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1. Direct measurements of ab and ac using vertex and kaon charge tags at the SLAC detector

Author

Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, KG, Baltay, C, Band, HR, Barklow, TL, Bauer, JM, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Calcaterra, A, Cassell, R, Chou, A, Cohn, HO, Coller, JA, Convery, MR, Cook, V, Cowan, RF, Crawford, G, Damerell, CJ, Daoudi, M, Dasu, S, de Groot, N, de Sangro, R, Dong, DN, Doser, M, Dubois, R, Erofeeva, I, Eschenburg, V, Etzion, E, Fahey, S, Falciai, D, Fernandez, JP, Flood, K, Frey, R, Hart, EL, Hasuko, K, Hertzbach, SS, Huffer, ME, Huynh, X, Iwasaki, M, Jackson, DJ, Jacques, P, Jaros, JA, Jiang, ZY, Johnson, AS, Johnson, JR, Kajikawa, R, Kalelkar, M, Kang, HJ, Kofler, RR, Kroeger, RS, Langston, M, Leith, DW, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, McKemey, AK, Messner, R, Moffeit, KC, Moore, TB, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Neal, H, Nesom, G, Oishi, N, Onoprienko, D, Osborne, LS, Panvini, RS, Park, CH, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, RJ, Prepost, R, Prescott, CY, Ratcliff, BN, Reidy, J, Reinertsen, PL, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schumm, BA, Schwiening, J, Serbo, VV, Shapiro, G, Sinev, NB, Snyder, JA, Staengle, H, Stahl, A, Stamer, P, Steiner, H, Su, D, Suekane, F, Sugiyama, A, Suzuki, A, Swartz, M, Taylor, FE, Thom, J, Torrence, E, Usher, T, Va'vra, J, Verdier, R, Wagner, DL, Waite, AP, Walston, S, Weidemann, AW, Weiss, ER, Whitaker, JS, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Wittlin, JL, Woods, M, Wright, TR, Yamamoto, RK, Yashima, J, Yellin, SJ, Young, CC, and Yuta, H

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

Exploiting the manipulation of the SLAC Linear Collider electron-beam polarization, we present precise direct measurements of the parity-violation parameters Ac and Ab in the Z-boson-c-quark and Z-boson-b-quark coupling. Quark-antiquark discrimination is accomplished via a unique algorithm that takes advantage of the precise SLAC Large Detector charge coupled device vertex detector, employing the net charge of displaced vertices as well as the charge of kaons that emanate from those vertices. From the 1996-1998 sample of 400000 Z decays, produced with an average beam polarization of 73.4%, we find Ac = 0.673 ± 0.029(stat) ± 0.023(syst) and Ab = 0.919 ± 0.018(stat) ± 0.017(syst). © 2005 The American Physical Society.

Published
2005

2. Improved direct measurement of A(b) and A(c) at the Z(0) pole using a lepton tag

Author

Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, KG, Baltay, C, Band, HR, Barklow, TL, Bauer, JM, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Calcaterra, A, Cassell, R, Chou, A, Cohn, HO, Coller, JA, Convery, MR, Cook, V, Cowan, RF, Crawford, G, Damerell, CJS, Daoudi, M, de Groot, N, de Sangro, R, Dong, DN, Doser, M, Dubois, R, Erofeeva, I, Eschenburg, V, Fahey, S, Falciai, D, Fernandez, JP, Flood, K, Frey, R, Hart, EL, Hasuko, K, Hertzbach, SS, Huffer, ME, Huynh, X, Iwasaki, M, Jackson, DJ, Jacques, P, Jaros, JA, Jiang, ZY, Johnson, AS, Johnson, JR, Kajikawa, R, Kalelkar, M, Kang, HJ, Kofler, RR, Kroeger, RS, Langston, M, Leith, DWG, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, McKemey, AK, Messner, R, Moffeit, KC, Moore, TB, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Neal, H, Nesom, G, Oishi, N, Onoprienko, D, Osborne, LS, Panvini, RS, Park, CH, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, RJ, Prepost, R, Prescott, CY, Ratcliff, BN, Reidy, J, Reinertsen, PL, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schumm, BA, Schwiening, J, Serbo, VV, Shapiro, G, Sinev, NB, Snyder, JA, Staengle, H, Stahl, A, Stamer, P, Steiner, H, Su, D, Suekane, F, Sugiyama, A, Suzuki, S, Swartz, M, Taylor, FE, Thom, J, Torrence, E, Usher, T, Va'vra, J, Verdier, R, Wagner, DL, Waite, AP, Walston, S, Weidemann, AW, Weiss, ER, Whitaker, JS, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Wittlin, JL, Woods, M, Wright, TR, Yamamoto, RK, Yashima, J, Yellin, SJ, Young, CC, Yuta, H, and Collaboration, SLD

Published
2002

3. First symmetry tests in polarized Z0 decays to bb̄g

Author

Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, KG, Baltay, C, Band, HR, Barklow, TL, Bauer, JM, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Calcaterra, A, Cassell, R, Chou, A, Cohn, HO, Coller, JA, Convery, MR, Cook, V, Cowan, RF, Crawford, G, Damerell, CJ, Daoudi, M, de Groot, N, de Sangro, R, Dong, DN, Doser, M, Dubois, R, Erofeeva, I, Eschenburg, V, Etzion, E, Fahey, S, Falciai, D, Fernandez, JP, Flood, K, Frey, R, Hart, EL, Hasuko, K, Hertzbach, SS, Huffer, ME, Huynh, X, Iwasaki, M, Jackson, DJ, Jacques, P, Jaros, JA, Jiang, ZY, Johnson, AS, Johnson, JR, Kajikawa, R, Kalelkar, M, Kang, HJ, Kofler, RR, Kroeger, RS, Langston, M, Leith, DW, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, McKemey, AK, Messner, R, Moffeit, KC, Moore, TB, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Neal, H, Nesom, G, Oishi, N, Onoprienko, D, Osborne, LS, Panvini, RS, Park, CH, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, RJ, Prepost, R, Prescott, CY, Ratcliff, BN, Reidy, J, Reinertsen, PL, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schumm, BA, Schwiening, J, Serbo, VV, Shapiro, G, Sinev, NB, Snyder, JA, Staengle, H, Stahl, A, Stamer, P, Steiner, H, Su, D, Suekane, F, Sugiyama, A, Suzuki, A, Swartz, M, Taylor, FE, Thom, J, Torrence, E, Usher, T, Va'vra, J, Verdier, R, Wagner, DL, Waite, AP, Walston, S, Weidemann, AW, Weiss, ER, Whitaker, JS, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Wittlin, JL, Woods, M, Wright, TR, Yamamoto, RK, Yashima, J, Yellin, SJ, Young, CC, and Yuta, H

Subjects
High Energy Physics::Experiment
Abstract

We have made the first direct symmetry tests in the decays of polarized Z0 bosons into fully identified bbg states, collected in the SLD experiment at SLAC. We searched for evidence of parity violation at the bbg vertex by studying the asymmetries in the b-quark polar- and azimuthal-angle distributions, and for evidence of T-odd, CP-even or CP-odd, final-state interactions by measuring angular correlations between the three-jet plane and the Z0 polarization. We found results consistent with standard model expectations and set 95% C. limits on anomalous contributions.

Published
2001

4. First direct measurement of the parity-violating coupling of the Z(0) to the s quark

Author

Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, KG, Baltay, C, Band, HR, Barklow, TL, Bauer, JM, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Calcaterra, A, Cassell, R, Chou, A, Cohn, HO, Coller, JA, Convery, MR, Cook, V, Cowan, RF, Crawford, G, Damerell, CJS, Daoudi, M, de Groot, N, de Sangro, R, Dong, DN, Doser, M, Dubois, R, Erofeeva, I, Eschenburg, V, Etzion, E, Fahey, S, Falciai, D, Fernandez, JP, Flood, K, Frey, R, Hart, EL, Hasuko, K, Hertzbach, SS, Huffer, ME, Huynh, X, Iwasaki, M, Jackson, DJ, Jacques, P, Jaros, JA, Jiang, ZY, Johnson, AS, Johnson, JR, Kajikawa, R, Kalelkar, M, Kang, HJ, Kofler, RR, Kroeger, RS, Langston, M, Leith, DWG, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, McKemey, AK, Messner, R, Moffeit, KC, Moore, TB, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Neal, H, Nesom, G, Oishi, N, Onoprienko, D, Osborne, LS, Panvini, RS, Park, CH, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, RJ, Prepost, R, Prescott, CY, Ratcliff, BN, Reidy, J, Reinertsen, PL, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schumm, BA, Schwiening, J, Serbo, VV, Shapiro, G, Sinev, NB, Snyder, JA, Staengle, H, Stahl, A, Stamer, P, Steiner, H, Su, D, Suekane, F, Sugiyama, A, Suzuki, A, Swartz, M, Taylor, FE, Thom, J, Torrence, E, Usher, T, Va'vra, J, Verdier, R, Wagner, DL, Waite, AP, Walston, S, Weidemann, AW, Weiss, ER, Whitaker, JS, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Wittlin, JL, Woods, M, Wright, TR, Yamamoto, RK, Yashima, J, Yellin, SJ, Young, CC, Yuta, H, and Collaboration, SLD

Published
2000

5. Precise measurement of the b-quark fragmentation function in Z0 boson decays

Author

Abe, K, Abe, T, Adam, I, Akimoto, H, Aston, D, Baird, KG, Baltay, C, Band, HR, Barklow, TL, Bauer, JM, Bellodi, G, Berger, R, Blaylock, G, Bogart, JR, Bower, GR, Brau, JE, Breidenbach, M, Bugg, WM, Burke, D, Burnett, TH, Burrows, PN, Calcaterra, A, Cassell, R, Chou, A, Cohn, HO, Coller, JA, Convery, MR, Cook, V, Cowan, RF, Crawford, G, Damerell, CJS, Daoudi, M, Dasu, S, de Groot, N, de Sangro, R, Dong, DN, Doser, M, Dubois, R, Erofeeva, I, Eschenberg, V, Etzion, E, Fahey, S, Falciai, D, Fernandez, JP, Flood, K, Frey, R, Hart, EL, Hasuko, K, Hertzbach, SS, Huffer, ME, Huynh, X, Iwasaki, M, Jackson, DJ, Jacques, P, Jaros, JA, Jiang, ZY, Johnson, AS, Johnson, JR, Kajikawa, R, Kalelkar, M, Kang, H, Kofler, RR, Kroeger, RS, Langston, M, Leith, DWG, Lia, V, Lin, C, Mancinelli, G, Manly, S, Mantovani, G, Markiewicz, TW, Maruyama, T, McKemey, AK, Messner, R, Moffeit, KC, Moore, TB, Morii, M, Muller, D, Murzin, V, Narita, S, Nauenberg, U, Nesom, G, Oishi, N, Onoprienko, D, Osborne, LS, Panvini, RS, Park, CH, Peruzzi, I, Piccolo, M, Piemontese, L, Plano, RJ, Prepost, R, Prescott, CY, Ratcliff, BN, Reidy, J, Reinertsen, PL, Rochester, LS, Rowson, PC, Russell, JJ, Saxton, OH, Schalk, T, Schumm, BA, Schwiening, J, Serbo, VV, Shapiro, G, Sinev, NB, Snyder, JA, Staengle, H, Stahl, A, Stamer, P, Steiner, H, Su, D, Suekane, F, Sugiyama, A, Swartz, M, Taylor, FE, Thom, J, Usher, T, Va'vra, J, Verdier, R, Wagner, DL, Waite, AP, Walston, S, Wang, J, Weidemann, AW, Weiss, ER, Whitaker, JS, Williams, SH, Willocq, S, Wilson, RJ, Wisniewski, WJ, Wittlin, JL, Woods, H, Wright, TR, Yamamoto, RK, Yashima, J, Yellin, SJ, Young, CC, and Yuta, H

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

We have developed a new technique for inclusive reconstruction of the energy of B hadrons. The excellent efficiency and resolution of this technique allow us to make the most precise determination of the b-quark fragmentation function, using e+e-→Z0 decays recorded in the SLAC Large Detector experiment. We compared our measurement with the predictions of a number of fragmentation models. We excluded several of these models and measured the average scaled energy of weakly decaying B hadrons to be (xB) = 0.714 ± 0.005(stat) ± 0.007(syst) ± 0.002 (model dependence). © 2000 The American Physical Society.

Published
2000

6. Hosing of a Long Relativistic Particle Bunch in Plasma.

Author

Nechaeva T, Verra L, Pucek J, Ranc L, Bergamaschi M, Zevi Della Porta G, Muggli P, Agnello R, Ahdida CC, Amoedo C, Andrebe Y, Apsimon O, Apsimon R, Arnesano JM, Bencini V, Blanchard P, Burrows PN, Buttenschön B, Caldwell A, Chung M, Cooke DA, Davut C, Demeter G, Dexter AC, Doebert S, Farmer J, Fasoli A, Fonseca R, Furno I, Granados E, Granetzny M, Graubner T, Grulke O, Gschwendtner E, Guran E, Henderson J, Kedves MÁ, Kim SY, Kraus F, Krupa M, Lefevre T, Liang L, Liu S, Lopes N, Lotov K, Martinez Calderon M, Mazzoni S, Moon K, Morales Guzmán PI, Moreira M, Okhotnikov N, Pakuza C, Pannell F, Pardons A, Pepitone K, Poimenidou E, Pukhov A, Rey S, Rossel R, Saberi H, Schmitz O, Senes E, Silva F, Silva L, Spear B, Stollberg C, Sublet A, Swain C, Topaloudis A, Torrado N, Turner M, Velotti F, Verzilov V, Vieira J, Welsch C, Wendt M, Wing M, Wolfenden J, Woolley B, Xia G, Yarygova V, and Zepp M

Abstract

Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven by a short, misaligned preceding bunch. Hosing develops in the plane of misalignment, self-modulation in the perpendicular plane, at frequencies close to the plasma electron frequency, and are reproducible. Development of hosing depends on misalignment direction, its growth on misalignment extent and on proton bunch charge. Results have the main characteristics of a theoretical model, are relevant to other plasma-based accelerators and represent the first characterization of hosing.

Published
2024
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7. Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma.

Author

Verra L, Zevi Della Porta G, Pucek J, Nechaeva T, Wyler S, Bergamaschi M, Senes E, Guran E, Moody JT, Kedves MÁ, Gschwendtner E, Muggli P, Agnello R, Ahdida CC, Goncalves MCA, Andrebe Y, Apsimon O, Apsimon R, Arnesano JM, Bachmann AM, Barrientos D, Batsch F, Bencini V, Blanchard P, Burrows PN, Buttenschön B, Caldwell A, Chappell J, Chevallay E, Chung M, Cooke DA, Davut C, Demeter G, Dexter AC, Doebert S, Elverson FA, Farmer J, Fasoli A, Fedosseev V, Fonseca R, Furno I, Gorn A, Granados E, Granetzny M, Graubner T, Grulke O, Hafych V, Henderson J, Hüther M, Khudiakov V, Kim SY, Kraus F, Krupa M, Lefevre T, Liang L, Liu S, Lopes N, Lotov K, Martinez Calderon M, Mazzoni S, Medina Godoy D, Moon K, Morales Guzmán PI, Moreira M, Nowak E, Pakuza C, Panuganti H, Pardons A, Pepitone K, Perera A, Pukhov A, Ramjiawan RL, Rey S, Schmitz O, Silva F, Silva L, Stollberg C, Sublet A, Swain C, Topaloudis A, Torrado N, Tuev P, Velotti F, Verzilov V, Vieira J, Weidl M, Welsch C, Wendt M, Wing M, Wolfenden J, Woolley B, Xia G, Yarygova V, and Zepp M

Abstract

A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton bunch can be seeded by the wakefields driven by a preceding electron bunch. SM timing reproducibility and control are at the level of a small fraction of the modulation period. With this seeding method, we independently control the amplitude of the seed wakefields with the charge of the electron bunch and the growth rate of SM with the charge of the proton bunch. Seeding leads to larger growth of the wakefields than in the instability case.

Published
2022
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8. Transition between Instability and Seeded Self-Modulation of a Relativistic Particle Bunch in Plasma.

Author

Batsch F, Muggli P, Agnello R, Ahdida CC, Amoedo Goncalves MC, Andrebe Y, Apsimon O, Apsimon R, Bachmann AM, Baistrukov MA, Blanchard P, Braunmüller F, Burrows PN, Buttenschön B, Caldwell A, Chappell J, Chevallay E, Chung M, Cooke DA, Damerau H, Davut C, Demeter G, Deubner HL, Doebert S, Farmer J, Fasoli A, Fedosseev VN, Fiorito R, Fonseca RA, Friebel F, Furno I, Garolfi L, Gessner S, Gorgisyan I, Gorn AA, Granados E, Granetzny M, Graubner T, Grulke O, Gschwendtner E, Hafych V, Helm A, Henderson JR, Hüther M, Kargapolov IY, Kim SY, Kraus F, Krupa M, Lefevre T, Liang L, Liu S, Lopes N, Lotov KV, Martyanov M, Mazzoni S, Medina Godoy D, Minakov VA, Moody JT, Moon K, Morales Guzmán PI, Moreira M, Nechaeva T, Nowak E, Pakuza C, Panuganti H, Pardons A, Perera A, Pucek J, Pukhov A, Ramjiawan RL, Rey S, Rieger K, Schmitz O, Senes E, Silva LO, Speroni R, Spitsyn RI, Stollberg C, Sublet A, Topaloudis A, Torrado N, Tuev PV, Turner M, Velotti F, Verra L, Verzilov VA, Vieira J, Vincke H, Welsch CP, Wendt M, Wing M, Wiwattananon P, Wolfenden J, Woolley B, Xia G, Zepp M, and Zevi Della Porta G

Abstract

We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of a long proton bunch in plasma. We show experimentally that, with sufficient initial amplitude [≥(4.1±0.4)  MV/m], the phase of the modulation along the bunch is reproducible from event to event, with 3%-7% (of 2π) rms variations all along the bunch. The phase is not reproducible for lower initial amplitudes. We observe the transition between these two regimes. Phase reproducibility is essential for deterministic external injection of particles to be accelerated.

Published
2021
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9. Proton Bunch Self-Modulation in Plasma with Density Gradient.

Author

Braunmüller F, Nechaeva T, Adli E, Agnello R, Aladi M, Andrebe Y, Apsimon O, Apsimon R, Bachmann AM, Baistrukov MA, Batsch F, Bergamaschi M, Blanchard P, Burrows PN, Buttenschön B, Caldwell A, Chappell J, Chevallay E, Chung M, Cooke DA, Damerau H, Davut C, Demeter G, Deubner LH, Dexter A, Djotyan GP, Doebert S, Farmer J, Fasoli A, Fedosseev VN, Fiorito R, Fonseca RA, Friebel F, Furno I, Garolfi L, Gessner S, Goddard B, Gorgisyan I, Gorn AA, Granados E, Granetzny M, Grulke O, Gschwendtner E, Hafych V, Hartin A, Helm A, Henderson JR, Howling A, Hüther M, Jacquier R, Jolly S, Kargapolov IY, Kedves MÁ, Keeble F, Kelisani MD, Kim SY, Kraus F, Krupa M, Lefevre T, Li Y, Liang L, Liu S, Lopes N, Lotov KV, Martyanov M, Mazzoni S, Medina Godoy D, Minakov VA, Moody JT, Morales Guzmán PI, Moreira M, Muggli P, Panuganti H, Pardons A, Peña Asmus F, Perera A, Petrenko A, Pucek J, Pukhov A, Ráczkevi B, Ramjiawan RL, Rey S, Ruhl H, Saberi H, Schmitz O, Senes E, Sherwood P, Silva LO, Spitsyn RI, Tuev PV, Turner M, Velotti F, Verra L, Verzilov VA, Vieira J, Welsch CP, Williamson B, Wing M, Wolfenden J, Woolley B, Xia G, Zepp M, and Zevi Della Porta G

Abstract

We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400 GeV proton bunch. Results show that a positive or negative gradient increases or decreases the number of microbunches and the relative charge per microbunch observed after 10 m of plasma. The measured modulation frequency also increases or decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradients adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory.

Published
2020
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10. Experimental validation of a novel compact focusing scheme for future energy-frontier linear lepton colliders.

Author

White GR, Ainsworth R, Akagi T, Alabau-Gonzalvo J, Angal-Kalinin D, Araki S, Aryshev A, Bai S, Bambade P, Bett DR, Blair G, Blanch C, Blanco O, Blaskovic-Kraljevic N, Bolzon B, Boogert S, Burrows PN, Christian G, Corner L, Davis MR, Faus-Golfe A, Fukuda M, Gao J, García-Morales H, Geffroy N, Hayano H, Heo AY, Hildreth M, Honda Y, Huang JY, Hwang WH, Iwashita Y, Jang S, Jeremie A, Kamiya Y, Karataev P, Kim ES, Kim HS, Kim SH, Kim YI, Komamiya S, Kubo K, Kume T, Kuroda S, Lam B, Lekomtsev K, Liu S, Lyapin A, Marin E, Masuzawa M, McCormick D, Naito T, Nelson J, Nevay LJ, Okugi T, Omori T, Oroku M, Park H, Park YJ, Perry C, Pfingstner J, Phinney N, Rawankar A, Renier Y, Resta-López J, Ross M, Sanuki T, Schulte D, Seryi A, Shevelev M, Shimizu H, Snuverink J, Spencer C, Suehara T, Sugahara R, Takahashi T, Tanaka R, Tauchi T, Terunuma N, Tomás R, Urakawa J, Wang D, Warden M, Wendt M, Wolski A, Woodley M, Yamaguchi Y, Yamanaka T, Yan J, Yokoya K, and Zimmermann F

Abstract

A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed in 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This scheme has many advantageous properties over previously studied focusing schemes, including being significantly shorter for a given energy and having a significantly better energy bandwidth. Experimental results from the ATF2 accelerator at KEK are presented that validate the operating principle of such a scheme by demonstrating the demagnification of a 1.3 GeV electron beam down to below 65 nm in height using an energy-scaled version of the compact focusing optics designed for the ILC collider.

Published
2014
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11. Improved direct measurement of the parity-violation parameter Ab using a mass tag and momentum-weighted track charge.

Author

Abe K, Abe K, Abe T, Adam I, Akimoto H, Aston D, Baird KG, Baltay C, Band HR, Barklow TL, Bauer JM, Bellodi G, Berger R, Blaylock G, Bogart JR, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Calcaterra A, Cassell R, Chou A, Cohn HO, Coller JA, Convery MR, Cook V, Cowan RF, Crawford G, Damerell CJ, Daoudi M, de Groot N, de Sangro R, Dong DN, Doser M, Dubois R, Erofeeva I, Eschenburg V, Fahey S, Falciai D, Fernandez JP, Flood K, Frey R, Hart EL, Hasuko K, Hertzbach SS, Huffer ME, Huynh X, Iwasaki M, Jackson DJ, Jacques P, Jaros JA, Jiang ZY, Johnson AS, Johnson JR, Kajikawa R, Kalelkar M, Kang HJ, Kofler RR, Kroeger RS, Langston M, Leith DW, Lia V, Lin C, Mancinelli G, Manly S, Mantovani G, Markiewicz TW, Maruyama T, McKemey AK, Messner R, Moffeit KC, Moore TB, Morii M, Muller D, Murzin V, Narita S, Nauenberg U, Neal H, Nesom G, Oishi N, Onoprienko D, Osborne LS, Panvini RS, Park CH, Peruzzi I, Piccolo M, Piemontese L, Plano RJ, Prepost R, Prescott CY, Ratcliff BN, Reidy J, Reinertsen PL, Rochester LS, Rowson PC, Russell JJ, Saxton OH, Schalk T, Schumm BA, Schwiening J, Serbo VV, Shapiro G, Sinev NB, Snyder JA, Staengle H, Stahl A, Stamer P, Steiner H, Su D, Suekane F, Sugiyama A, Suzuki S, Swartz M, Taylor FE, Thom J, Torrence E, Usher T, Va'vra J, Verdier R, Wagner DL, Waite AP, Walston S, Weidemann AW, Weiss ER, Whitaker JS, Williams SH, Willocq S, Wilson RJ, Wisniewski WJ, Wittlin JL, Woods M, Wright TR, Yamamoto RK, Yashima J, Yellin SJ, Young CC, and Yuta H

Abstract

We present an improved direct measurement of the parity-violation parameter A(b) in the Z boson-b-quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Z-->bb events via the topological reconstruction of the B hadron mass. Manipulation of the Stanford Linear Collider electron-beam polarization permits the measurement of A(b) to be made independently of other Z-pole coupling parameters. From the 1996-1998 sample of 400,000 hadronic Z decays, produced with an average beam polarization of 73.4%, we find A(b)=0.906+/-0.022(stat)+/-0.023(syst).

Published
2003
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12. Improved direct measurement of leptonic coupling asymmetries with polarized Z bosons.

Author

Abe K, Abe K, Abe T, Adam I, Akimoto H, Aston D, Baird KG, Baltay C, Band HR, Barklow TL, Bauer JM, Bellodi G, Berger R, Blaylock G, Bogart JR, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Calcaterra A, Cassell R, Chou A, Cohn HO, Coller JA, Convery MR, Cook V, Cowan RF, Crawford G, Damerell CJ, Daoudi M, de Groot N, de Sangro R, Dong DN, Doser M, Dubois R, Erofeeva I, Eschenburg V, Etzion E, Fahey S, Falciai D, Fernandez JP, Flood K, Frey R, Hart EL, Hasuko K, Hertzbach SS, Huffer ME, Huynh X, Iwasaki M, Jackson DJ, Jacques P, Jaros JA, Jiang ZY, Johnson AS, Johnson JR, Kajikawa R, Kalelkar M, Kang HJ, Kofler RR, Kroeger RS, Langston M, Leith DW, Lia V, Lin C, Mancinelli G, Manly S, Mantovani G, Markiewicz TW, Maruyama T, McKemey AK, Messner R, Moffeit KC, Moore TB, Morii M, Muller D, Murzin V, Narita S, Nauenberg U, Neal H, Nesom G, Oishi N, Onoprienko D, Osborne LS, Panvini RS, Park CH, Peruzzi I, Piccolo M, Piemontese L, Plano RJ, Prepost R, Prescott CY, Ratcliff BN, Reidy J, Reinertsen PL, Rochester LS, Rowson PC, Russell JJ, Saxton OH, Schalk T, Schumm BA, Schwiening J, Serbo VV, Shapiro G, Sinev NB, Snyder JA, Staengle H, Stahl A, Stamer P, Steiner H, Su D, Suekane F, Sugiyama A, Suzuki S, Swartz M, Taylor FE, Thom J, Torrence E, Usher T, Va'vra J, Verdier R, Wagner DL, Waite AP, Walston S, Weidemann AW, Weiss ER, Whitaker JS, Williams SH, Willocq S, Wilson RJ, Wisniewski WJ, Wittlin JL, Woods M, Wright TR, Yamamoto RK, Yashima J, Yellin SJ, Young CC, and Yuta H

Abstract

We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure A(e) = 0.1544+/-0.0060, A(mu) = 0.142+/-0.015, and A(tau) = 0.136+/-0.015. Combined with our left-right asymmetry measured from hadronic decays, we find A(e) = 0.1516+/-0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin (2)theta(eff)(W) = 0.230 98+/-0.000 26.

Published
2001
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13. High-precision measurement of the left-right Z Boson cross-section asymmetry.

Author

Abe K, Abe K, Abe T, Adam I, Akimoto H, Aston D, Baird KG, Baltay C, Band HR, Barklow TL, Bauer JM, Bellodi G, Berger R, Blaylock G, Bogart JR, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Calcaterra A, Cassell R, Chou A, Cohn HO, Coller JA, Convery MR, Cook V, Cowan RF, Crawford G, Damerell CJ, Daoudi M, Dasu S, de Groot N, de Sangro R, Dong DN, Doser M, Dubois R, Erofeeva I, Eschenburg V, Etzion E, Fahey S, Falciai D, Fernandez JP, Fero MJ, Flood K, Frey R, and Hart EL

Abstract

We present a measurement of the left-right cross-section asymmetry ( A(LR)) for Z boson production by e(+)e(-) collisions. The measurement includes the final data taken with the SLD detector at the SLAC Linear Collider during the period 1996-1998. Using a sample of 383 487 Z decays collected during the 1996-1998 runs we measure the pole value of the asymmetry, A(0)(LR), to be 0.150 56+/-0.002 39 which is equivalent to an effective weak mixing angle of sin (2)straight theta(eff)(W) = 0.231 07+/-0.000 30. Our result for the complete 1992-1998 data set comprising approximately 537 000 Z decays is sin (2)straight theta(eff)(W) = 0.230 97+/-0.000 27.

Published
2000
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14. First Measurement of the T-Odd Correlation between the Z0 Spin and the Three-Jet Plane Orientation in Polarized Z0 Decays into Three Jets.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Allen NJ, Ash WW, Aston D, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Daoudi M, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fero MJ, Frey R, Furuno K, Gillman T, and Gladding G

Published
1995
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15. Measurement of the average B hadron lifetime in Z0 decays using reconstructed vertices.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Allen NJ, Ash WW, Aston D, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Daoudi M, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, Gillman T, and Gladding G

Published
1995
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16. Measurement of the left-right forward-backward asymmetry for charm quarks with D*+ and D+ mesons.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Allen NJ, Ash WW, Aston D, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Daoudi M, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, and Gillman T

Published
1995
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17. Measurement of the parity-violation parameter Ab from the left-right forward-backward asymmetry of b quark production in Z0 decays using a momentum-weighted track-charge technique.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, and Gillman T

Published
1995
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18. Polarized Bhabha scattering and a precision measurement of the electron neutral current couplings.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, and Gillman T

Published
1995
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19. Measurement of the parity-violation parameters Ab and Ac from the left-right forward-backward asymmetry of leptons in hadronic events at the Z0 resonance.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, and Gillman T

Published
1995
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20. Search for jet handedness in hadronic Z0 decays.

Author

Abe K, Abt I I, Ahn CJ, Akagi T, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, Dell'Orso R, Dima M, Du PY, Dubois R, Eisenstein BI, Elia R, Falciai D, Fan C, Fero MJ, Frey R, Furuno K, and Gillman T

Published
1995
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21. Precise measurement of the left-right cross section asymmetry in Z boson production by e+e- collisions.

Author

Abe K, Abt I I, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Barklow T, Bazarko AO, Ben-David R, Benvenuti AC, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Church E, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, Decker FJ, De Sangro R, De Simone P, De Simone S, Dell'Orso R, Du YC, Dubois R, Duboscq JE, Eisenstein BI, Elia R, Emma P, Fan C, Fero MJ, Frey R, Furuno K, and Garwin EL

Published
1994
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22. Measurement of the charged multiplicity of Z0-->bb-bar events.

Author

Abe K, Abt I I, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Barakat MB, Baranko G, Bardon O, Battiston R, Bazarko AO, Bean A, Belcinski RJ, Ben-David R, Benvenuti AC, Biasini M, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Carr J, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Chadwick GB, Chen L, Church E, Claus R, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyle PA, Coyne DG, D'Oliveira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, De Simone S, Dell'Orso R, Du PY, Dubois R, Duboscq JE, and Eisentein BI

Published
1994
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23. Measurement of alpha s from jet rates at the Z0 resonance.

Author

Abe K, Abt I I, Acton PD, Agnew G, Ash WW, Aston D, Bacchetta N, Baird KG, Baltay C, Band HR, Baranko G, Bardon O, Battiston R, Bazarko AO, Bean A, Belcinski RJ, Ben-David R, Benvenuti AC, Biasini M, Bienz T, Bilei GM, Bisello D, Blaylock G, Bogart JR, Bolton T, Bower GR, Brau JE, Breidenbach M, Bugg WM, Burke D, Burnett TH, Burrows PN, Busza W, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Carpinelli M, Carr J, Cassell R, Castaldi R, Castro A, Cavalli-Sforza M, Chadwick GB, Chen L, Church E, Claus R, Cohn HO, Coller JA, Cook V V, Cotton R, Cowan RF, Coyle PA, Coyne DG, D'Oliverira A, Damerell CJ, Dasu S, De Sangro R, De Simone P, De Simone S, Dell'Orso R, Du YC, Dubois R, and Dunwoodie W

Published
1993
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24. First measurement of the left-right cross section asymmetry in Z boson production by e+e- collisions.

Author

Abe K, Abt I I, Acton PD, Adolphsen CE, Agnew G, Alber C, Alzofon DF, Antilogus P, Arroyo C, Ash WW, Ashford V V, Astbury A, Aston D, Au Y, Axen DA, Bacchetta N, Baird KG, Baker W, Baltay C, Band HR, Baranko G, Bardon O, Barrera F, Battiston R, Bazarko AO, Bean A, Beer G, Belcinski RJ, Bell RA, Ben-David R, Benvenuti AC, Berger R, Berridge SC, Bethke S, Biasini M, Bienz T, Bilei GM, Bird F, Bisello D, Blaylock G, Blumberg R, Bogart JR, Bolton T, Bougerolle S, Bower GR, Boyce RF, Brau JE, Breidenbach M, Browder TE, Bugg WM, Burgess B, Burke D, Burnett TH, Burrows PN, Busza W, Byers BL, Calcaterra A, Caldwell DO, Calloway D, Camanzi B, Camilleri L, Carpinelli M, Carr J, and Cartwright S

Published
1993
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