Angular moments of the decay $\Lambda_b^0 \rightarrow \Lambda \mu^{+} \mu^{-}$ at low hadronic recoil - INSPIRE

DataBETA

Angular moments of the decay $\Lambda_b^0 \rightarrow \Lambda \mu^{+} \mu^{-}$ at low hadronic recoil

LHCb

Collaboration

Aug 1, 2018

27 pages

Published in:

JHEP 09 (2018) 146

Published: Sep 26, 2018

e-Print:

1808.00264 [hep-ex]

DOI:

10.1007/JHEP09(2018)146

PDG: A

{}^{{{\mathit \ell}}}_{FB}({{\mathit \mu}}{{\mathit \mu}}

{{\mathit \Lambda}_{{{b}}}}

\rightarrow

{{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}

Report number:

CERN-EP-2018-197,
LHCb-PAPER-2018-029

Experiments:

CERN-LHC-LHCb

View in:

reference search119 citations

Citations per year

Abstract: (Springer)

An analysis of the angular distribution of the decay Λ

_{b}^{0}

→ Λμ

^{+}

μ

^{−}

is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately 5 fb

^{−1}

. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range 15 < q

^{2}

< 20 GeV

^{2}

/c

^{4}

. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to be \begin{array}{l}{A}_{\mathrm{FB}}^{\ell }=-0.39\pm 0.04\left(\mathrm{stat}\right)\pm 0.01\left(\mathrm{syst}\right),\hfill \\ {}{A}_{\mathrm{FB}}^h=-0.30\pm 0.05\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right),\hfill \\ {}{A}_{\mathrm{FB}}^{\ell h}=+0.25\pm 0.04\left(\mathrm{stat}\right)\pm 0.01\left(\mathrm{syst}\right).\hfill \end{array}

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-029.html

B physics
FCNC Interaction
Flavor physics
Hadron-Hadron scattering (experiments)
Rare decay
p p: scattering
p p: colliding beams
Lambda/b0: semileptonic decay
muon: pair production
decay: angular distribution

References(38)

Figures(13)

[1]

$\Lambda_b \to \Lambda \ell^+ \ell^-$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks

William Detmold
(
- MIT, Cambridge, CTP
)
,
Stefan Meinel
(
- Arizona U. and
- RIKEN BNL
)

- Phys.Rev.D 93 (2016) 7, 074501
•
e-Print:
- 1602.01399
•
DOI:
- 10.1103/PhysRevD.93.074501

[2]

Angular Analysis of the Decay $\Lambda_b \to \Lambda (\to N \pi) \ell^+\ell^-$

- JHEP 01 (2015) 155
•
e-Print:
- 1410.2115
•
DOI:
- 10.1007/JHEP01(2015)155

[3]

Status of the $B\rightarrow K^*\mu ^+\mu ^-$ anomaly after Moriond 2017

- Eur.Phys.J.C 77 (2017) 6, 377
•
e-Print:
- 1703.09189
•
DOI:
- 10.1140/epjc/s10052-017-4952-0

[4]

On Flavourful Easter eggs for New Physics hunger and Lepton Flavour Universality violation

Marco Ciuchini
(
- INFN, Rome3
)
,
Antonio M. Coutinho
(
- INFN, Rome3
)
,
Marco Fedele
(
- INFN, Rome and
- Rome U.
)
,
Enrico Franco
(
- INFN, Rome
)
,
Ayan Paul
(
- INFN, Rome
)

et al.

- Eur.Phys.J.C 77 (2017) 10, 688
•
e-Print:
- 1704.05447
•
DOI:
- 10.1140/epjc/s10052-017-5270-2

[5]

Large hadronic power corrections or new physics in the rare decay $B→K^{∗}\mu^{+}\mu^{−}$ ?

V.G. Chobanova
(
- Santiago de Compostela U., IGFAE
)
,
T. Hurth
(
- U. Mainz, PRISMA
)
,
F. Mahmoudi
(
- Lyon Observ. and
- CERN and
- IUF, Paris
)
,
D. Martinez Santos
(
- Santiago de Compostela U., IGFAE
)
,
S. Neshatpour
(
- IPM, Tehran
)

- JHEP 07 (2017) 025
•
e-Print:
- 1702.02234
•
DOI:
- 10.1007/JHEP07(2017)025

[6]

Towards the discovery of new physics with lepton-universality ratios of $b\to s\ell\ell$ decays

Li-Sheng Geng
(
- BeiHang U.
)
,
Benjamín Grinstein
(
- UC, San Diego
)
,
Sebastian Jäger
(
- Sussex U.
)
,
Jorge Martin Camalich
(
- CERN
)
,
Xiu-Lei Ren
(
- Ruhr U., Bochum and
- Peking U. and
- Peking U., SKLNPT
)

et al.

- Phys.Rev.D 96 (2017) 9, 093006
•
e-Print:
- 1704.05446
•
DOI:
- 10.1103/PhysRevD.96.093006

[7]

Patterns of New Physics in $b\to s\ell^+\ell^-$ transitions in the light of recent data

Bernat Capdevila
(
- Barcelona, IFAE
)
,
Andreas Crivellin
(
- PSI, Villigen
)
,
Sébastien Descotes-Genon
(
- Orsay, LPT
)
,
Joaquim Matias
(
- Barcelona, Autonoma U. and
- Barcelona, IFAE
)
,
Javier Virto
(
- U. Bern, AEC
)

- JHEP 01 (2018) 093
•
e-Print:
- 1704.05340
•
DOI:
- 10.1007/JHEP01(2018)093

[8]

Observation of the Baryonic Flavor-Changing Neutral Current Decay $\Lambda_{b} \to \Lambda \mu^{+} \mu^{-}$

CDF

Collaboration

•

T. Aaltonen
(
- Helsinki Inst. of Phys.
)

et al.

- Phys.Rev.Lett. 107 (2011) 201802
•
e-Print:
- 1107.3753
•
DOI:
- 10.1103/PhysRevLett.107.201802

[9]

Measurement of the differential branching fraction of the decay $\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$

LHCb

Collaboration

•

R Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Lett.B 725 (2013) 25-35
•
e-Print:
- 1306.2577
•
DOI:
- 10.1016/j.physletb.2013.06.060

[10]

Differential branching fraction and angular analysis of $\Lambda^{0}_{b} \rightarrow \Lambda \mu^+\mu^-$ decays

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- JHEP 06 (2015) 115,
- JHEP 09 (2018) 145 (erratum)
•
e-Print:
- 1503.07138
•
DOI:
- 10.1007/JHEP06(2015)115

[11]

Angular distribution of polarised $\Lambda_b$ baryons decaying to $\Lambda \ell^+\ell^-$

Thomas Blake
(
- Warwick U.
)
,
Michal Kreps
(
- Warwick U.
)

- JHEP 11 (2017) 138
•
e-Print:
- 1710.00746
•
DOI:
- 10.1007/JHEP11(2017)138

[12]

The LHCb Detector at the LHC

LHCb

Collaboration

•

A.Augusto Alves, Jr.
(
- Rio de Janeiro, CBPF
)

et al.

- JINST 3 (2008) S08005
•
DOI:
- 10.1088/1748-0221/3/08/S08005

[13]

Rare baryon decays $\Lambda_b \to \Lambda {l^{+}l^{-}} (l=e, \mu, \tau)$ and $\Lambda_b \to \Lambda\gamma$ : differential and total rates, lepton- and hadron-side forward-backward asymmetries

Thomas Gutsche
(
- Tubingen U.
)
,
Mikhail A. Ivanov
(
- Dubna, JINR
)
,
Jurgen G. Korner
(
- Mainz U., Inst. Phys.
)
,
Valery E. Lyubovitskij
(
- Tubingen U.
)
,
Pietro Santorelli
(
- Naples U. and
- INFN, Naples
)

- Phys.Rev.D 87 (2013) 074031
•
e-Print:
- 1301.3737
•
DOI:
- 10.1103/PhysRevD.87.074031

[14]

Statistical methods in experimental physics

F. James

[15]

Extracting Angular Observables without a Likelihood and Applications to Rare Decays

Frederik Beaujean
(
- Munich, Tech. U., Universe
)
,
Marcin Chrząszcz
(
- Zurich U.
)
,
Nicola Serra
(
- Zurich U.
)
,
Danny van Dyk
(
- Siegen U.
)

- Phys.Rev.D 91 (2015) 11, 114012
•
e-Print:
- 1503.04100
•
DOI:
- 10.1103/PhysRevD.91.114012

[16]

SPlot: A Statistical tool to unfold data distributions

Muriel Pivk
(
- CERN
)
,
Francois R. Le Diberder
(
- Orsay, LAL
)

- Nucl.Instrum.Meth.A 555 (2005) 356-369
•
e-Print:
- physics/0402083
•
DOI:
- 10.1016/j.nima.2005.08.106

[17]

sFit: a method for background subtraction in maximum likelihood fit

Yuehong Xie
(
- Edinburgh U.
)

e-Print:
- 0905.0724

[18]

LHCb Detector Performance

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Int.J.Mod.Phys.A 30 (2015) 07, 1530022
•
e-Print:
- 1412.6352
•
DOI:
- 10.1142/S0217751X15300227

[19]

Performance of the LHCb Vertex Locator

et al.

- JINST 9 (2014) P09007
•
e-Print:
- 1405.7808
•
DOI:
- 10.1088/1748-0221/9/09/P09007

[20]

Performance of the LHCb Outer Tracker

et al.

- JINST 9 (2014) 01, P01002
•
e-Print:
- 1311.3893
•
DOI:
- 10.1088/1748-0221/9/01/P01002

[21]

Performance of the LHCb RICH detector at the LHC

M. Adinolfi
(
- Bristol U.
)
,
G. Aglieri Rinella
(
- CERN
)
,
E. Albrecht
(
- CERN
)
,
T. Bellunato
(
- INFN, Milan Bicocca
)
,
S. Benson
(
- Edinburgh U.
)

et al.

- Eur.Phys.J.C 73 (2013) 2431
•
e-Print:
- 1211.6759
•
DOI:
- 10.1140/epjc/s10052-013-2431-9

[22]

Performance of the LHCb muon system

A.A. Alves, Jr.
(
- INFN, Rome
)
,
L. Anderlini
(
- INFN, Florence
)
,
M. Anelli
(
- Frascati
)
,
R.Antunes Nobrega
(
- INFN, Rome
)
,
G. Auriemma
(
- INFN, Rome and
- Basilicata U., Potenza
)

et al.

- JINST 8 (2013) P02022
•
e-Print:
- 1211.1346
•
DOI:
- 10.1088/1748-0221/8/02/P02022

[23]

The LHCb Trigger and its Performance in 2011

R Aaij
(
- Nikhef, Amsterdam
)
,
J Albrecht
(
- CERN
)
,
F Alessio
(
- CERN
)
,
S Amato
(
- Rio de Janeiro Federal U.
)
,
E Aslanides
(
- Marseille, CPPM
)

et al.

- JINST 8 (2013) P04022
•
e-Print:
- 1211.3055
•
DOI:
- 10.1088/1748-0221/8/04/P04022

[24]

Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree

V.V. Gligorov
(
- CERN
)
,
Mike Williams
(
- Imperial Coll., London
)

- JINST 8 (2013) P02013
•
e-Print:
- 1210.6861
•
DOI:
- 10.1088/1748-0221/8/02/P02013

[25]

A Brief Introduction to PYTHIA 8.1

Torbjorn Sjostrand
(
- CERN and
- Lund U.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- CERN and
- Fermilab
)

- Comput.Phys.Commun. 178 (2008) 852-867
•
e-Print:
- 0710.3820
•
DOI:
- 10.1016/j.cpc.2008.01.036

1-25 of 38
1
2
25 / page