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in creator/contributor: "Kaplan, D. M."

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Production of Hadrons and Leptons at High p/sub t/ and Pairs at High Mass

The experiment reported extends to higher beam energy the measurements of high-p/sub t/ particle production and high-mass pair production in N-N collisions, with improved resolution, particle identification, and luminosity. Besides addressing quantum chromodynamics issues, limits are set on the mass and lifetime of the axion. 25 refs., 19 figs. (LEW)

Date: January 1, 1986

Creator: Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A high-rate fixed-target charm experiment

In the P865 Letter of Intent, we have proposed a fixed-target experiment aimed at achieving high sensitivity to decays both of charm and of beauty. I describe here a revised version which is somewhat more optimized for charm and less so for beauty. The rationale for this change of emphasis is two-fold: by the time a new fixed-target experiment might run ({approx} Year 2000), it is likely that studies of beauty at the level proposed in P865 win no longer be competitive; furthermore, it may well … more

Date: July 1, 1994

Creator: Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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E789 and P865: High-rate fixed-target studies of charm and beauty

Experiment 789 at Fermilab used the high-rate E605/E772 spectrometer to study low-multiplicity charm and beauty decays. Preliminary results on charm and beauty production are presented based on analysis of [approx] 100% of the charm data and [approx] 50% of the beauty data. A new experiment is proposed to improve charm and beauty sensitivity by several orders of magnitude.

Date: June 1, 1993

Creator: Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Status of MICE

Muon ionization cooling is the only practical method for preparing high-brilliance beams needed for a neutrino factory or muon collider. The muon ionization cooling experiment (MICE) under development at the Rutherford Appleton Laboratory comprises a dedicated beamline to generate a range of input emittance and momentum, with time-of-flight and Cherenkov detectors to ensure a pure muon beam. A first measurement of emittance is performed in the upstream magnetic spectrometer with a scintillating… more

Date: November 1, 2008

Creator: Bross, A. D. & Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The HyperCP data acquisition system

For the HyperCP experiment at Fermilab, we have assembled a data acquisition system that records on up to 45 Exabyte 8505 tape drives in parallel at up to 17 MB/s. During the beam spill, data are acquired from the front-end digitization systems at {approx} 60 MB/s via five parallel data paths. The front-end systems achieve typical readout deadtime of {approx} 1 {micro}s per event, allowing operation at 75-kHz trigger rate with {approx_lt}30% deadtime. Event building and tapewriting are handled … more

Date: June 1, 1997

Creator: Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Muon Collider/Neutrino Factory: Status and prospects

During the 1990s an international collaboration has been studying the possibility of constructing and operating a high-energy high-luminosity {mu}{sup +}{mu}{sup {minus}} collider. Such a machine could be the approach of choice to extend the discovery reach beyond that of the LHC. More recently, a growing collaboration is exploring the potential of a stored-muon-beam neutrino factory to elucidate neutrino oscillations. A neutrino factory could be an attractive stepping-stone to a muon collider.… more

Date: January 26, 2000

Creator: Kaplan, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Backgrounds to the detection of two-body hadronic B decays

We consider backgrounds to the detection of the two-body hadronic decay modes of neutral B mesons and baryons. The largest background is due to the correlated production of pairs of high-p/sub T/ hadrons in the target, but this can be adequately rejected provided the experimental apparatus has sufficient resolution in mass and decay vertex. Another possible source of background arises from the production and decay of charmed and strange particles. Since these particles can travel considerable d… more

Date: January 8, 1988

Creator: Kaplan, D. M.; Peng, Jen-Chieh; Abrams, G. S. & Stockdale, I. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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E789 and P865: High-rate fixed-target studies of charm and beauty

Experiment 789 at Fermilab used the high-rate E605/E772 spectrometer to study low-multiplicity charm and beauty decays. Preliminary results on charm and beauty production are presented based on analysis of {approx} 100% of the charm data and {approx} 50% of the beauty data. A new experiment is proposed to improve charm and beauty sensitivity by several orders of magnitude.

Date: June 1, 1993

Creator: Kaplan, D. M. & Collaborations, E789 and P865

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Issues for high-luminosity fixed-target rare-B-decay experiments

Fermilab E789 is the prototype of a new approach to the study of heavy-quark decays using fixed target. The apparatus acceptance is restricted to charged particles of relatively large momentum emerging at relatively large angles, allowing operation at high interaction rates. At rates up to 10 interactions per RF-bucket, the experiment may have sensitivity at the level of 10{sup {minus}6} per running period for such rare decay modes as B {yields} {pi}{sup +}{pi}{sup {minus}}. Could such an appro… more

Date: October 1, 1990

Creator: Kaplan, D.M. (Northern Illinois Univ., Dekalb, IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A fast ring-imaging Cherenkov counter for a fixed-target heavy-quark experiment

We present a design for a fast ring-imaging Cherenkov counter operating in the visible. The Cherenkov photons are imaged on an array of small Winston cones and read out with optical fibers and VLPCs. the design is optimized for {pi}/K/p separation in the range 10 < p < 100 GeV/c.

Date: June 1, 1993

Creator: Kaplan, D. M.; Isenhower, L. D.; Atac, M.; Brown, C. N. & Darden, C. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The intergration of liquid and solid muon absorbers into afocusing magnet of a muon cooling channel

This report describes how one can integrate the muonabsorber with the focusing coils of a SFOFO muon cooling channel [1]. Theabsorber material must be a low Z material that reduces the muon momentumwith minimum scattering. The best materials to use for muon ionizationcooling absorbers are hydrogen, helium, lithium hydride, lithium, andberyllium. Hydrogen or helium in an absorber would normally be in theliquid state. Lithium hydride, lithium, and beryllium would normally bein the solid state. Th… more

Date: May 1, 2003

Creator: Green, M. A.; Black, E. L.; Cummings, M. A.; Kaplan, D. M.; Ishimoto, S.; Cobb, J. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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An Ionization Cooling Channel for Muon Beams Based on Alternating Solenoids.

The muon collider requires intense, cooled muon bunches to reach the required luminosity. Due to the limited life-time of the muon, the cooling process must take place very rapidly. Ionization cooling seems to be our only option, given the large emittances of the muon beam from pion decay. However, this ionization cooling method has been found quite difficult to implement in practice. We describe a scheme based on the use of liquid hydrogen absorbers followed by r.f. cavities (''pillbox'' or ''… more

Date: March 29, 1999

Creator: Gallardo, J. C.; Fernow, R. C.; Kirk, H. G.; Palmer, R. B.; Lebrun, P.; Moretti, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Opportunities for high-sensitivity charm physics at Fermilab

The CO initiative under consideration at Fermilab makes feasible a charm experiment reconstructing >10{sup 9} charm decays, four orders - of magnitude beyond the largest extant sample. The experiment might commence data-taking as early as 1999. In addition to programmatic charm physics such as spectroscopy, lifetimes, and QCD tests, it will have significant new-physics reach in the areas of CP violation, flavor-changing neutral-current and lepton-number-violating decays, and D{sup o} {bar D} {b… more

Date: July 1, 1996

Creator: Kaplan, D. M.; Burnstein, R. A.; Lederman, L. M.; Rubin, H. A.; Brown, C. N.; Christian, D. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear effects in Drell-Yan and quarkonium production in proton-nucleus collisions

A precise measurement of the atomic mass dependence of dimuon production induced by 800 GeV protons incident on targets of {sup 2}H, C, Ca, Fe, and W is reported. The relative Drell-Yan yield per nucleon, R = Y{sub A}/Y{sub 2{sub H}}, is sensitive to modifications of the antiquark sea in nuclei. No effect is seen for the range of target-quark momentum fraction, 0.1 < x{sub t} < 0.3. For x{sub t} < 0.1 the ratio is slightly less than unity for the heavy nuclei. These results are compared with th… more

Date: January 1, 1990

Creator: Peng, J. C.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T.; Klein, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the asymmetry in the decay Antiomega+ ---> Antilambda K+ ---> anti-p pi+ K+

The asymmetry in the {bar p} angular distribution in the sequential decay {bar {Omega}}{sup +} {yields} {bar {Lambda}}K{sup +} {yields} {bar p}{pi}{sup +}K{sup +} has been measured to be {bar {alpha}}{sub {Omega}}{bar {alpha}}{sub {Lambda}} = [+1.16{+-}0.18(stat){+-}0.17(syst)]x10{sup -2} using 1.89x10{sup 6} unpolarized {bar {Omega}}{sup +} decays recorded by the Hyper CP (E871) experiment at Fermilab. Using the known value of {alpha}{sub {Lambda}}, and assuming that {bar {alpha}}{sub {Lambda}… more

Date: January 1, 2006

Creator: Lu, L. C.; Burnstein, R. A.; Chakravorty, A.; Chen, Y. C.; Choong, W. S.; Clark, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nuclear medium effects on quarks, gluons, and on vector meson production: New insights from dimuon production

A precise measurement of the atomic mass dependence of dimuon continuum and vector-meson production induced by 800 GeV/c protons is reported. Approximately 700,000 muon pairs with dimuon mass M {ge} 3 GeV were recorded from targets of {sup 2}H, C, Ca, Fe, and W. The ratio of Drell-Yan dimuon yield per nucleon for nuclei versus {sup 2}H, R = Y{sub A}/Y{sub 2H}, is sensitive to modifications of the antiquark sea in nuclei. No nuclear dependence of this ratio is observed over the range of target-q… more

Date: January 1, 1990

Creator: Leitch, M. J.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T.; Klein, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Observation of parity violation in the Omega- ---> Lambda K- decay

The {alpha} decay parameter in the process {Omega}{sup -} {yields} {Lambda}K{sup -} has been measured from a sample of 4.50 million unpolarized {Omega}{sup -} decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 {+-} 0.19(stat) {+-} 0.16(syst)] x 10{sup -2}. This is the first unambiguous evidence for a nonzero {alpha} decay parameter, and hence parity violation, in the {Omega}{sup -} {Lambda}K{sup -} decay.

Date: May 1, 2005

Creator: Lu, L. C.; U., /Virginia; Burnstein, R. A.; Chakravorty, A.; Chen, Y. C.; Choong, W.-S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Evidence for the decay Sigma+ ---> p mu+ mu-

We report the first evidence for the decay {Sigma}{sup +} {yields} p{mu}{sup +}{mu}{sup -} from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is {Beta}({Sigma}{sup +} {yields} p{mu}{sup +}{mu}{sup -}) = [8.6{sub -5.4}{sup +6.6}(stat) {+-} 5.5(syst)] x 10{sup -8}. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, {Sigma}{sup +} {yields} pP{sup 0},P{sup 0} {yields} {mu}{sup +}{mu}… more

Date: January 1, 2005

Creator: Park, HyangKyu; U., /Michigan; Burnstein, R. A.; Chakravorty, A.; Chen, Y. C.; Choong, W. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for Delta S = 2 nonleptonic hyperon decays

A sensitive search for the rare decays {Omega}{sup -} {yields} {Lambda}{pi}{sup -} and {Xi}{sup 0} {yields} p{pi}{sup -} has been performed using data from the 1997 run of the HyperCP (Fermilab E871) experiment. Limits on other such processes do not exclude the possibility of observable rates for |{Delta}S| = 2 nonleptonic hyperon decays, provided the decays occur through parity-odd operators. They obtain the branching-fraction limits {Beta}({Omega}{sup -} {yields} {Lambda}{pi}{sup -}) < 2.9… more

Date: March 1, 2005

Creator: White, C. G.; /IIT, Chicago; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Chen, Y. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for the lepton-number-violating decay Xi- ---> p mu- mu-

No Description Available.

Date: May 1, 2005

Creator: Rajaram, D.; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Chen, Y. C.; Choong, W. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the alpha asymmetry parameter for the Omega- ---> Lambda K- decay

No Description Available.

Date: February 1, 2005

Creator: Chen, Y. C.; /Taiwan, Inst. Phys.; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Choong, W. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for CP violation in charged-Xi and Lambda hyperon decays

The authors have compared the p and {bar p} angular distributions in 117 million {Xi}{sup -} {yields} {Lambda}{pi}{sup -} {yields} p{pi}{sup -}{pi}{sup -} and 41 million {Xi}{sup +} {yields} {bar {Lambda}}{pi}{sup +} {yields} {bar p}{pi}{sup +}{pi}{sup +} decays using a subset of the data from the HyperCP experiment (ES71) at Fermilab. They find no evidence of CP violation, with the direct-CP-violating parameter A{sub {Xi}{Lambda}} {triple_bond} (a{sub {Xi}}a{sub {Lambda}} - {bar a}{sub {Xi}}{b… more

Date: December 1, 2004

Creator: Holmstrom, T.; Leros, N.; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Chen, Y. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Examining CP symmetry in strange baryon decay

Non-conservation of CP symmetry can manifest itself in non-lepton ichyperon decays as a difference in the decay parameter between the strange-baryon decay and its charge conjugate. By comparing the decay distribution in the {Lambda} helicity frame for the decay sequence {Xi}{sup -} {yields} {Lambda}{pi}{sup -}, {Lambda} {yields} p{pi}{sup -} with that of {bar {Xi}}{sup +} decay, E756 at Fermilab did not observe any CP-odd effect at the 10{sup -2} level. The status of a follow-up experiment, Hyp… more

Date: April 5, 2000

Creator: Luk, Kam-Biu; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Chen, Y. C.; Choong, W. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Preliminary results from Fermilab E789

Fermilab experiment 789 studies low-multiplicity decays of neutral D and B mesons in a high-rate fixed-target environment. Preliminary results from the 1991 run are presented.

Date: December 1, 1992

Creator: Peng, J. C.; Boissevain, J.; Carey, T. A.; Jansen, D. M.; Jeppesen, R.; Kapustinsky, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department