# ${{\boldsymbol A}^{0}}$ (Axion) Production in Hadron Collisions INSPIRE search

Limits are for ${\mathit \sigma (}{{\mathit A}^{0}}{)}$ $/$ ${\mathit \sigma (}{{\mathit \pi}^{0}}{)}$.
VALUE CL% EVTS DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
1
 2007
CNTR ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
2
 1997
SPEC ${{\mathit e}^{+}}$ production
3
 1997
SPEC ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
4
 1996
SPEC ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
5
 1996
EMUL ${}^{32}\mathrm {S}$ emulsion, ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
6
 1992
BDMP ${{\mathit A}^{0}}$ ${{\mathit N}_{{Z}}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit N}_{{Z}}}$
7
 1992
SPEC ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit A}^{0}}$ , ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
8
 1991
BDMP ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , 2${{\mathit \gamma}}$
9
 1989
OSPK Beam dump, ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
10
 1988
RVUE ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
11
 1988
EMUL ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
12
 1988
OSPK Beam dump, ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$
13
 1986
BDMP ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$<2. \times 10^{-11}$ 90 0 14
 1985
CHRM CERN beam dump
$<1. \times 10^{-13}$ 90 0 14
 1985
CHRM CERN beam dump
24 15
 1983
OSPK Beam dump, ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$
16
 1983 B
RVUE LAMPF beam dump
17
 1983 B
RVUE LAMPF beam dump
18
 1983
CNTR ${{\mathit \pi}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit A}^{0}}$ ( ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ )
19
 1982
RVUE
12 20
 1981
OSPK CERN PS ${{\mathit \nu}}$ wideband
15 21
 1981 B
OSPK Beam dump, ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$
8 22
 1981
OSPK 26 GeV ${{\mathit p}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit A}^{0}}$ X
0 23
 1980
OSPK Beam dump, ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$<1. \times 10^{-8}$ 90 24
 1980
HLBC 28 GeV protons
$<1. \times 10^{-14}$ 90 24
 1980
HLBC Beam dump
25
 1980
CALO 28 GeV ${{\mathit p}}$ beam dump
26
 1979
CNTR
$<1. \times 10^{-8}$ 90 27
 1979
OSPK Beam dump
$<1. \times 10^{-3}$ 95 28
 1979
CALO 400 GeV ${{\mathit p}}{{\mathit p}}$
$<1. \times 10^{-8}$ 90
 1978
HYBR Beam dump
$<6. \times 10^{-9}$ 95
 1978 B
CALO Beam dump
$<1.5 \times 10^{-8}$ 90 29
 1978
HLBC Beam dump
$<5.4 \times 10^{-14}$ 90 29
 1978
HLBC ${\mathit m}_{{{\mathit A}^{0}}}=1.5$ MeV
$<4.1 \times 10^{-9}$ 90 29
 1978
HLBC ${\mathit m}_{{{\mathit A}^{0}}}$=1 MeV
$<1. \times 10^{-8}$ 90 30
 1978 B
HYBR Beam dump
31
 1978
$<0.5 \times 10^{-8}$ 90
 1978 D
WIRE Beam dump
32
 1978
33
 1978
1  JAIN 2007 claims evidence for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ produced in ${}^{207}\mathrm {Pb}$ collision on nuclear emulsion (${}^{}\mathrm {Ag}/{}^{}\mathrm {Br}$) for $\mathit m({{\mathit A}^{0}}$) = $7$ $\pm1$ or $19$ $\pm1$ MeV and $\tau ({{\mathit A}^{0}}$) ${}\leq{}$ $10^{-13}$ s.
2  AHMAD 1997 reports a result of APEX Collaboration which studied positron production in ${}^{238}\mathrm {U}+{}^{232}\mathrm {Ta}$ and ${}^{238}\mathrm {U}+{}^{181}\mathrm {Ta}$ collisions, without requiring a coincident electron. No narrow lines were found for $250<\mathit E_{{{\mathit e}^{+}}}<750$ keV.
3  LEINBERGER 1997 (ORANGE Collaboration) at GSI looked for a narrow sum-energy ${{\mathit e}^{+}}{{\mathit e}^{-}}$ -line at $\sim{}635~$keV in ${}^{238}\mathrm {U}+{}^{181}\mathrm {Ta}$ collision. Limits on the production probability for a narrow sum-energy ${{\mathit e}^{+}}{{\mathit e}^{-}}$ line are set. See their Table$~$2.
4  GANZ 1996 (EPos$~$II Collaboration) has placed upper bounds on the production cross section of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ pairs from ${}^{238}\mathrm {U}+{}^{181}\mathrm {Ta}$ and ${}^{238}\mathrm {U}+{}^{232}\mathrm {Th}$ collisions at GSI. See Table$~$2 for limits both for back-to-back and isotropic configurations of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ pairs. These limits rule out the existence of peaks in the ${{\mathit e}^{+}}{{\mathit e}^{-}}$ sum-energy distribution, reported by an earlier version of this experiment.
5  KAMEL 1996 looked for ${{\mathit e}^{+}}{{\mathit e}^{-}}$ pairs from the collision of ${}^{32}\mathrm {S}$ (200$~$GeV/nucleon) and emulsion. No evidence of mass peaks is found in the region of sensitivity ${\mathit m}_{\mathrm { {{\mathit e}} {{\mathit e}} }}>$2 MeV.
6  BLUEMLEIN 1992 is a proton beam dump experiment at Serpukhov with a secondary target to induce Bethe-Heitler production of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ from the produce ${{\mathit A}^{0}}$. See Fig.$~$5 for the excluded region in ${\mathit m}_{{{\mathit A}^{0}}}-\mathit x$ plane. For the standard axion, $0.3<\mathit x<$25 is excluded at 95$\%$ CL. If combined with BLUEMLEIN 1991 , $0.008<\mathit x<$32 is excluded.
7  MEIJERDREES 1992 give $\Gamma\mathrm {( {{\mathit \pi}^{-}} {{\mathit p}} \rightarrow {{\mathit n}} {{\mathit A}^{0}} )}\cdot{}$B( ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ )$/\Gamma\mathrm {( {{\mathit \pi}^{-}} {{\mathit p}} \rightarrow all)}$ $<10^{-5}$ (90$\%$ CL) for ${\mathit m}_{{{\mathit A}^{0}}}$ = 100 MeV, ${\mathit \tau}_{{{\mathit A}^{0}}}$ = $10^{-11} - 10^{-23}~$sec. Limits ranging from $2.5 \times 10^{-3}$ to $10^{-7}$ are given for ${\mathit m}_{{{\mathit A}^{0}}}$ = $25 - 136$ MeV.
8  BLUEMLEIN 1991 is a proton beam dump experiment at Serpukhov. No candidate event for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , 2${{\mathit \gamma}}$ are found. Fig.$~$6 gives the excluded region in ${\mathit m}_{{{\mathit A}^{0}}}-\mathit x$ plane ($\mathit x~$= tan $\beta$ = $\mathit v_{2}/\mathit v_{1}$). Standard axion is excluded for $0.2$ $<$ ${\mathit m}_{{{\mathit A}^{0}}}$ $<$ $3.2$ MeV for most $\mathit x~>~$1, $0.2 - 11$ MeV for most $\mathit x~<~$1.
9  FAISSNER 1989 searched for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ in a proton beam dump experiment at SIN. No excess of events was observed over the background. A standard axion with mass 2${\mathit m}_{{{\mathit e}}}-$20 MeV is excluded. Lower limit on $\mathit f_{{{\mathit A}^{0}}}$ of $\simeq{}10^{4}$ GeV is given for ${\mathit m}_{{{\mathit A}^{0}}}$ = 2${\mathit m}_{{{\mathit e}}}-$20 MeV.
10  DEBOER 1988 reanalyze EL-NADI 1988 data and claim evidence for three distinct states with mass $\sim{}1.1$, $\sim{}2.1$, and $\sim{}9$ MeV, lifetimes $10^{-16}-10^{-15}~$s decaying to ${{\mathit e}^{+}}{{\mathit e}^{-}}$ and note the similarity of the data with those of a cosmic-ray experiment by Bristol group (B.M.$~$Anand, Proc. of the Royal Society of London, Section A A22 183 (1953)). For a criticism see PERKINS 1989 , who suggests that the events are compatible with ${{\mathit \pi}^{0}}$ Dalitz decay. DEBOER 1989B is a reply which contests the criticism.
11  EL-NADI 1988 claim the existence of a neutral particle decaying into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ with mass $1.60$ $\pm0.59$ MeV, lifetime ($0.15$ $\pm0.01$) $\times 10^{-14}~$s, which is produced in heavy ion interactions with emulsion nuclei at $\sim{}$4 GeV/$\mathit c$/nucleon.
12  FAISSNER 1988 is a proton beam dump experiment at SIN. They found no candidate event for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ . A standard axion decaying to 2${{\mathit \gamma}}$ is excluded except for a region $\mathit x\simeq{}$1. Lower limit on $\mathit f_{{{\mathit A}^{0}}}$ of $-10^{3}$ GeV is given for ${\mathit m}_{{{\mathit A}^{0}}}$ = $0.1-1$ MeV.
13  BADIER 1986 did not find long-lived ${{\mathit A}^{0}}$ in 300 GeV ${{\mathit \pi}^{-}}$ Beam Dump Experiment that decays into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ in the mass range ${\mathit m}_{{{\mathit A}^{0}}}$ = (20$-$200) MeV, which excludes the ${{\mathit A}^{0}}$ decay constant $\mathit f({{\mathit A}^{0}}$) in the interval (60$-$600) GeV. See their figure 6 for excluded region on $\mathit f({{\mathit A}^{0}})-{\mathit m}_{{{\mathit A}^{0}}}$ plane.
14  BERGSMA 1985 look for ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$ , ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ . First limit above is for ${\mathit m}_{{{\mathit A}^{0}}}$ = 1 MeV; second is for 200 MeV. See their figure 4 for excluded region on $\mathit f_{{{\mathit A}^{0}}}–{\mathit m}_{{{\mathit A}^{0}}}$ plane, where $\mathit f_{{{\mathit A}^{0}}}$ is ${{\mathit A}^{0}}$ decay constant. For Peccei-Quinn PECCEI 1977 ${{\mathit A}^{0}}$, ${\mathit m}_{{{\mathit A}^{0}}}$ $<$180 keV and $\tau$ $>$0.037 s. (CL = 90$\%$). For the axion of FAISSNER 1981B at 250 keV, BERGSMA 1985 expect 15 events but observe zero.
15  FAISSNER 1983 observed 19 1-${{\mathit \gamma}}$ and 12 2-${{\mathit \gamma}}$ events where a background of 4.8 and 2.3 respectively is expected. A small-angle peak is observed even if iron wall is set in front of the decay region.
16  FAISSNER 1983B extrapolate SIN ${{\mathit \gamma}}$ signal to LAMPF ${{\mathit \nu}}$ experimental condition. Resulting 370 ${{\mathit \gamma}}$'s are not at variance with LAMPF upper limit of 450 ${{\mathit \gamma}}$'s. Derived from LAMPF limit that $\lbrack{}\mathit d{\mathit \sigma (}{{\mathit A}^{0}}{)}/\mathit d\omega$ at 90$^\circ{}\rbrack{}{}{\mathit m}_{{{\mathit A}^{0}}}/{\mathit \tau}_{{{\mathit A}^{0}}}$ $<14 \times 10^{-35}$ cm${}^{2}{}$ sr${}^{-1}{}$ MeV ${}$ms${}^{-1}$. See comment on FRANK 1983B.
17  FRANK 1983B stress the importance of LAMPF data bins with negative net signal. By statistical analysis say that LAMPF and SIN-A0 are at variance when extrapolation by phase-space model is done. They find LAMPF upper limit is 248 not 450 ${{\mathit \gamma}}$'s. See comment on FAISSNER 1983B.
18  HOFFMAN 1983 set CL = 90$\%$ limit $\mathit d\sigma{}/\mathit dt{}$ B( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) $<3.5 \times 10^{-32}$ cm${}^{2}$/GeV${}^{2}$ for 140 $<{\mathit m}_{{{\mathit A}^{0}}}$ $<$160 MeV. Limit assumes $\tau\mathrm {({{\mathit A}^{0}})}$ $<10^{-9}$ s.
19  FETSCHER 1982 reanalyzes SIN beam-dump data of FAISSNER 1981 . Claims no evidence for axion since 2-${{\mathit \gamma}}$ peak rate remarkably decreases if iron wall is set in front of the decay region.
20  FAISSNER 1981 see excess ${{\mathit \mu}}{{\mathit e}}$ events. Suggest axion interactions.
21  FAISSNER 1981B is SIN 590 MeV proton beam dump. Observed $14.5$ $\pm5.0$ events of 2${{\mathit \gamma}}$ decay of long-lived neutral penetrating particle with ${\mathit m}_{\mathrm {2{{\mathit \gamma}}}}{ {}\lesssim{} }$1 MeV. Axion interpretation with ${{\mathit \eta}}-{{\mathit A}^{0}}$ mixing gives ${\mathit m}_{{{\mathit A}^{0}}}$ = $250$ $\pm25$ keV, $\tau _{(2{{\mathit \gamma}})}$ = $0.0073$ $\pm0.0037~$s from above rate. See critical remarks below in comments of FETSCHER 1982 , FAISSNER 1983 , FAISSNER 1983B, FRANK 1983B, and BERGSMA 1985 . Also see in the next subsection ALEKSEEV 1982B, CAVAIGNAC 1983 , and ANANEV 1985 .
22  KIM 1981 analyzed 8 candidates for ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$ obtained by Aachen-Padova experiment at CERN with 26 GeV protons on Be. Estimated axion mass is about 300 keV and lifetime is (0.86$\sim{}5.6){\times }10^{-3}~$s depending on models. Faissner (private communication), says axion production underestimated and mass overestimated. Correct value around 200 keV.
23  FAISSNER 1980 is SIN beam dump experiment with 590 MeV protons looking for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ decay. Assuming ${{\mathit A}^{0}}/{{\mathit \pi}^{0}}$ = $5.5 \times 10^{-7}$, obtained decay rate limit 20/(${{\mathit A}^{0}}$ mass) MeV/s (CL = 90$\%$), which is about $10^{-7}$ below theory and interpreted as upper limit to ${\mathit m}_{{{\mathit A}^{0}}}$ $<2{}{\mathit m}_{{{\mathit e}^{-}}}$.
24  JACQUES 1980 is a BNL beam dump experiment. First limit above comes from nonobservation of excess neutral-current-type events $\lbrack{}{\mathit \sigma (}$production${)}{}{\mathit \sigma (}$interaction${)}$ $<7. \times 10^{-68}$ cm${}^{4}$, CL = 90$\%\rbrack{}$. Second limit is from nonobservation of axion decays into 2${{\mathit \gamma}}$'s or ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , and for axion mass a few MeV.
25  SOUKAS 1980 at BNL observed no excess of neutral-current-type events in beam dump.
26  BECHIS 1979 looked for the axion production in low energy electron Bremsstrahlung and the subsequent decay into either 2${{\mathit \gamma}}$ or ${{\mathit e}^{+}}{{\mathit e}^{-}}$ . No signal found. CL = 90$\%$ limits for model parameter(s) are given.
27  COTEUS 1979 is a beam dump experiment at BNL.
28  DISHAW 1979 is a calorimetric experiment and looks for low energy tail of energy distributions due to energy lost to weakly interacting particles.
29  BELLOTTI 1978 first value comes from search for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ . Second value comes from search for ${{\mathit A}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$ , assuming mass $<2{}{\mathit m}_{{{\mathit e}^{-}}}$. For any mass satisfying this, limit is above value${\times }$(mass${}^{-4}$). Third value uses data of PL 60B 401 and quotes ${\mathit \sigma (}$production${)}{}{\mathit \sigma (}$interaction${)}$ $<$ $10^{-67}$ cm${}^{4}$.
30  BOSETTI 1978B quotes ${\mathit \sigma (}$production${)}{}{\mathit \sigma (}$interaction${)}$ $<2. \times 10^{-67}$ cm${}^{4}$.
31  DONNELLY 1978 examines data from reactor neutrino experiments of REINES 1976 and GURR 1974 as well as SLAC beam dump experiment. Evidence is negative.
32  MICELMACHER 1978 finds no evidence of axion existence in reactor experiments of REINES 1976 and GURR 1974 . (See reference under DONNELLY 1978 below).
33  VYSOTSKII 1978 derived lower limit for the axion mass 25 keV from luminosity of the sun and 200 keV from red supergiants.
References:
 JAIN 2007
JP G34 129 Search for New Particles Decaying into Electron Pairs of Mass below 100 MeV/$\mathit c{}^{2}$
 AHMAD 1997
PRL 78 618 Search for Monoenergetic Positron Emission from Heavy Ion Collisions at Coulomb Barrier Energies
 LEINBERGER 1997
PL B394 16 New Results on ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Line Emission in ${}^{}\mathrm {U}{}^{}\mathrm {Ta}$ Collisions
 GANZ 1996
PL B389 4 Search for ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Pairs with Narrow Sum Energy Distributions in Heavy Ion Collisions
 KAMEL 1996
PL B368 291 Direct Electron Pair Production by 6.4 TeV ${}^{32}\mathrm {S}$ Emulsion Interactions
 BLUEMLEIN 1992
IJMP A7 3835 Limits on the Mass of Light (Pseudo)scalar Particles from Bethe-Heitler ${{\mathit e}^{+}}{{\mathit e}^{-}}$ and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ Pair Production in Proton-Iron Beam Dump Experiment
 MEIJERDREES 1992
PRL 68 3845 Search for Weakly Interacting Neutral Bosons Produced in ${{\mathit \pi}^{-}}{{\mathit p}}$ Interactions at Rest and Decaying into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Pairs
 BLUEMLEIN 1991
ZPHY C51 341 Limits on Neutral Light Scalar and Pseudoscalar Particles in Proton Beam Dump Experiment
 FAISSNER 1989
ZPHY C44 557 Search for the Electron Positron Decay of an AxionLike Particle from a 590 MeV Proton Beam Dump
 DEBOER 1988
PRL 61 1274 Possible Observation of Light Neutral Bosons in Nuclear Emulsions
 EL-NADI 1988
PRL 61 1271 Production of a New Light Neutral Boson in High Energy Collisions
 FAISSNER 1988
ZPHY C37 231 Search for Two Photon Decay of a Light Penetrating Particle from 590 MeV Proton Beam Dump
 BADIER 1986
ZPHY C31 21 Mass and Lifetime Limits on New Longlived Particles in 300 ${\mathrm {GeV/}}\mathit c$ ${{\mathit \pi}^{-}}$ Interactions
 BERGSMA 1985
PL 157B 458 Search for Axion Like Particle Production in 400 GeV Proton Copper Interactions
 FAISSNER 1983
PR D28 1198 Further Evidence for the Radiative Decay of a Light, Penetrating Particle
 FAISSNER 1983B
PR D28 1787 Direct Comparison Between the ${{\mathit \gamma}}$ Ray Fluxes from Proton Beam Dumps at LAMPF and SIN
 FRANK 1983B
PR D28 1790 Reply to FAISSNER 1983B Direct Comparison between the ${{\mathit \gamma}}$ Ray Fluxes from Proton Beam Dumps at LAMPF and SIN''
 HOFFMAN 1983
PR D28 660 Measurement of ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ at 300 ${\mathrm {MeV}}/\mathit c$ and a Search for Scalar and Vector Bosons Heavier than the ${{\mathit \pi}^{0}}$
 FETSCHER 1982
JP G8 L147 Comment on the Observation of the Two-Photon Decay of a Light Penetrating Particle (Phys.Lett., B103, 234. H.Faissner et al.)
 FAISSNER 1981B
PL 103B 234 Observation of the Two Photon Decay of a Light Penetrating Particle
 FAISSNER 1981
ZPHY C10 95 Observation of Anomalous Muon Electron Pairs in a Neutrino Exposure
 KIM 1981
PL 105B 55 Axion Production in High Energy Proton Nucleon Scattering and an Estimate of its Mass
 FAISSNER 1980
PL 96B 201 Limit on Axion Decay into an Electron Pair
 JACQUES 1980
PR D21 1206 Search for Prompt Neutrinos and Penetrating Neutral Particles in a Beam Dump Experiment at Brookhaven
 SOUKAS 1980
PRL 44 564 A Search for Prompt Neutrinos and New Penetrating Particles from 28 GeV Proton Nucleus Collisions
 BECHIS 1979
PRL 42 1511 Search for Axion Production in Low Energy Electron Bremsstrahlung
 COTEUS 1979
PRL 42 1438 Search for New Particles at the Alternating Gradient Synchrotron Beam Dump
 DISHAW 1979
PL 85B 142 Limits on the Production of Neutrino Like Particles in Proton Nucleus Interactions from Calorimetry Measurements
 ALIBRAN 1978
PL 74B 134 Observation of an Excess of Electron Neutrino, Anti-electron-neutrino Events in a Beam Dump Experiment at 400 GeV
 ASRATYAN 1978B
PL 79B 497 Search for Prompt Neutrinos in 70 GeV ${{\mathit p}}{{\mathit n}}$ Collisions
 BELLOTTI 1978
PL 76B 223 Experimental Limits on Axion Production and Interaction Cross Sections, and Decay Rate
 BOSETTI 1978B
PL 74B 143 Observation of Prompt Neutrinos from 400 GeV Proton Nucleus Collisions
 DONNELLY 1978
PR D18 1607 Do Axions Exist?
 HANSL 1978D
PL 74B 139 Results of a Beam Dump Experiment at the CERN SPS Neutrino Facility
 MICELMACHER 1978
LNC 21 441 Evidence Against Axions from Reactor Experiments
 VYSOTSKII 1978
JETPL 27 502 Some Astrophysical Limitations on Axion Mass
 REINES 1976
PRL 37 315 Detection of ${{\overline{\mathit \nu}}_{{e}}}{{\mathit e}^{-}}$ Scattering
 GURR 1974
PRL 33 179 Neutral Current Limit and Future Prospect at a Reactor