Search for Stopped Long-Lived Particles Produced in $pp$ Collisions at $\sqrt{s}=7$ TeV

A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6 +/- 2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the "cloud model" of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds.

Note:

Replaced with published version. Added journal reference and DOI

p p: scattering
stop: pair production
postulated particle: long-lived
CMS
CERN LHC Coll
gluino: pair production
R-hadron: production
trigger
new particle: search for
R-hadron: decay

References(39)

Figures(6)

[1]

Experimental signatures of low-energy gauge mediated supersymmetry breaking

Savas Dimopoulos
(
- Stanford U., Phys. Dept. and
- CERN
)
,
Michael Dine
(
- UC, Santa Cruz
)
,
Stuart Raby
(
- Ohio State U.
)
,
Scott D. Thomas
(
- SLAC
)

- Phys.Rev.Lett. 76 (1996) 3494-3497
•
e-Print:
- hep-ph/9601367
•
DOI:
- 10.1103/PhysRevLett.76.3494

[2]

A Heavy gluino as the lightest supersymmetric particle

Howard Baer
(
- UC, Davis and
- Florida State U.
)
,
King-man Cheung
(
- UC, Davis
)
,
John F. Gunion
(
- UC, Davis
)

- Phys.Rev.D 59 (1999) 075002
•
e-Print:
- hep-ph/9806361
•
DOI:
- 10.1103/PhysRevD.59.075002

[3]

Long life stau in the minimal supersymmetric standard model

- Phys.Rev.D 73 (2006) 055009,
- Phys.Rev.D 87 (2013) 1, 019901 (erratum)
•
e-Print:
- hep-ph/0512197
•
DOI:
- 10.1103/PhysRevD.73.055009

[4]

Echoes of a hidden valley at hadron colliders

- Phys.Lett.B 651 (2007) 374-379
•
e-Print:
- hep-ph/0604261
•
DOI:
- 10.1016/j.physletb.2007.06.055

[5]

Astrophysical Probes of Unification

Asimina Arvanitaki
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Savas Dimopoulos
(
- Stanford U., Phys. Dept.
)
,
Sergei Dubovsky
(
- Stanford U., Phys. Dept. and
- Moscow, INR
)
,
Peter W. Graham
(
- Stanford U., Phys. Dept.
)
,
Roni Harnik
(
- Stanford U., Phys. Dept.
)

et al.

- Phys.Rev.D 79 (2009) 105022
•
e-Print:
- 0812.2075
•
DOI:
- 10.1103/PhysRevD.79.105022

[6]

Supersymmetric unification without low energy supersymmetry and signatures for fine-tuning at the LHC

- JHEP 06 (2005) 073
•
e-Print:
- hep-th/0405159
•
DOI:
- 10.1088/1126-6708/2005/06/073

[7]

Search for Supersymmetric Particles in Hadron - Hadron Collisions

Sally Dawson
(
- Fermilab and
- LBL, Berkeley
)
,
E. Eichten
(
- Fermilab
)
,
C. Quigg
(
- Fermilab
)

- Phys.Rev.D 31 (1985) 1581
•
DOI:
- 10.1103/PhysRevD.31.1581

[8]

Squark and gluino production at hadron colliders

- Nucl.Phys.B 492 (1997) 51-103
•
e-Print:
- hep-ph/9610490
•
DOI:
- 10.1016/S0550-3213(97)80027-2

[9]

Squark and gluino production with jets

T. Plehn
(
- Munich, Max Planck Inst.
)
,
D. Rainwater
(
- Rochester U.
)
,
Peter Z. Skands
(
- Fermilab
)

- Phys.Lett.B 645 (2007) 217-221
•
e-Print:
- hep-ph/0510144
•
DOI:
- 10.1016/j.physletb.2006.12.009

[10]

Soft-gluon resummation for squark and gluino hadroproduction

Wim Beenakker
(
- Nijmegen U.
)
,
Silja Brensing
(
- Aachen, Tech. Hochsch.
)
,
Michael Kramer
(
- Aachen, Tech. Hochsch.
)
,
Anna Kulesza
(
- Aachen, Tech. Hochsch.
)
,
Eric Laenen
(
- Amsterdam U. and
- Utrecht U. and
- NIKHEF, Amsterdam
)

et al.

- JHEP 12 (2009) 041
•
e-Print:
- 0909.4418
•
DOI:
- 10.1088/1126-6708/2009/12/041

[11]

Limits on split supersymmetry from gluino cosmology

Asimina Arvanitaki
(
- Stanford U., ITP
)
,
Chad Davis
(
- Stanford U., ITP
)
,
Peter W. Graham
(
- Stanford U., ITP
)
,
Aaron Pierce
(
- SLAC and
- Stanford U., ITP
)
,
Jay G. Wacker
(
- Stanford U., ITP
)

- Phys.Rev.D 72 (2005) 075011
•
e-Print:
- hep-ph/0504210
•
DOI:
- 10.1103/PhysRevD.72.075011

[12]

Search for Stopped Gluinos from $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV

D0

Collaboration

•

V.M. Abazov
(
- Dubna, JINR
)

et al.

- Phys.Rev.Lett. 99 (2007) 131801
•
e-Print:
- 0705.0306
•
DOI:
- 10.1103/PhysRevLett.99.131801

[13]

Search for Stopped Gluinos in $pp$ collisions at $\sqrt{s}=7$ TeV

CMS

Collaboration

•

Vardan Khachatryan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.Lett. 106 (2011) 011801
•
e-Print:
- 1011.5861
•
DOI:
- 10.1103/PhysRevLett.106.011801

[14]

Search for decays of stopped, long-lived particles from 7 TeV pp collisions with the ATLAS detector

ATLAS

Collaboration

•

Georges Aad
(
- Freiburg U.
)

et al.

- Eur.Phys.J.C 72 (2012) 1965
•
e-Print:
- 1201.5595
•
DOI:
- 10.1140/epjc/s10052-012-1965-6

[15]

Limit on the mass of a long-lived or stable gluino

- JHEP 02 (2011) 018
•
e-Print:
- 1011.2964
•
DOI:
- 10.1007/JHEP02(2011)018

[16]

Spontaneously Broken Supersymmetric Theories of Weak, Electromagnetic and Strong Interactions

Pierre Fayet
(
- Ecole Polytechnique
)

- Phys.Lett.B 69 (1977) 489,
- IN *FERRARA, S. (ED.): SUPERSYMMETRY, VOL. 1*, 666-671. (PHYS. LETT. B69 (1977) 489-494)
•
DOI:
- 10.1016/0370-2693(77)90852-8