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Implications of W-Boson Mass Anomaly for Atomic Parity Violation. ATOMS 2022. [DOI: 10.3390/atoms10040149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We consider the implications of the recent measurement of the W-boson mass MW=80,433.5±9.4MeV/c2 for atomic parity violation experiments. We show that the change in MW shifts the Standard Model prediction for the 133Cs nuclear weak charge to QW(133Cs)=−73.11(1), i.e., by 8.5σ from its current value, and the proton weak charge by 2.7%. The shift in QW(133Cs) ameliorates the tension between existing determinations of its value and motivates more accurate atomic theory calculations, while the shift in QW(p) inspires next-generation atomic parity violation experiments with hydrogen. Using our revised value for QW(133Cs), we also readjust constraints on parameters of physics beyond the Standard Model. Finally, we reexamine the running of the electroweak coupling for the new W boson mass.
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Gover A. Superradiant spin-flip radiative emission of a spin-polarized free-electron beam. PHYSICAL REVIEW LETTERS 2006; 96:124801. [PMID: 16605913 DOI: 10.1103/physrevlett.96.124801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2006] [Indexed: 05/08/2023]
Abstract
Radiative emission from the magnetic moments of the spins of an electron beam has never been observed directly, because it is fundamentally much weaker than the electric charge emission. We show that the detectivity of spin-flip and combined spin-flip-cyclotron-resonance-emission radiation can be substantially enhanced by operating with ultrashort spin-polarized electron beam bunches under conditions of superradiant (coherent) emission. The proposed superradiant spin-flip radiative emission scheme can be used for noninvasive diagnostics of polarized electron or positron beams. Such beams are of relevance in important scattering experiments off nucleons in nuclear physics and off magnetic targets in condensed matter physics.
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Affiliation(s)
- A Gover
- Faculty of Engineering, Department of Physical Electronics, Tel-Aviv University, Ramat-Aviv 69978, Tel-Aviv, Israel
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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 CJS, 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 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. Direct measurements of Ab and Ac using vertex and kaon charge tags at the SLAC detector. PHYSICAL REVIEW LETTERS 2005; 94:091801. [PMID: 15783953 DOI: 10.1103/physrevlett.94.091801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Indexed: 05/24/2023]
Abstract
Exploiting the manipulation of the SLAC Linear Collider electron-beam polarization, we present precise direct measurements of the parity-violation parameters A(c) and A(b) 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 400 000 Z decays, produced with an average beam polarization of 73.4%, we find A(c)=0.673+/-0.029(stat)+/-0.023(syst) and A(b)=0.919+/-0.018(stat)+/-0.017(syst).
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Affiliation(s)
- Koya Abe
- Tohoku University, Sendai, 980 Japan
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4
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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 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. Improved direct measurement of the parity-violation parameter Ab using a mass tag and momentum-weighted track charge. PHYSICAL REVIEW LETTERS 2003; 90:141804. [PMID: 12731908 DOI: 10.1103/physrevlett.90.141804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2002] [Indexed: 05/24/2023]
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).
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Affiliation(s)
- Kenji Abe
- Nagoya University, Chikusa-ku, Nagoya, 464 Japan
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5
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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 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. Improved direct measurement of A(b) and A(c) at the Z(0) pole using a lepton tag. PHYSICAL REVIEW LETTERS 2002; 88:151801. [PMID: 11955189 DOI: 10.1103/physrevlett.88.151801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2001] [Indexed: 05/23/2023]
Abstract
The parity violation parameters A(b) and A(c) of the Zb(b) and Zc(c) couplings have been measured directly, using the polar angle dependence of the polarized cross sections at the Z(0) pole. Bottom and charmed hadrons were tagged via their semileptonic decays. Both the electron and muon analyses take advantage of new multivariate techniques to increase the analyzing power. Based on the 1993-1998 SLD sample of 550,000 Z(0) decays produced with highly polarized electron beams, we measure A(b) = 0.919+/-0.030(stat)+/-0.024(syst), and A(c) = 0.583+/-0.055(stat)+/-0.055(syst).
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Affiliation(s)
- Kenji Abe
- Nagoya University Chikusa-ku, Nagoya, 464 Japan
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6
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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, Yuta H. Improved direct measurement of leptonic coupling asymmetries with polarized Z bosons. PHYSICAL REVIEW LETTERS 2001; 86:1162-1166. [PMID: 11178034 DOI: 10.1103/physrevlett.86.1162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2000] [Indexed: 05/23/2023]
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.
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Affiliation(s)
- K Abe
- Amori University, Aomori, 030 Japan
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Riordan M, Rowson PC, Wu SL. Particle physics. The search for the Higgs boson. Science 2001; 291:259-60. [PMID: 11253214 DOI: 10.1126/science.1057739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- M Riordan
- Stanford Linear Accelerator Center, Stanford, CA 94309, USA.
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8
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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. First direct measurement of the parity-violating coupling of the Z0 to the s quark. PHYSICAL REVIEW LETTERS 2000; 85:5059-5063. [PMID: 11102186 DOI: 10.1103/physrevlett.85.5059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2000] [Indexed: 05/23/2023]
Abstract
We present the first direct measurement of A(s), the parity-violating coupling of the Z0 boson to the strange quark, using approximately 550 000 e(+)e(-)-->Z0-->hadrons events recorded by the SLC Large Detector with a polarized e(-) beam. We tagged Z0-->s&smacr; events by the absence of B or D hadrons and the presence in each hemisphere of a high momentum K+/- or K(0)(s). Fitting the polar angle distributions of the strangeness-signed thrust axis gave A(s) = 0.895+/-0.066(stat)+/-0.062(syst). The analyzing power and uu+d&dmacr; background were constrained using the data, greatly reducing any model dependence.
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Affiliation(s)
- OH Saxton
- Tohoku University, Sendai, 980 Japan
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