQrROltqufja5N0eiY6PSZIS3IK0nw5acJTGgz6OI7KMHlrFed79m01LViuugUlq7TgmFUwcNSCY5E0nqy33Y27oNR97qKniduKW9jT4i2emeFYa/zTgJfu0w1Fl7UIVvrI9x65rLfk/bVzD7GjihK5q4Jo9DprVEkOJW6/xVBjOQC48oMwIvytmc2ooA/8jHW/Cv0vxy+AyiWLv3a9+7+R0ZccW2kef0QGK0QCdoDN0joaIobsgCDrBdnAfboQ74e5jaRisej6hZxHuPQCvgrH+</latexit><latexit sha1_base64="L/bO6/9ndZPZyo20q36qnBAJFU8=">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</latexit>

Statistical errors from MC and Λb0 samples obtained from pseudoexperiments

LHCB-PAPER-2018-19

�MC = 0.007 ps<latexit sha1_base64="Zm42EmIIq47weJzpo9K/jDuX5Ao=">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</latexit><latexit sha1_base64="Zm42EmIIq47weJzpo9K/jDuX5Ao=">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</latexit><latexit sha1_base64="Zm42EmIIq47weJzpo9K/jDuX5Ao=">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</latexit><latexit sha1_base64="Zm42EmIIq47weJzpo9K/jDuX5Ao=">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</latexit>

�⇤0b= 0.006 ps

<latexit sha1_base64="sI4xMgGZENeaRl88/y7N54ANm6M=">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</latexit><latexit sha1_base64="sI4xMgGZENeaRl88/y7N54ANm6M=">AAACInicdVDLSgMxFM3UV62vqks3wSK4KpnS2nYhFN24cFHBPqBTh0yatqHJzJBkhDLMt7jxV9y4UNSV4MeYaSuo6IULh3Pu4d57vJAzpRF6tzJLyyura9n13Mbm1vZOfnevrYJIEtoiAQ9k18OKcubTlmaa024oKRYepx1vcp7qnVsqFQv8az0NaV/gkc+GjGBtKDdfdxQbCezGzqUxDbDr3aAEnkJUROgEOmMVYkJjVLQhEQl0BNZjKeJQJdDNF1CxXkelCoIpqJQr1RTUKna1DG3jT6sAFtV086/OICCRoL4mHCvVs1Go+zGWmhFOk5wTKWq2TfCI9gz0saCqH89eTOCRYQZwGEjTvoYz9rsjxkKpqfDMZHqj+q2l5F9aL9LDWj9mfhhp6pP5omHEoQ5gmhccMEmJ5lMDMJHM3ArJGEtMtEk1Z0L4+hT+D9qlom0ivCoXGmeLOLLgAByCY2CDKmiAC9AELUDAHXgAT+DZurcerRfrbT6asRaeffCjrI9PFu2izw==</latexit><latexit sha1_base64="sI4xMgGZENeaRl88/y7N54ANm6M=">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</latexit><latexit sha1_base64="sI4xMgGZENeaRl88/y7N54ANm6M=">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</latexit>

Systematic uncertainties

!22

Source Uncertainty (ps) Signal and background mass models 0.005Correlation of mass and decay-time 0.004Binning 0.001Data-simulation differences 0.004Resonant structure of decays 0.011Hardware trigger threshold 0.002Simulated Ξcc++ lifetime 0.002Λ0b lifetime uncertainty 0.001Sum in quadrature 0.014

Total systematic uncertainties significantly lower than statistical uncertainties

Additional Checks

Sample splitting

Charge

Polarity

Number of primary vertices

L0 requirements

Binned approach

!23

Future prospectsΞcc++:

Other decay modes:

Ξcc++→Ξc+π+

Ξcc++→Λc+π+

Ξcc++→pD+K-π+

Production cross-section

Other states:

Ξcc+

Ωcc+ !24

Conclusions

A significant structure consistent with Ξcc++ was observed in LHCb 2016 data PRL 119, 112001 (2017)

Measured mass is consistent with theoretical range of predictions*

Lifetime is measured to be:LHCB-PAPER-2018-19

Many studies more to come:

Other Ξcc++ decay modes and properties

Other doubly-charmed baryon states!25

⌅++cc = 0.256+0.024

�0.022 (stat.) ± 0.014 (syst.) ps<latexit sha1_base64="1J/R1ZwhNAe1486R/wZx0zI4hC8=">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</latexit><latexit sha1_base64="1J/R1ZwhNAe1486R/wZx0zI4hC8=">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</latexit><latexit sha1_base64="1J/R1ZwhNAe1486R/wZx0zI4hC8=">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</latexit><latexit sha1_base64="1J/R1ZwhNAe1486R/wZx0zI4hC8=">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</latexit>

m⌅++cc

= 3621.40± 0.72(stat)± 0.27(syst)± 0.14(⇤c)MeV

*not compatible with SELEX Ξcc+ mass measurement

!26

Backup

LHCb

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb

Interaction Region

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb

- Vertex Locator (vertex reconstruction)• Impact parameter resolution: 20μm• Decay time resolution: 45 fs (𝜏}~1.5 p

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb- Tracking system (particle reconstruction)

• 𝜖 Tracking ~ 96% • 𝛿𝑝⁄𝑝 ~ 0.5%-1% (5-200 GeV) • 𝜎(mB→cc) ≈ 22MeV

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb- Magnet

• Bending power: 4 Tm • Reversable polarity

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb- RICH detectors (𝐾⁄𝜋/𝑝 separation)

• 𝜖 (𝐾 → 𝐾) ~95% • Mis-ID 𝜖 (𝜋 → 𝐾) ~5%

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb- Calorimeters

• L0 • Scintilating detectors • ID and energy

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

LHCb- Muon chambers

• Multi-Wire Proportional Chamber (MWPC) • MisID rates between 6.2% and 0.33 %

JINST 3 (2008) S08005 IJMPA 30 (2015) 1530022 !27

Additional testsMultiple candidates: not creating fake narrow structure

Checking combinations of tracks from Λc+ and Ξcc++ : not peaking

MVA efficiency as a function of mass: very smooth

Varying threshold value of MVA selector and using cut based selection: structure stays significant

Varying particle ID selections: no peaking structure emerging in WS combinations, structure stays in RS sample

Run I sample used as crosscheck: same structure seen!28

Additional tests

Structure still significant with 𝛕Ξcc > 5σ

Consistent with weak decay

!29

Systematic uncertainties

!30

References[1]D.-H. He et al., Evaluation of spectra of baryons containing two heavy quarks in bag model, Phys. Rev. D70 (2004) 094004, arXiv:hep-ph/0403301.

[2]C.-H. Chang, C.-F. Qiao, J.-X. Wang, and X.-G. Wu, Estimate of the hadronic production of the doubly charmed baryon Ξcc under GM-VFN scheme, Phys. Rev. D73 (2006) 094022, arXiv:hep-ph/0601032.

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Measurements with doubly-charmed hadronsAlso signiﬁcant in 2012 and consistent with 2016 data Signal yield: 113 ± 21 PRL 119 (2017) 112001 !15 Local signiﬁcance > 7& ++) [MeV/c2]