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

DataBETA

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

ZEUS

Collaboration

Jun, 1997

32 pages

Published in:

Z.Phys.C 76 (1997) 631-646

e-Print:

hep-ex/9708007 [hep-ex]

DOI:

10.1007/s002880050585

Report number:

DESY-97-112,
ANL-HEP-PR-98-58

Experiments:

DESY-HERA-ZEUS

View in:

reference search36 citations

Citations per year

Abstract:

Using the ZEUS detector at HERA, we have searched for heavy excited states of electrons, neutrinos, and quarks in

e^+p

collisions at a center-of-mass energy of 300~GeV. With an integrated luminosity of 9.4~pb

^{-1}

, no evidence was found for electroweak production and decay of such states. Limits on the production cross section times branching ratio and on the characteristic couplings,

f/\Lambda

, are derived for masses up to 250~GeV. For the particular choice

f/\Lambda = 1/M_{f^*}

, we exclude at the 95% confidence level excited electrons with mass between 30 and 200~GeV, excited electron neutrinos with mass between 40 and 96~GeV, and quarks excited electroweakly with mass between 40 and 169~GeV.

Note:

39 pages including 11 figures Report-no: DESY-97-112

positron p: colliding beams
new particle: search for
e*
neutrino/e: excited state
quark: excited state
excited state: decay modes
channel cross section: branching ratio
upper limit
coupling: excited state
mass: excited state

References(35)

Figures(12)

Search for excited electrons using the ZEUS detector

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 316 (1993) 207-218
•
DOI:
- 10.1016/0370-2693(93)90680-G

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

Search for excited fermions with the H1 detector

H1

Collaboration

•

S. Aid

et al.

- Nucl.Phys.B 483 (1997) 44-66
•
e-Print:
- hep-ex/9609008
•
DOI:
- 10.1016/S0550-3213(96)00591-3

Excited Lepton Production at LEP and HERA

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

Excited Quarks and Leptons

- Phys.Lett.B 147 (1984) 189-196
•
DOI:
- 10.1016/0370-2693(84)90618-X

Limits on Masses and Couplings of Excited Electrons and Muons

F.M. Renard
(
- CERN
)

- Phys.Lett.B 116 (1982) 264-268
•
DOI:
- 10.1016/0370-2693(82)90339-2

On the $g-2$ and the $p \bar{p} \to \Z^0 \to \ell^+ \ell^- \gamma$ Events

F. del Aguila
(
- Barcelona, Autonoma U.
)
,
A. Mendez
(
- Barcelona, Autonoma U.
)
,
R. Pascual
(
- Barcelona, Autonoma U.
)

- Phys.Lett.B 140 (1984) 431-434
•
DOI:
- 10.1016/0370-2693(84)90786-X

Anomalous $Z$ Decays and $g-2$ of Electron

Mahiko Suzuki
(
- UC, Berkeley and
- LBL, Berkeley
)

- Phys.Lett.B 143 (1984) 237-240
•
DOI:
- 10.1016/0370-2693(84)90842-6

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 excited leptons in e+ e annihilation at s**(1/2) = 130-GeV - 140-GeV

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 370 (1996) 211-221
•
DOI:
- 10.1016/0370-2693(96)00045-7

Study of radiative leptonic events with hard photons and search for excited charged leptons at S**(1/2) = 130-GeV - 136-GeV

DELPHI

Collaboration

•

P. Abreu

et al.

- Phys.Lett.B 380 (1996) 480-490
•
DOI:
- 10.1016/0370-2693(96)00672-7

Search for excited leptons at 130-GeV - 140-GeV

ALEPH

Collaboration

•

D. Buskulic
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 385 (1996) 445-453
•
DOI:
- 10.1016/0370-2693(96)00961-6

Search for excited leptons in e+ e- collisions at s**(1/2) = 130-GeV and 136-GeV

OPAL

Collaboration

•

G. Alexander

et al.

- Phys.Lett.B 386 (1996) 463-474
•
DOI:
- 10.1016/0370-2693(96)01078-7

Search for excited leptons in e+ e- collisions at s**(1/2) = 161-GeV

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Phys.Lett.B 391 (1997) 197-209
•
DOI:
- 10.1016/S0370-2693(96)01553-5

Search for excited leptons in e+ e- collisions at s**(1/2) = 161-GeV

DELPHI

Collaboration

•

P. Abreu

et al.

- Phys.Lett.B 393 (1997) 245-260
•
DOI:
- 10.1016/S0370-2693(96)01618-8

Search for excited quarks in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

CDF

Collaboration

•

F. Abe

et al.

- Phys.Rev.Lett. 72 (1994) 3004-3008
•
DOI:
- 10.1103/PhysRevLett.72.3004

Search for new particles decaying to dijets in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

CDF

Collaboration

•

F. Abe
(
- KEK, Tsukuba
)

et al.

- Phys.Rev.Lett. 74 (1995) 3538-3543
•
e-Print:
- hep-ex/9501001
•
DOI:
- 10.1103/PhysRevLett.74.3538

A Measurement of sigma(tot) (gamma p) at s**(1/2) = 210-GeV

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 293 (1992) 465-477
•
DOI:
- 10.1016/0370-2693(92)90914-P

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

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

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

The ZEUS vertex detector: Design and prototype test

C. Alvisi
(
- CERN and
- Bologna U. and
- Calabria U. and
- Florence U. and
- INFN, Bologna and
- INFN, Florence and
- Frascati and
- Florence, IROE
)
,
G. Anzivino
(
- CERN and
- Bologna U. and
- Calabria U. and
- Florence U. and
- INFN, Bologna and
- INFN, Florence and
- Frascati and
- Florence, IROE
)
,
F. Arzarello
(
- CERN and
- Bologna U. and
- Calabria U. and
- Florence U. and
- INFN, Bologna and
- INFN, Florence and
- Frascati and
- Florence, IROE
)
,
G. Barbagli
(
- CERN and
- Bologna U. and
- Calabria U. and
- Florence U. and
- INFN, Bologna and
- INFN, Florence and
- Frascati and
- Florence, IROE
)
,
G. Bari
(
- CERN and
- Bologna U. and
- Calabria U. and
- Florence U. and
- INFN, Bologna and
- INFN, Florence and
- Frascati and
- Florence, IROE
)

et al.

- Nucl.Instrum.Meth.A 305 (1991) 30-38
•
DOI:
- 10.1016/0168-9002(91)90516-S

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

1-25 of 35
1
2
25 / page