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49 results on '"Lüth, V."'

1. Challenges in semileptonic B decays

Author

Gambino, P, Kronfeld, AS, Rotondo, M, Schwanda, C, Bernlochner, F, Bharucha, A, Bozzi, C, Calvi, M, Cao, L, Ciezarek, G, Davies, CTH, El-Khadra, AX, Hashimoto, S, Jung, M, Khodjamirian, A, Ligeti, Z, Lunghi, E, Lüth, V, Mannel, T, Meinel, S, Paz, G, Schacht, S, Simula, S, Sutcliffe, W, and Avilés-Casco, A Vaquero

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ph, hep-ex, hep-lat, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

Two of the elements of the Cabibbo–Kobayashi–Maskawa quark mixing matrix, | Vub| and | Vcb| , are extracted from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, remain puzzling, because for both | Vub| and | Vcb| the exclusive and inclusive determinations are in clear tension. Further, measurements in the τ channels at Belle, Babar, and LHCb show discrepancies with the Standard Model predictions, pointing to a possible violation of lepton flavor universality. LHCb and Belle II have the potential to resolve these issues in the next few years. This article summarizes the discussions and results obtained at the MITP workshop held on April 9–13, 2018, in Mainz, Germany, with the goal to develop a medium-term strategy of analyses and calculations aimed at solving the puzzles. Lattice and continuum theorists working together with experimentalists have discussed how to reshape the semileptonic analyses in view of the much higher luminosity expected at Belle II, searching for ways to systematically validate the theoretical predictions in both exclusive and inclusive B decays, and to exploit the rich possibilities at LHCb.

Published
2020

2. The Physics of the B Factories

Author

Bevan, AJ, Golob, B, Mannel, T, Prell, S, Yabsley, BD, Aihara, H, Anulli, F, Arnaud, N, Aushev, T, Beneke, M, Beringer, J, Bianchi, F, Bigi, II, Bona, M, Brambilla, N, Brodzicka, J, Chang, P, Charles, MJ, Cheng, CH, Cheng, HY, Chistov, R, Colangelo, P, Coleman, JP, Drutskoy, A, Druzhinin, VP, Eidelman, S, Eigen, G, Eisner, AM, Faccini, R, Flood, KT, Gambino, P, Gaz, A, Gradl, W, Hayashii, H, Higuchi, T, Hulsbergen, WD, Hurth, T, Iijima, T, Itoh, R, Jackson, PD, Kass, R, Kolomensky, YG, Kou, E, Križan, P, Kronfeld, A, Kumano, S, Kwon, YJ, Latham, TE, Leith, DWGS, Lüth, V, Martinez-Vidal, F, Meadows, BT, Mussa, R, Nakao, M, Nishida, S, Ocariz, J, Olsen, SL, Pakhlov, P, Pakhlova, G, Palano, A, Pich, A, Playfer, S, Poluektov, A, Porter, FC, Robertson, SH, Roney, JM, Roodman, A, Sakai, Y, Schwanda, C, Schwartz, AJ, Seidl, R, Sekula, SJ, Steinhauser, M, Sumisawa, K, Swanson, ES, Tackmann, F, Trabelsi, K, Uehara, S, Uno, S, van de Water, R, Vasseur, G, Verkerke, W, Waldi, R, Wang, MZ, Wilson, FF, Zupan, J, Zupanc, A, Adachi, I, Albert, J, Banerjee, S, Bellis, M, Ben-Haim, E, Biassoni, P, Cahn, RN, Cartaro, C, Chauveau, J, Chen, C, Chiang, CC, Cowan, R, and Dalseno, J

Subjects
hep-ex, hep-ph, Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

This work is on the Physics of the B Factories. Part A of this book containsa brief description of the SLAC and KEK B Factories as well as their detectors,BaBar and Belle, and data taking related issues. Part B discusses tools andmethods used by the experiments in order to obtain results. The resultsthemselves can be found in Part C. Please note that version 3 on the archive is the auxiliary version of thePhysics of the B Factories book. This uses the notation alpha, beta, gamma forthe angles of the Unitarity Triangle. The nominal version uses the notationphi_1, phi_2 and phi_3. Please cite this work as Eur. Phys. J. C74 (2014) 3026.

Published
2014

3. Inclusive charged hadron and K0 production in two-photon interactions

Author

Cords, D, Boyer, J, Butler, F, Gidal, G, Abrams, GS, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Gold, MS, Goldhaber, G, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Nelson, ME, Ong, RA, Perl, ML, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Trilling, GH, Wood, DR, and Yelton, JM

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The inclusive transverse momentum distributions of charged hadrons and K0's produced in tagged photon-photon collisions, are measured and compared to model calculations up to a pT of 5 GeV/c. The relative abundance of K0's favor the inclusion of charm. © 1993.

Published
1993

4. Measurement of the charged multiplicity of events containing bottom hadrons at Ec. m.=91 GeV

Author

Schumm, BA, Koetke, DS, Adolphsen, CE, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Rouse, FR, Rust, DR, Sadrozinski, HFW, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, Soderstrom, E, Stoker, DP, Stroynowski, R, Swartz, M, Thun, R, and Trilling, GH

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Using an impact-parameter tag to select an enriched sample of Z0bb» events, we have measured the difference between the average charged multiplicity of bb» and all hadronic Z0 decays to be 2.11.8(stat) 0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for Z0 bb» events is 23.1(12.0)1.8 0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in Z0 decays of xEb=0.620.100.04. © 1992 The American Physical Society.

Published
1992

5. Measurement of the total hadronic cross section in e+e- annihilation at s=29 GeV

Author

von Zanthier, C, de Boer, W, Grindhammer, G, Hylen, J, Harral, B, Hearty, C, Labarga, L, Matthews, J, Schaad, M, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, and Schalk, TL

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

A precise measurement of the ratio R of the total cross section e+e-hadrons to the pointlike cross section e+e-+- at a center-of-mass energy of 29.0 GeV is presented. The data were taken with the upgraded Mark II detector at the SLAC storage ring PEP. The result is R=3.920.050.09. The luminosity has been determined with three independent luminosity monitors measuring Bhabha scattering at different angular intervals. Recent calculations of higher-order QED radiative corrections are used to estimate the systematic error due to missing higher-order radiative corrections in the Monte Carlo event generators. © 1991 The American Physical Society.

Published
1991

6. Test of QED to fourth order by study of four-lepton final states in e+e- interactions at 29 GeV with the Mark II detector.

Author

Petradza, M, Thun, R, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, A, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Haggerty, J, Jaros, JA, Kadyk, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Yelton, JM

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have tested QED to fourth order in the coupling constant in the large-Q2 region by studying four-lepton final states in e+e- interactions with the Mark II detector at the SLAC storage ring PEP (s=29 GeV). All four final-state particles were detected at large angles with respect to the beam axis. For an integrated luminosity of 205 pb-1, we observed ten e+e-e+e-, ten e+e-+-, and one events with opposite-charge pair masses greater than 1 GeV/c2. These events show good agreement with the complete 4 QED calculation. © 1990 The American Physical Society.

Published
1990

7. Two-photon production of pion pairs.

Author

Boyer, J, Butler, F, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Gold, MS, Golding, L, Goldhaber, G, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Barklow, T, Boyarski, A, Burchat, P, Burke, DL, Cords, D, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Yelton, JM, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We present a new high-statistics measurement of the cross section for the process e+e-e+e-+- at a center-of-mass energy of 29 GeV for invariant pion-pair masses M(+-) between 350 MeV/c2 and 1.6 GeV/c2. We observe the f2(1270) and measure its radiative width to be 3.15±0.04±0.39 keV. We also observe an enhancement in the +- spectrum near 1 GeV. General agreement is found with unitarized models of the +- reaction that include final-state interactions. © 1990 The American Physical Society.

Published
1990

8. Measurement of the two-photon width of the eta '(958).

Author

Butler, F, Boyer, J, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Riles, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Yelton, JM, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Using 203 pb-1 of data collected by the Mark II detector at the SLAC storage ring PEP, we have measured the radiative width of the for quasireal photons. The width is separately measured in the three reactions e+e-e+e-0+-,0; e+e-e+e-0+-; 0+-(0,), and e+e-e+e-0, giving a statistically weighted average two-photon width of=4.57±0.25±0.44 keV. As a byproduct of the study of the decay mode, we also measured the two-photon decay width of the a2(1320) as a2(1320)=1.03±0.13±0.21 keV. © 1990 The American Physical Society.

Published
1990

9. Measurement of the two-photon width of the η′(958)

Author

Butler, F, Boyer, J, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Riles, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Yelton, JM, and Schaad, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Using 203 pb-1 of data collected by the Mark II detector at the SLAC storage ring PEP, we have measured the radiative width of the for quasireal photons. The width is separately measured in the three reactions e+e-e+e-0+-,0; e+e-e+e-0+-; 0+-(0,), and e+e-e+e-0, giving a statistically weighted average two-photon width of=4.57±0.25±0.44 keV. As a byproduct of the study of the decay mode, we also measured the two-photon decay width of the a2(1320) as a2(1320)=1.03±0.13±0.21 keV. © 1990 The American Physical Society.

Published
1990

10. Search for a nearly degenerate lepton doublet (L-,L0).

Author

Riles, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in e+e- annihilation data taken with the Mark II detector at a center-of-mass energy of 29 GeV. In order to suppress contamination from conventional two-photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring the presence of an isolated, energetic photon allows a search for lepton doublets with mass splittings smaller than that previously accessible to experiment. No evidence for such a new lepton doublet has been found, enabling limits to be placed on allowed mass combinations. Mass splittings as low as 250-400 MeV/c2 are excluded for charged-lepton masses between 500 MeV/c2 and 10 GeV/c2. © 1990 The American Physical Society.

Published
1990

11. Search for decays of the Z to unstable neutral leptons with mass between 2.5 and 22 GeV

Author

Burchat, PR, King, M, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gatto, C, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, Klein, SR, Koetke, DS, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, Porter, FC, and Rankin, P

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Using the sample of neutral vector bosons (Z's) produced at the SLAC Linear Collider and detected with the Mark II detector, we search for the decay of the Z to a pair of particles, one of which decays to two charged particles. The observed number of Z decays with this signature excludes, at a confidence level greater than 95%, the decay of the Z to a pair of fourth-generation Dirac neutrinos with mass between 2.5 and 22 GeV, a decay length less than about 1 cm, and coupling to any of the first three generations of charged leptons. This is the first time the existence of such a lepton coupling to the ± has been excluded by a direct search. © 1990 The American Physical Society.

Published
1990

12. A reanalysis of B0-B̄0 mixing in e+e- annihilation at 29 GeV

Author

Weir, AJ, Abrams, G, Adolphsen, CE, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, I, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylef, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, Schaad, T, and Schalk, TL

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Data taken by the Mark II detector at the PEP storage ring was used to measure the rate of dilepton production in multihadronic events produced by e+e- annihilation at √s=29 GeV. We determine the probability that a hadron initially containing a b (b̄) quark decays to a positive (negative) lepton to be 0.17-0.08+0.15, with 90% confidence level limits of 0.06 and 0.38. © 1990.

Published
1990

13. Radiative tau production and decay.

Author

Wu, DY, Hayes, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Riles, K, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have studied the muon decay channel of the lepton with the presence of a photon in e+e- annihilation data at Ec.m.=29 GeV from the Mark II detector. Included in this study is the first direct measurement of radiative decay. We find the ratio of the measured branching fraction to the expected value from QED to be 1.03±0.42. © 1990 The American Physical Society.

Published
1990

14. Radiative τ production and decay

Author

Wu, DY, Hayes, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Riles, K, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Schaad, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have studied the muon decay channel of the lepton with the presence of a photon in e+e- annihilation data at Ec.m.=29 GeV from the Mark II detector. Included in this study is the first direct measurement of radiative decay. We find the ratio of the measured branching fraction to the expected value from QED to be 1.03±0.42. © 1990 The American Physical Society.

Published
1990

15. Upper limits on D± and B± decays to two leptons plus π± or K±

Author

Weir, AJ, Klein, SR, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Data taken by the Mark II detector at the SLAC e+e- storage ring PEP was used to search for exclusive decays of D and B mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5×10-3 to 9.2×10-3, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models. © 1990 The American Physical Society.

Published
1990

16. Challenges in semileptonic B decays

Author

Gambino, P., Kronfeld, A. S., Rotondo, M., Schwanda, C., Bernlochner, F., Bharucha, A., Bozzi, C., Calvi, M., Cao, L., Ciezarek, G., Davies, C. T. H., El-Khadra, A. X., Hashimoto, S., Jung, M., Khodjamirian, A., Ligeti, Z., Lunghi, E., Lüth, V., Mannel, T., Meinel, S., Paz, G., Schacht, S., Simula, S., Sutcliffe, W., Vaquero Avilés-Casco, A., Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Gambino, P, Kronfeld, A, Rotondo, M, Schwanda, C, Bernlochner, F, Bharucha, A, Bozzi, C, Calvi, M, Cao, L, Ciezarek, G, Davies, C, El-Khadra, A, Hashimoto, S, Jung, M, Khodjamirian, A, Ligeti, Z, Lunghi, E, Luth, V, Mannel, T, Meinel, S, Paz, G, Schacht, S, Simula, S, Sutcliffe, W, and Aviles-Casco, A

Subjects
lepton, B hadrons, Semileptonic decays, FOS: Physical sciences, hep-lat, BELLE, Atomic, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), Particle and Plasma Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear, Particle Physics - Phenomenology, form factor, Quantum Physics, hep-ex, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], High Energy Physics - Lattice (hep-lat), Molecular, B: decay, Particle Physics - Lattice, hep-ph, Nuclear & Particles Physics, LHC-B, quark: mass, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], BaBar, quantum chromodynamics: lattice, Particle Physics - Experiment
Abstract

Two of the elements of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, $|V_{ub}|$ and $|V_{cb}|$, are extracted from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, remain puzzling, because for both $|V_{ub}|$ and $|V_{cb}|$ the exclusive and inclusive determinations are in clear tension. Further, measurements in the $\tau$ channels at Belle, Babar, and LHCb show discrepancies with the Standard Model predictions, pointing to a possible violation of lepton flavor universality. LHCb and Belle II have the potential to resolve these issues in the next few years. This article summarizes the discussions and results obtained at the MITP workshop held on April 9--13, 2018, in Mainz, Germany, with the goal to develop a medium-term strategy of analyses and calculations aimed at solving the puzzles. Lattice and continuum theorists working together with experimentalists have discussed how to reshape the semileptonic analyses in view of the much higher luminosity expected at Belle II, searching for ways to systematically validate the theoretical predictions in both exclusive and inclusive B decays, and to exploit the rich possibilities at LHCb., Comment: 77 pages

Published
2020
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17. Measurement of the tau lifetime

Author

Amidei, D, Trilling, GH, Abrams, GS, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MK, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, de la Vaissiere, C, Wood, DR, Jaros, JA, Barklow, T, Boyarski, AM, Burchat, P, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Yelton, JM, and Schaad, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have used a high-resolution drift chamber in the Mark II detector at the SLAC storage ring PEP to measure the lifetime of leptons produced in e+e- annihilations at 29 GeV. Based on the flight-path distribution of 807 three-prong decays, the lifetime is found to be (2.880.16 0.17)×10-13 sec, in agreement with expectations for e - universality. © 1988 The American Physical Society.

Published
1988

18. Pion pair production in photon-photon collisions at spear

Author

Roussarie, A, Burke, DL, Abrams, GS, Alam, MS, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Goldhaber, G, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, Levi, M, Lüth, V, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Perl, ML, Richter, B, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Strait, J, Taureg, H, Tonutti, M, Trilling, GH, Vella, EN, Vidal, RA, Videau, I, Weiss, JM, and Zaccone, H

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We report a measurement of the cross section for the process γγ→π+π- at invariant masses 500 MeV/c2 < mππ

Published
1981

19. Decays of the ψ(3097) to baryon-antibaryon final states

Author

Eaton, MW, Goldhaber, G, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Gidal, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, E, Videau, I, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

A high-statistics study of decays into baryon final states has been done with the Mark II detector at SPEAR. A detailed test of baryon-antibaryon decay modes is presented. Substantial resonance formation is observed in multibody decays of the involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay pp. The flavor-SU(3)-forbidden decays (1385)+charge conjugate are observed with substantial branching ratios. © 1984 The American Physical Society.

Published
1984

20. Direct photon production at the ψ

Author

Scharre, DL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We present results of a detailed analysis of inclusive direct photon production at the (3095). The direct-photon momentum distribution for x>0.4 is presented and compared with the leading-order quantum-chromodynamic prediction. The total production rate is found to be consistent with theoretical expectations, but the observed momentum distribution is considerably softer. Results of an analysis of some inclusive properties of the hadronic system recoiling against the direct photon are presented. The mean charged-particle and Ks multiplicities are presented as functions of the invariant mass of the hadronic system. These data agree well with the corresponding mean multiplicities measured in e+e- annihilations at center-of-mass energies comparable to the invariant mass of the hadronic system. © 1981 The American Physical Society.

Published
1981

21. Measurement of the parameters of the ψ(3770) resonance

Author

Schindler, RH, Siegrist, JL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Scharre, DL, Schwitters, RF, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We present a measurement of the cross section for hadron production by e+e- annihilation in the vicinity of the previously observed resonance near 3.77 GeV. The data are used to determine the parameters of the (3770) resonance. The values found are: mass, 3764±5 MeV/c2, total width, 23.5±5 MeV, and partial width to electron pairs, 276±50 eV. © 1980 The American Physical Society.

Published
1980

22. Limit on the decay D0→eμ∓

Author

Riles, K, Dorfan, JM, Abrams, GS, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Himel, T, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, and Yelton, JM

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have searched for the lepton-flavor-violating decay D0e in 204 pb-1 of e+e- annihilation data at Ec.m.=29 GeV from the Mark II detector. No candidates were found; we estimate an upper limit on the cross section times branching ratio of (e+e-D0,D0; inclusive)B(D0e)

Published
1987

23. Pion pair production from γγ collisions at the SLAC e+e- storage ring PEP

Author

Smith, JR, Burke, DL, Boyarski, AM, Breidenbach, M, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Lockyer, N, Lüth, V, Matteuzzi, C, Perl, ML, Richter, B, Schlatter, D, Weiss, J, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Chinowsky, W, Dieterle, WE, Dillon, JB, Eaton, MW, Franklin, MEB, Gidal, G, Gold, MS, Goldhaber, G, Golding, LJ, Johnson, AD, Kadyk, JA, Nelson, ME, Patrick, JF, Rowson, PC, Schellman, HM, Sheldon, PD, Strait, J, de la Vaissière, C, Blocker, CA, Levi, M, Schaad, T, and Schwitters, RF

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have studied several features of the production of charged-hardon pairs by γγ collisions. We have measured the f0 partial width Γf0→γγ(Q2) for Q2 in the range 0

Published
1984

24. Search for B-decay to Higgs bosons for Higgs boson masses between 50 and 210 MeV/c2

Author

Snyder, A, Murray, WN, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidel, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We use data from the Mark II experiment at PEP to search for the process B→h0X for mh0 between 50 and 210 MeV/c2. No evidence for the Higgs boson is seen in this mass range. The limit obtained rules out the standard Higgs boson for masses between 70 and 210 MeV/c2 and significantly constrains extensions of the Higgs sector. © 1989.

Published
1989

25. Measurement of the D0 and D+ lifetimes.

Author

Gladney, L, Jaros, JA, Ong, RA, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, P, Burke, DL, Dorfan, JM, Feldman, GJ, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Perl, ML, Richter, B, Riles, K, Ross, MC, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MK, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere C, Wood, DR, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We have used a high-resolution drift chamber in the Mark II detector at the SLAC e+e- storage ring PEP to measure the lifetimes of the D0 and D+ mesons produced in e+e- annihilations at 29 GeV. Based on a sample of 74 decays for the D0 mesons and 23 decays for the D+ mesons, the lifetimes are found to be &=(4.7-0.8+0.9) 0.5×10-13 sec and &=(8.9-2.7+3.8) 1.3×10-13 sec. This leads to a ratio of lifetimes &=1.9-0.7 0.3+0.9.. AE © 1986 The American Physical Society.

Published
1986

26. Bose-Einstein correlations in e+e- collisions.

Author

Juricic, I, Goldhaber, G, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Carithers, WC, Gold, MS, Golding, L, Haggerty, J, Herrup, D, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Barklow, T, Boyarski, A, Breidenbach, M, Burchat, P, Burke, DL, Cords, D, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schindler, RH, Yelton, JM, Schaad, T, and Schwitters, RF

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Four data sets collected with the Mark II detector during its operation at the SPEAR and PEP e+e- storage rings at SLAC are used to study the Bose-Einstein correlation between pairs and triplets of like-sign charged pions. The data sets represent four different regions of energy available for hadron production: the J at s =3.095 GeV, typical hadronic energy of 5 GeV in two-photon events, and annihilation in the energy regions s =47 GeV above the J, and s =29 GeV. The Bose-Einstein correlation is studied as a function of Q2, the four-momentum difference squared of the pair, and of Q32, an analogous quantity defined for triplets. After corrections for Coulomb effects and pion misidentification, pair analyses indicate a nearly full Bose-Einstein enhancement (1) in the J and the two-photon data, and about half the maximum value in the two higher-energy data sets. The pair analysis parameter r lies within a band of ±0.1 fm around 0.7 fm and is essentially the same for all four data sets. Pion triplet analyses give consistent results for the triplet parameters 3 and r3. In an attempt to investigate the shape of the pion source, we also study the Bose-Einstein correlation in pion pairs using two-dimensional distributions in components of Q2. © 1989 The American Physical Society.

Published
1989

27. Improved upper limit on nu tau mass.

Author

Matteuzzi, C, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, P, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Abrams, GS, de la Vaissiere C, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, D, Levi, M, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We update our previous analysis of the 3±01/2 decay mode by the addition of new data to obtain an improved upper limit on the 1/2 mass of 143 MeV/c2 at the 95% confidence level. © 1985 The American Physical Society.

Published
1985

28. Searches for unstable neutral leptons in low-multiplicity events from electron-positron annihilation.

Author

Perl, ML, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, de la Vaissiere C, Wood, DR, Levi, ME, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Upper limits are given on the production of unstable neutral leptons in electron-positron annihilation at 29 GeV. The searches use selected two- and four-charged-particle events and are most sensitive to neutral-lepton masses of the order of 1 GeV/c2 and smaller. However, results are given for masses up to 14 GeV/c2. © 1985 The American Physical Society.

Published
1985

29. Measurement of the branching fractions of the tau lepton using a tagged sample of tau decays.

Author

Burchat, PR, Feldman, GJ, Barklow, T, Boyarski, AM, Burke, DL, Dorfan, JM, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere C, Wood, DR, Levi, ME, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The branching fractions for the major decay modes of the lepton are measured from a sample of tagged decays selected from +- pairs produced in e+e- annihilation. The decay products of one member of the +- pair are used to identify the event. The opposite member of the pair is then included in the sample if it satisfies an invariant-mass cut and a charged-multiplicity cut. In this way, we attempt to select an unbiased sample of decays. The sample is divided into categories based on charged- and neutral-particle multiplicities, and charged-particle identification. The branching fractions are measured simultaneously, with an unfold technique and a maximum-likelihood fit, with the sum of the branching fractions constrained to be unity. The branching fractions for the decay modes - K- and - K*- are fixed at the world averages in the fit. The following branching fractions are measured: B(-e) =(19.10.81.1)%, B(-' - )=(18.30.90.8)%, B(-) =(10.01.1 *1,4)%, B(-0) =(25.81.72.5)%, B(-(n0, n>1))=(12.01.42.5)%, B(-+-) =(6.7 0.80.9)%, and B(-+- (n0,n>0)) =(6.10.80.9)%. The total branching fraction to one charged pion plus at least one neutral hadron is measured to be (37.81.21.0)%. Limits on allowed decay modes involving the meson are discussed. © 1987 The American Physical Society.

Published
1987

30. Measurement of K* and K0 inclusive rates in e+e- annihilation at 29 GeV.

Author

Schellman, H, Trilling, GH, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Dillon, JB, Gidal, G, Gold, MS, Goldhaber, G, Golding, LJ, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schmidke, WB, Sheldon, PD, de la Vaissiere C, Wood, DR, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Himel, T, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Levi, ME, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We have measured the K0+K0 inclusive cross section in e+e- annihilation at 29 GeV with the Mark II detector SLAC PEP. We find 1.270.030.15 K0+K0 per hadronic event. We have also used time-of-flight particle identification to measure the K rate over the momentum range 300900 MeV/c. © 1985 The American Physical Society.

Published
1985

31. Study of noncollinear two-charged-particle events produced in 29-GeV electron-positron annihilation.

Author

Perl, ML, Müller, L, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MK, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, de la Vaissiere C, Wood, DR, Levi, ME, and Schaad, T

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

This paper presents a study of events produced in 29-GeV electron-positron annihilation in which there are just two noncollinear charged particles, no detected photons, and two or more undetected particles. These events can be explained by attributing them primarily to the reactions e+e-'e+e-e+e- and e+e-'e+e-+- where just two particles appear in the Mark II detector. There is no evidence for unconventional sources for such events. © 1986 The American Physical Society.

Published
1986

32. Variation of the strong coupling constant from a measurement of the jet energy spread in e+e− annihilation

Author

Löhr, B, Hollebeek, RJ, Richter, B, Schlatter, D, Abrams, GS, Amidei, D, Blocker, CA, Boyarski, AM, Breidenbach, M, Burke, DL, Dieterle, WE, Dillon, JB, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Hanson, G, Innes, WR, Jaros, JA, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Levi, M, Lockyer, N, Lüth, V, Matteuzzi, C, Nelson, ME, Patrick, JF, Perl, ML, Rowson, PC, Schaad, T, Schellman, H, Schwitters, RF, Sheldon, PD, Strait, J, de la Vaissiere, C, Yelton, JM, and Zaiser, C

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

A measurement of jet energy spread in the reaction e+e- → hadrons is presented. Using a jet calculus model for the jet development we determine the variation of the strong coupling constant with respect to momentum transfer. The observed variation is consistent with that expected for QCD over a wide range of momentum transfers. This method alone is not sufficient to distinguish QCD from simple limited transverse momentum models. © 1983.

Published
1983

33. Determination of αs from energy-energy correlations in e+e- annihilation at 29 GeV

Author

Wood, DR, Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Lüth, V, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Porter, FC, and Rankin, P

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Affordable and Clean Energy, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988

34. Experimental upper limits on branching fractions for unexpected decay modes of the τ lepton

Author

Hayes, KG, Perl, ML, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Blondel, A, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Searches for 12 neutrinoless decay modes of the which violate lepton-number conservation have been made using the reaction e+e-+-. No evidence for lepton-number violation is observed, and we have set upper limits (90% C.L.) on the branching ratio for each decay mode. The branching-ratio limits on the radiative decays and e are 0.055 and 0.064%, respectively. For the charged lepton decays ee, eee, and, the branching ratio limits are 0.040, 0.033, 0.044, and 0.049%, respectively. Upper limits on the branching ratios for the following charged lepton + neutral hadron decays are 0 (0.037%), 0 (0.044%), eK0 (0.13%), K0 (0.10%), 0 (0.21%), and 0 (0.082%). We also use these data to search for the pair production in e+e- annihilation of some unconventional particles with masses less than about 3 GeV/c2. © 1982 The American Physical Society.

Published
1982

35. A measurement of the cross section for four-pion production in λλ collisions at spear

Author

Burke, DL, Abrams, GS, Alam, MS, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Goldhaber, G, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, Levi, M, Lüth, V, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Strait, J, Taureg, H, Tonutti, M, Trilling, GH, Vella, EN, Vidal, RA, Videau, I, Weiss, JM, and Zaccone, H

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We present a measurement of the cross section for the reaction e+e- → e+e-π+π-π+π-at SPEAR. This channel is found to be large and dominated by the process γγ → ρ{variant}0ρ{variant}0 → π+π-π+π-. The cross section, which is small just above the four-pion threshold, exhibits a large enhancement near the ρ{variant}0ρ{variant}0 threshold. © 1981.

Published
1981

36. Improved upper limit on ντ mass

Author

Matteuzzi, C, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, P, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Abrams, GS, de la Vaissiere, C, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, D, Levi, M, and Schaad, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We update our previous analysis of the 3±01/2 decay mode by the addition of new data to obtain an improved upper limit on the 1/2 mass of 143 MeV/c2 at the 95% confidence level. © 1985 The American Physical Society.

Published
1985

37. Limits on Jψ and ϒ production in e+e− interactions at s = 29 GeV

Author

Matteuzzi, C, Abrams, GS, Amidei, D, Blocker, CA, Boyarski, AM, Breidenbach, M, Burke, DL, Chinowsky, W, Dieterle, WE, Dillon, JB, Dorfan, JM, Eaton, MW, Feldman, GJ, Granklin, MEB, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Levi, M, Lockyer, N, Lüth, V, Nelson, ME, Patrick, JF, Perl, ML, Richter, B, Rowson, PC, Schaad, T, Schellman, H, Schlatter, D, Schwitters, RF, Sheldon, PD, Strait, J, Trilling, GH, de la Vaissiere, C, Yelton, JM, and Zaiser, C

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

A search has been made for the inclusive production of J ψ (3.1) and Υ{hooked} (9.4) mesons in e+e- interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J ψ region, nor in the Υ{hooked} region. The limits on the cross sections are σ(e+e- → ψX) < 4.4 × 10-36cm2, and σ(e+e- → Υ{hooked}X) < 4.7 × 10-36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → ℓ+ℓ-X) < 0.8%. © 1983.

Published
1983

38. Measurement of single and double radiative low-Q2 Bhabha scattering at Ec.m.

Author

Karlen, D, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Yelton, JM

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

The process e+e-e+e-(), where one electron scatters at a small angle, is studied with data from the Mark II detector at the SLAC storage ring PEP. The data are in excellent agreement with a Monte Carlo calculation and include a large contribution from order 4. The ratio of measured to calculated cross sections is R=0.9930.0170.015, where the first error is statistical and the second systematic. This is a sensitive test of the calculation of the dominant background for neutrino-counting experiments. © 1989 The American Physical Society.

Published
1989

39. Limits on new-lepton pairs (L-,L0) with arbitrary neutrino mass.

Author

Stoker, DP, Perl, ML, Abrams, G, Baden, AR, Barklow, T, Barnett, BA, Boyarski, AM, Boyer, J, Burchat, PR, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Hanson, G, Harral, BD, Hayes, K, Herrup, D, Hylen, JE, Innes, WR, Jaros, JA, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, LeClaire, BW, Levi, M, Lüth, V, Matthews, JA, Ong, RA, Riles, K, Rowson, PC, and Wood, DR

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have searched 205 pb-1 of s =29 GeV data from the Mark II detector at the SLAC e+e- storage ring PEP for events which may signify the existence of a new lepton pair (L-,L0) where the L0 may be massive, but does not exceed the L- mass. Three event signatures for L+L- decay are examined: (i) e, (ii) (e or)(+4), and (iii) (e or )(3+0). The numbers of signature events are found to be in good agreement with Monte Carlo simulations of known background sources. The ranges of L- and L0 masses for which new lepton pairs are excluded are obtained using a likelihood-ratio method to compare the number of observed signature events to the expected background, and to the expected background plus Monte Carlo predictions of (L-,L0) signals. © 1989 The American Physical Society.

Published
1989

40. Upper limit on B0B0 mixing in e+e- annihilation at 29 GeV

Author

Schaad, T, Nelson, ME, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schellman, H, Schmidke, WB, Schwitters, R, Sheldon, PD, trilling, GH, De La Vaissiere, C, Wood, DR, Yelton, JM, and Zaiser, C

Subjects
Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Published
1985

41. Upper limit on the branching ratio for the decay τ-→Π-ηvτ

Author

Gan, KK, Abrams, GS, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, and Yelton, JM

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We have searched for the decay τ-→Π-ηvτ using the MARK II detector at the PEP e+e- storage ring. No evidence for the decay is found; the upper limit for the branching ratio is B(τ-→Π-ηvτ)

Published
1987

42. Observation of ψ production in e+e- annihilation at 29 GeV

Author

Wormser, G, Ong, RA, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, and Yelton, JM

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Inclusive production in e+e- annihilation at 29 GeV has been measured with the Mark II detector. The cross section is found to be 1.10.50.4 pb. After subtraction of the expected contribution from B decay, an upper limit of 0.02 is obtained for other sources of production. © 1988 The American Physical Society.

Published
1988

43. Measurement of the branching fractions of the τ lepton using a tagged sample of τ decays

Author

Burchat, PR, Feldman, GJ, Barklow, T, Boyarski, AM, Burke, DL, Dorfan, JM, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, Levi, ME, and Schaad, T

Subjects
Emerging Infectious Diseases, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

The branching fractions for the major decay modes of the lepton are measured from a sample of tagged decays selected from +- pairs produced in e+e- annihilation. The decay products of one member of the +- pair are used to identify the event. The opposite member of the pair is then included in the sample if it satisfies an invariant-mass cut and a charged-multiplicity cut. In this way, we attempt to select an unbiased sample of decays. The sample is divided into categories based on charged- and neutral-particle multiplicities, and charged-particle identification. The branching fractions are measured simultaneously, with an unfold technique and a maximum-likelihood fit, with the sum of the branching fractions constrained to be unity. The branching fractions for the decay modes - K- and - K*- are fixed at the world averages in the fit. The following branching fractions are measured: B(-e) =(19.10.81.1)%, B(-' - )=(18.30.90.8)%, B(-) =(10.01.1 *1,4)%, B(-0) =(25.81.72.5)%, B(-(n0, n>1))=(12.01.42.5)%, B(-+-) =(6.7 0.80.9)%, and B(-+- (n0,n>0)) =(6.10.80.9)%. The total branching fraction to one charged pion plus at least one neutral hadron is measured to be (37.81.21.0)%. Limits on allowed decay modes involving the meson are discussed. © 1987 The American Physical Society.

Published
1987

44. Observation of psi production in e+e- annihilation at 29 GeV.

Author

Wormser, G, Ong, RA, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Innes, WR, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere C, Wood, DR, and Yelton, JM

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Inclusive production in e+e- annihilation at 29 GeV has been measured with the Mark II detector. The cross section is found to be 1.10.50.4 pb. After subtraction of the expected contribution from B decay, an upper limit of 0.02 is obtained for other sources of production. © 1988 The American Physical Society.

Published
1988

45. Limits on J ψ and ϒproduction in e + e - interactions at s = 29 GeV

Author

Matteuzzi, C, Abrams, GS, Amidei, D, Blocker, CA, Boyarski, AM, Breidenbach, M, Burke, DL, Chinowsky, W, Dieterle, WE, Dillon, JB, Dorfan, JM, Eaton, MW, Feldman, GJ, Granklin, MEB, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Levi, M, Lockyer, N, Lüth, V, Nelson, ME, Patrick, JF, Perl, ML, Richter, B, Rowson, PC, Schaad, T, Schellman, H, Schlatter, D, Schwitters, RF, Sheldon, PD, Strait, J, Trilling, GH, de la Vaissiere, C, Yelton, JM, and Zaiser, C

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

A search has been made for the inclusive production of J ψ (3.1) and Υ{hooked} (9.4) mesons in e+e- interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J ψ region, nor in the Υ{hooked} region. The limits on the cross sections are σ(e+e- → ψX) < 4.4 × 10-36cm2, and σ(e+e- → Υ{hooked}X) < 4.7 × 10-36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → ℓ+ℓ-X) < 0.8%. © 1983.

Published
1983

46. Decays of the (3097) to baryon-antibaryon final states

Author

Eaton, MW, Goldhaber, G, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Gidal, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, E, Videau, I, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

A high-statistics study of decays into baryon final states has been done with the Mark II detector at SPEAR. A detailed test of baryon-antibaryon decay modes is presented. Substantial resonance formation is observed in multibody decays of the involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay pp. The flavor-SU(3)-forbidden decays (1385)+charge conjugate are observed with substantial branching ratios. © 1984 The American Physical Society.

Published
1984

47. Studies of jet production rates in e+e- annihilation at Ecm=29 GeV

Author

Bethke, S, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bullos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, F, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Komamiya, S, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, Schalk, TL, Schmidke, WB, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, and Soderstrom, E

Subjects
Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Production rates of multijet hadronic final states are studied in e+e- annihilation at 29 GeV center of mass energy. QCD shower model calculations with exact first order matrix element weighting at the first gluon vertex are capable of reproducing the observed multijet event rates over a large range of jet pair masses. The method used to reconstruct jets is well suited for directly comparing experimental jet rates with parton rates calculated in perturbative QCD. Evidence for the energy dependene of αs is obtained by comparing the observed production rates of 3-jet events with results of similar studies performed at higher center of mass energies. © 1989 Springer-Verlag.

Published
1989

48. Observation of the radiative transition ψ → γE(1420)

Author

Scharre, DL, Trilling, GH, Abrams, GS, Alam, MS, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Goldhaber, G, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, Lüth, V, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Perl, ML, Richter, B, Roussarie, A, Schindler, RH, Schwitters, RF, Siegrist, JL, Strait, J, Taureg, H, Tonutti, M, Vella, EN, Vidal, RA, Videau, I, Weiss, JM, and Zaccone, H

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We have observed a radiative transition from the ψ to a state decaying into KSK±π∓, with mass M = 1.44-0.015+0.01 GeV/c2 and width Γ = 0.05-0.02+0.03 GeV/c2. We tentatively identify this state as the E(1420). Assuming that this state is an isospin singlet, we have determined the branching fraction product B(ψ → γE) × B(E × KKπ) = (3.6 ± 1.4) × 10-3. © 1980.

Published
1980

49. A study of the decay τ-→π-μτ

Author

Blocker, CA, Dorfan, JM, Abrams, GS, Alam, MS, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Goldhaber, G, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, Levi, M, Lüth, V, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Strait, J, Taureg, H, Tonutti, M, Trilling, GH, Vella, EN, Vidal, RA, Videau, I, Weiss, JM, and Zaccone, H

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We present a high statistics measurement of the branching ratio for the decay τ-→π-μτ using data obtained with the Mark II detector at the SLAC e+e- storage ring SPEAR. We have used events from the center-of-mass energy region 3.52 to 6.7 GeV to determine that B(τ-→π-μτ)=0.117±0.004±0.018. From electron-muon events in the same data sample, we have determined that B(τ-→π-μτ) B(τ-→e--μeμτ)=0.66±0.03±0.11. We present measurements of the mass and spin of the τ and the mass of the τ neutrino based, for the first time, on a hadronic decay mode of the τ. © 1982.

Published
1982

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