Searches for excited fermions in $e p$ collisions at HERA

Searches in ep collisions for heavy excited fermions have been performed with the ZEUS detector at HERA. Excited states of electrons and quarks have been searched for in e + p collisions at a centre-of-mass energy of 300 GeV using an integrated luminosity of 47.7 pb −1 . Excited electrons have been sought via the decays e ∗ →eγ , e ∗ →eZ and e ∗ →νW . Excited quarks have been sought via the decays q ∗ →qγ and q ∗ →qW . A search for excited neutrinos decaying via ν ∗ →νγ , ν ∗ →νZ and ν ∗ →eW is presented using e − p collisions at 318 GeV centre-of-mass energy, corresponding to an integrated luminosity of 16.7 pb −1 . No evidence for any excited fermion is found, and limits on the characteristic couplings are derived for masses ≲250 GeV.

Note:

18 pages, 5 figures, Submitted to PLB. Revised analysis takes excited fermion natural width into account Report-no: DESY-01-132

positron p: colliding beams
electron p: colliding beams
positron p: inclusive reaction
new particle: search for
quark: excited state
e*
neutrino: excited state
excited state: mass
excited state: decay
coupling: upper limit

References(27)

Figures(0)

A Search for excited fermions in $e^{+} p$ collisions at HERA

ZEUS

Collaboration

•

J. Breitweg
(
- Argonne
)

et al.

- Z.Phys.C 76 (1997) 631-646
•
e-Print:
- hep-ex/9708007
•
DOI:
- 10.1007/s002880050585

A Search for excited fermions at HERA

H1

Collaboration

•

C. Adloff

et al.

- Eur.Phys.J.C 17 (2000) 567-581
•
e-Print:
- hep-ex/0007035
•
DOI:
- 10.1007/s100520000503

A Search for excited fermions in electron - proton collisions at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Z.Phys.C 65 (1995) 627-648
•
DOI:
- 10.1007/BF01578671

Excited Lepton Production at LEP and HERA

- Z.Phys.C 29 (1985) 115
•
DOI:
- 10.1007/BF01571391

Excited Quark and Lepton Production at Hadron Colliders

U. Baur
(
- Wisconsin U., Madison
)
,
M. Spira
(
- Aachen, Tech. Hochsch.
)
,
P.M. Zerwas
(
- Aachen, Tech. Hochsch.
)

- Phys.Rev.D 42 (1990) 815-824
•
DOI:
- 10.1103/PhysRevD.42.815

Excited fermions at e+ e- and e P colliders

- Z.Phys.C 57 (1993) 425-450,
- Z. Phys. C57 (1993) 425-449 and Hamburg DESY - DESY 92-116 (92/08,rec.Aug.) 58 p
•
DOI:
- 10.1007/BF01474339

Search for new particles decaying to dijets at CDF

CDF

Collaboration

•

F. Abe

et al.

- Phys.Rev.D 55 (1997) R5263-R5268
•
e-Print:
- hep-ex/9702004
•
DOI:
- 10.1103/PhysRevD.55.R5263

Vertex Triggering Using Time Difference Measurements in the ZEUS Central Tracking Detector

N. Harnew
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G.P. Heath
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
M.D. Jeffs
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
J. Nash
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G. Salmon
(
- Bristol U. and
- Oxford U. and
- Rutherford
)

et al.

- Nucl.Instrum.Meth.A 279 (1989) 290-296
•
DOI:
- 10.1016/0168-9002(89)91096-6

The Performance of the Zeus central tracking detector z-by-timing electronics in a transputer based data acquisition system

et al.

- Nucl.Phys.B Proc.Suppl. 32 (1993) 181-188,
- In *Como 1992, Proceedings, Advanced technology and particle physics* 181-188,
- Nucl. Phys. B, Proc. Suppl. 32 (1993) 181-188) and Oxford Univ. - OUNP-92-14 (92,rec.Oct.) 8 p
•
DOI:
- 10.1016/0920-5632(93)90023-Y

The Design and construction of the ZEUS central tracking detector

ZEUS

Collaboration

•

B. Foster
(
- Bristol U.
)

et al.

- Nucl.Instrum.Meth.A 338 (1994) 254-283
•
DOI:
- 10.1016/0168-9002(94)91313-7

Design and construction of the ZEUS barrel calorimeter.

et al.

- Nucl.Instrum.Meth.A 309 (1991) 77-100
•
DOI:
- 10.1016/0168-9002(91)90094-7

Construction and beam test of the ZEUS forward and rear calorimeter

ZEUS

Collaboration

•

A. Andresen
(
- Hamburg U., Inst. Theor. Phys. II
)

et al.

- Nucl.Instrum.Meth.A 309 (1991) 101-142
•
DOI:
- 10.1016/0168-9002(91)90095-8

Design and implementation of a high precision readout system for the ZEUS calorimeter

A. Caldwell
(
- Nevis Labs, Columbia U.
)
,
I. Gialas
(
- Nevis Labs, Columbia U.
)
,
S. Mishra
(
- Nevis Labs, Columbia U.
)
,
J. Parsons
(
- Nevis Labs, Columbia U.
)
,
S. Ritz
(
- Nevis Labs, Columbia U.
)

et al.

- Nucl.Instrum.Meth.A 321 (1992) 356-364
•
DOI:
- 10.1016/0168-9002(92)90413-X

Beam tests of the ZEUS barrel calorimeter

et al.

- Nucl.Instrum.Meth.A 336 (1993) 23-52
•
DOI:
- 10.1016/0168-9002(93)91078-2

Measurement of total and partial photon proton cross-sections at 180-GeV center-of-mass energy

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Z.Phys.C 63 (1994) 391-408
•
DOI:
- 10.1007/BF01580320

Photon-Photon Reactions

Christoph Berger
(
- Aachen, Tech. Hochsch.
)
,
W. Wagner
(
- UC, Davis
)

- Phys.Rept. 146 (1987) 1-134
•
DOI:
- 10.1016/0370-1573(87)90012-3

LEPTO 6.5: A Monte Carlo generator for deep inelastic lepton - nucleon scattering

G. Ingelman
(
- DESY and
- Uppsala U.
)
,
A. Edin
(
- Uppsala U.
)
,
J. Rathsman
(
- Uppsala U.
)

- Comput.Phys.Commun. 101 (1997) 108-134
•
e-Print:
- hep-ph/9605286
•
DOI:
- 10.1016/S0010-4655(96)00157-9

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics: Jetset Version 6.2

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)

- Comput.Phys.Commun. 39 (1986) 347-407
•
DOI:
- 10.1016/0010-4655(86)90096-2

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics. Jetset Version 6.3: An Update

- Comput.Phys.Commun. 43 (1987) 367
•
DOI:
- 10.1016/0010-4655(87)90054-3

High-energy physics event generation with PYTHIA 5.7 and JETSET 7.4

Torbjorn Sjostrand
(
- CERN
)

- Comput.Phys.Commun. 82 (1994) 74-90,
- CERN Geneva - TH. 7111 (93/12,rec.Jan.94) 17 p. and e: CERN th-7111-93
•
DOI:
- 10.1016/0010-4655(94)90132-5

Combined QED and QCD radiative effects in deep inelastic lepton - proton scattering: The Monte Carlo generator DJANGO6

- Comput.Phys.Commun. 81 (1994) 381-402
•
DOI:
- 10.1016/0010-4655(94)90086-8

ARIADNE version 4: A Program for simulation of QCD cascades implementing the color dipole model

Leif Lonnblad
(
- DESY
)

- Comput.Phys.Commun. 71 (1992) 15-31,
- Comput. Phys. Commun. 71 (1992) 15-31 and Hamburg DESY - DESY 92-046 (92/02,rec.Apr.) 15 p
•
DOI:
- 10.1016/0010-4655(92)90068-A

HERWIG: A Monte Carlo event generator for simulating hadron emission reactions with interfering gluons. Version 5.1 - April 1991

G. Marchesini
(
- Parma U. and
- INFN, Parma
)
,
B.R. Webber
(
- Cambridge U.
)
,
G. Abbiendi
(
- Padua U. and
- INFN, Padua
)
,
I.G. Knowles
(
- Glasgow U.
)
,
M.H. Seymour
(
- Cambridge U.
)

et al.

- Comput.Phys.Commun. 67 (1992) 465-508,
- Comput. Phys. Commun. 67 (1992) 465-508 and Hamburg DESY - DESY 91-048 (91/05,rec.Jul.) 49 p
•
DOI:
- 10.1016/0010-4655(92)90055-4

The Lund Monte Carlo for Hadronic Processes: Pythia Version 4.8

- Comput.Phys.Commun. 46 (1987) 43
•
DOI:
- 10.1016/0010-4655(87)90036-1

Electroweak vector boson production in high-energy $e p$ collisions

U. Baur
(
- Wisconsin U., Madison and
- Florida State U.
)
,
J.A.M. Vermaseren
(
- NIKHEF, Amsterdam
)
,
D. Zeppenfeld
(
- Wisconsin U., Madison
)

- Nucl.Phys.B 375 (1992) 3-44
•
DOI:
- 10.1016/0550-3213(92)90332-6

1-25 of 27
1
2
25 / page

Searches for excited fermions in epe pep collisions at HERA

Citations per year

Searches for excited fermions in $e p$ collisions at HERA