Measurement of the Z+b-jet cross-section in pp collisions at $ \sqrt{s} $ = 7 TeV in the forward region - INSPIRE

DataBETA

Measurement of the Z+b-jet cross-section in pp collisions at $\sqrt{s}$ = 7 TeV in the forward region

LHCb

Collaboration

Nov 5, 2014

17 pages

Published in:

JHEP 01 (2015) 064

Published: Jan 13, 2015

e-Print:

1411.1264 [hep-ex]

DOI:

10.1007/JHEP01(2015)064

Report number:

LHCB-PAPER-2014-055,
CERN-PH-EP-2014-267

Experiments:

CERN-LHC-LHCb

View in:

reference search40 citations

Citations per year

Abstract: (Springer)

The associated production of a Z boson or an off-shell photon γ

^{*}

with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7 TeV. The Z bosons are reconstructed in the Z/γ

^{*}

→ μ

^{+}

μ

^{−}

final state from muons with a transverse momentum larger than 20 GeV, while two transverse momentum thresholds are considered for jets (10 GeV and 20 GeV). Both muons and jets are reconstructed in the pseudorapidity range 2.0 < η < 4.5. The results are based on data corresponding to 1.0 fb

^{−1}

recorded in 2011 with the LHCb detector. The measurement of the Z+b-jet cross-section is normalized to the Z+jet cross-section. The measured cross-sections are 0.1

\sigma \left(\ \mathrm{Z}/{\gamma}^{*}\left({\mu}^{+}{\mu}^{-}\right) + \mathrm{b}\hbox{-} \mathrm{jet}\right)=295\pm 60\ \left(\mathrm{stat}\right)\pm 51\ \left(\mathrm{syst}\right)\pm 10\ \left(\mathrm{lumi}\right)\ \mathrm{f}\mathrm{b}

for p

_{T}

(jet) > 10 GeV, and 0.2

\sigma \left(\mathrm{Z}/{\gamma}^{*}\left({\mu}^{+}{\mu}^{-}\right)+\mathrm{b}\hbox{-} \mathrm{jet}\right)=128\pm 36\ \left(\mathrm{stat}\right)\pm 22\ \left(\mathrm{syst}\right)\pm 5\ \left(\mathrm{lumi}\right)\ \mathrm{f}\mathrm{b}

for p

_{T}

(jet) > 20 GeV.

Hadron-Hadron Scattering
p p: colliding beams
jet: bottom
p p: scattering
cross section: measured
transverse momentum: threshold
production: small-angle
Z0: associated production
jet: associated production
Z0: leptonic decay

References(28)

Figures(0)

[1]

Measurement of the cross-section for $b$ -jets produced in association with a $Z$ boson at $\sqrt{s}=$ 7 TeV with the ATLAS detector

ATLAS

Collaboration

•

Georges Aad
(
- Freiburg U.
)

et al.

- Phys.Lett.B 706 (2012) 295-313
•
e-Print:
- 1109.1403
•
DOI:
- 10.1016/j.physletb.2011.11.059

[2]

Measurement of the Z/ $\gamma$ *+b-jet Cross Section in $pp$ Collisions at $\sqrt{s} = 7 TeV$

CMS

Collaboration

•

Serguei Chatrchyan
(
- Yerevan Phys. Inst.
)

et al.

- JHEP 06 (2012) 126
•
e-Print:
- 1204.1643
•
DOI:
- 10.1007/JHEP06(2012)126

[3]

Measurement of Cross Sections for $b$ Jet Production in Events with a $Z$ Boson in $p^-$ anti-p Collisions at $\sqrt{s}$ = 1.96-TeV

CDF

Collaboration

•

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

et al.

- Phys.Rev.D 79 (2009) 052008
•
e-Print:
- 0812.4458
•
DOI:
- 10.1103/PhysRevD.79.052008

[4]

Measurement of the Ratio of Differential Cross Sections ${\sigma}(p\bar{p} \to Z + b jet)/{\sigma}(p\bar{p} \to Z + jet)$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV

D0

Collaboration

•

Victor Mukhamedovich Abazov
(
- Dubna, JINR
)

et al.

- Phys.Rev.D 87 (2013) 9, 092010
•
e-Print:
- 1301.2233
•
DOI:
- 10.1103/PhysRevD.87.092010

[5]

First measurement of the charge asymmetry in beauty-quark pair production

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 113 (2014) 8, 082003
•
e-Print:
- 1406.4789
•
DOI:
- 10.1103/PhysRevLett.113.082003

[6]

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

[7]

Performance of the LHCb Vertex Locator

et al.

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

[8]

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

[9]

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

[10]

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

[11]

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

[12]

PYTHIA 6.4 Physics and Manual

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- Fermilab
)

- JHEP 05 (2006) 026
•
e-Print:
- hep-ph/0603175
•
DOI:
- 10.1088/1126-6708/2006/05/026

[13]

Handling of the generation of primary events in Gauss, the LHCb simulation framework

LHCb

Collaboration

•

I. Belyaev
(
- NIKHEF, Amsterdam and
- Moscow, ITEP
)

et al.

•
DOI:
- 10.1109/NSSMIC.2010.5873949

[14]

Implications of CTEQ global analysis for collider observables

Pavel M. Nadolsky
(
- Michigan State U.
)
,
Hung-Liang Lai
(
- Taiwan, Natl. Tsing Hua U. and
- Washington U., Seattle
)
,
Qing-Hong Cao
(
- Michigan State U. and
- Washington U., Seattle and
- UC, Riverside
)
,
Joey Huston
(
- Michigan State U. and
- Washington U., Seattle and
- UC, Riverside
)
,
Jon Pumplin
(
- Michigan State U. and
- Washington U., Seattle and
- UC, Riverside
)

et al.

- Phys.Rev.D 78 (2008) 013004
•
e-Print:
- 0802.0007
•
DOI:
- 10.1103/PhysRevD.78.013004

[15]

The EvtGen particle decay simulation package

D.J. Lange
(
- LLNL, Livermore
)

- Nucl.Instrum.Meth.A 462 (2001) 152-155
•
DOI:
- 10.1016/S0168-9002(01)00089-4

[16]

GEANT4 - A Simulation Toolkit

GEANT4

Collaboration

•

S. Agostinelli
(
- Genoa U.
)

et al.

- Nucl.Instrum.Meth.A 506 (2003) 250-303
•
DOI:
- 10.1016/S0168-9002(03)01368-8

[17]

The LHCb simulation application, Gauss: Design, evolution and experience

LHCb

Collaboration

•

M. Clemencic
(
- CERN
)

et al.

- J.Phys.Conf.Ser. 331 (2011) 032023
•
DOI:
- 10.1088/1742-6596/331/3/032023

[18]

Study of forward Z + jet production in pp collisions at $\sqrt{s} = 7$ TeV

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- JHEP 01 (2014) 033
•
e-Print:
- 1310.8197
•
DOI:
- 10.1007/JHEP01(2014)033

[19]

The anti- $k_t$ jet clustering algorithm

- JHEP 04 (2008) 063
•
e-Print:
- 0802.1189
•
DOI:
- 10.1088/1126-6708/2008/04/063

[20]

FastJet User Manual

Matteo Cacciari
(
- Paris, LPTHE and
- Diderot U., Paris
)
,
Gavin P. Salam
(
- CERN and
- Princeton U. and
- Paris, LPTHE
)
,
Gregory Soyez
(
- Saclay, SPhT
)

- Eur.Phys.J.C 72 (2012) 1896
•
e-Print:
- 1111.6097
•
DOI:
- 10.1140/epjc/s10052-012-1896-2

[21]

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

[22]

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

[23]

SVD approach to data unfolding

Andreas Hocker
(
- Orsay, LAL
)
,
Vakhtang Kartvelishvili
(
- Manchester U.
)

- Nucl.Instrum.Meth.A 372 (1996) 469-481
•
e-Print:
- hep-ph/9509307
•
DOI:
- 10.1016/0168-9002(95)01478-0

[24]

A Multidimensional unfolding method based on Bayes' theorem

G. D'Agostini
(
- Rome U. and
- INFN, Rome
)

- Nucl.Instrum.Meth.A 362 (1995) 487-498
•
DOI:
- 10.1016/0168-9002(95)00274-X

[25]

Herwig++ Physics and Manual

et al.

- Eur.Phys.J.C 58 (2008) 639-707
•
e-Print:
- 0803.0883
•
DOI:
- 10.1140/epjc/s10052-008-0798-9

1-25 of 28
1
2
25 / page