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Mason D, Brau J, Drucker RB, Frey R, Spentzouris P, Conrad J, Fleming BT, Formaggio J, Kim JH, Koutsoliotas S, McNulty C, Romosan A, Shaevitz MH, Stern EG, Vaitaitis A, Zimmerman ED, Johnson RA, Suwonjandee N, Vakili M, Bernstein RH, Bugel L, Lamm MJ, Marsh W, Nienaber P, Tobien N, Yu J, Adams T, Alton A, Bolton T, Goldman J, Goncharov M, de Barbaro L, Buchholz D, Schellman H, Zeller GP, Boyd S, McDonald J, Naples D, Radescu V, Tzanov M, Avvakumov S, de Barbaro P, Bodek A, Budd H, Harris DA, McFarland KS, Sakumoto WK, Yang UK. Measurement of the nucleon strange-antistrange asymmetry at next-to-leading order in QCD from NuTeV Dimuon data. Phys Rev Lett 2007; 99:192001. [PMID: 18233069 DOI: 10.1103/physrevlett.99.192001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2007] [Indexed: 05/25/2023]
Abstract
We present a new measurement of the difference between the nucleon strange and antistrange quark distributions from dimuon events recorded by the NuTeV experiment at Fermilab. This analysis is the first to use a complete next to leading order QCD description of charm production from neutrino scattering. Dimuon events in neutrino deep inelastic scattering allow direct and independent study of the strange and antistrange content of the nucleon. We find a positive strange asymmetry with a significance of 1.6sigma. We also report a new measurement of the charm mass.
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Affiliation(s)
- D Mason
- University of Oregon, Eugene, OR, USA
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Avvakumov S, Adams T, Alton A, de Barbaro L, de Barbaro P, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Fleming BT, Frey R, Formaggio JA, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McDonald J, McFarland KS, McNulty C, Naples D, Nienaber P, Radescu V, Romosan A, Sakumoto WK, Schellman H, Shaevitz MH, Spentzouris P, Stern EG, Suwonjandee N, Tzanov M, Vakili M, Vaitaitis A, Yang UK, Yu J, Zeller GP, Zimmerman ED. Search for nu(mu)-->nu(e) and nu(mu)-->nu(e) oscillations at NuTeV. Phys Rev Lett 2002; 89:011804. [PMID: 12097033 DOI: 10.1103/physrevlett.89.011804] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2002] [Indexed: 05/23/2023]
Abstract
Limits on nu(mu)-->nu(e) and nu(mu)-->nu(e) oscillations are extracted using the NuTeV detector with sign-selected nu(mu) and nu(mu) beams. In nu(mu) mode, for the case of sin(2)2alpha = 1, Delta(m)(2)>2.6 eV(2) is excluded, and for Delta(m)(2)>>1000 eV(2), sin(2)2alpha>1.1 x 10(-3). The NuTeV data exclude the high Delta(m)(2) end of nu(mu)-->nu(e) oscillation parameters favored by the LSND experiment without the need to assume that the oscillation parameters for nu and nu are the same. We present the most stringent experimental limits for nu(mu)(nu(mu))-->nu(e)(nu(e)) oscillations in the large Delta(m)(2) region.
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Affiliation(s)
- S Avvakumov
- University of Rochester, Rochester, New York 14627, USA
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Zeller GP, McFarland KS, Adams T, Alton A, Avvakumov S, de Barbaro L, de Barbaro P, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Fleming BT, Frey R, Formaggio JA, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McDonald J, McNulty C, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman H, Shaevitz MH, Spentzouris P, Stern EG, Suwonjandee N, Tzanov M, Vakili M, Vaitaitis A, Yang UK, Yu J, Zimmerman ED. Precise determination of electroweak parameters in neutrino-nucleon scattering. Phys Rev Lett 2002; 88:091802. [PMID: 11863995 DOI: 10.1103/physrevlett.88.091802] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2001] [Indexed: 05/23/2023]
Abstract
The NuTeV Collaboration has extracted the electroweak parameter sin(2)theta(W) from the measurement of the ratios of neutral current to charged current nu and (-)nu cross sections. Our value, sin(2)theta((on-shell))(W) = 0.2277 +/- 0.0013(stat) +/- 0.0009(syst), is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.
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Affiliation(s)
- G P Zeller
- Northwestern University, Evanston, Illinois 60208, USA
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Yang UK, Adams T, Alton A, Arroyo CG, Avvakumov S, de Barbaro L, de Barbaro P, Bazarko AO, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Fleming BT, Formaggio JA, Frey R, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, King BJ, Kinnel T, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McFarland KS, McNulty C, Mishra SR, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman H, Sciulli FJ, Seligman WG, Shaevitz MH, Smith WH, Spentzouris P, Stern EG, Suwonjandee N, Vaitaitis A, Vakili M, Yu J, Zeller GP, Zimmerman ED. Extraction of R = sigma(L)/sigma(T) from CCFR nu(mu)-Fe and nu(mu)-Fe differential cross sections. Phys Rev Lett 2001; 87:251802. [PMID: 11736561 DOI: 10.1103/physrevlett.87.251802] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2001] [Indexed: 05/23/2023]
Abstract
We report on the extraction of R = sigma(L)/sigma(T) from CCFR nu(mu)-Fe and nu(mu)-Fe differential cross sections. The CCFR differential cross sections do not show the deviations from the QCD expectations that are seen in the CDHSW data at very low and very high x. R as measured in nu(mu) scattering is in agreement with R as measured in muon and electron scattering. All data on R for Q(2)>1 GeV(2) are in agreement with a NNLO QCD calculation which uses NNLO parton distribution functions and includes target mass effects. We report on the first measurements of R in the low x and Q(2)<1 GeV(2) region (where an anomalous large rise in R for nuclear targets has been observed by the HERMES Collaboration).
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Affiliation(s)
- U K Yang
- University of Rochester, Rochester, New York 14627, USA
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Formaggio JA, Yu J, Adams T, Alton A, Avvakumov S, de Barbaro L, de Barbaro P, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad JM, Drucker RB, Fleming BT, Foster J, Frey R, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McDonald J, McFarland KS, McNulty C, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman HM, Shaevitz MH, Spentzouris P, Stern EG, Suwonjandee N, Vakili M, Vaitaitis A, Yang UK, Zeller GP, Zimmerman ED. Search for the lepton family number violating process nu(mu)e(-) --> mu(-)nu(e). Phys Rev Lett 2001; 87:071803. [PMID: 11497881 DOI: 10.1103/physrevlett.87.071803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2001] [Indexed: 05/23/2023]
Abstract
The NuTeV experiment at Fermilab has used a sign-selected neutrino beam to perform a search for the lepton number violating process nu(mu)e(-)-->mu(-)nu(e), and to measure the cross section of the standard model inverse muon decay process nu(mu)e(-)-->mu(-)nu(e). NuTeV measures the inverse muon decay asymptotic cross-section slope sigma/E to be (13.8 +/- 1.2 +/- 1.4) x 10(-42) cm(2)/GeV. The experiment also observes no evidence for lepton number violation and places one of the most restrictive limits on the cross-section ratio sigma(nu(mu)e(-)-->mu(-)nu(e))/sigma(nu(mu)e(-)-->mu(-)nu(e)) < or = 1.7% at 90% C.L. for V-A couplings and < or = 0.6% for scalar couplings.
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Adams T, Alton A, Avvakumov S, de Barbaro L, de Barbaro P, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Fleming BT, Frey R, Formaggio JA, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McDonald J, McNulty C, McFarland KS, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman H, Shaevitz MH, Spentzouris P, Stern EG, Suwonjandee N, Tzanov M, Vakili M, Vaitaitis A, Yang UK, Yu J, Zeller GP, Zimmerman ED. Observation of an anomalous number of dimuon events in a high energy neutrino beam. Phys Rev Lett 2001; 87:041801. [PMID: 11461608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 04/19/2001] [Indexed: 05/23/2023]
Abstract
A search for long-lived neutral particles ( N0's) with masses above 2.2 GeV/c(2) that decay into at least one muon has been performed using an instrumented decay channel at the NuTeV experiment at Fermilab. Data were examined for particles decaying into the final states mumu, mu(e), and mu(pi). Three mumu events were observed over an expected standard model background of 0.069+/-0.010 events; no events were observed in the other modes.
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Affiliation(s)
- T Adams
- Kansas State University, Manhattan, Kansas 66506, USA
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Fleming BT, Adams T, Alton A, Arroyo CG, Avvakumov S, de Barbaro L, de Barbaro P, Bazarko AO, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Formaggio JA, Frey R, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, King BJ, Kinnel T, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McFarland KS, McNulty C, Mishra SR, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman H, Sciulli FJ, Seligman WG, Shaevitz MH, Smith WH, Spentzouris P, Stern EG, Suwonjandee N, Vaitaitis A, Vakili M, Yang UK, Yu J, Zeller GP, Zimmerman ED. First measurement of the low- x, low- Q(2) structure function F(2) in neutrino scattering. Phys Rev Lett 2001; 86:5430-5433. [PMID: 11415268 DOI: 10.1103/physrevlett.86.5430] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2000] [Indexed: 05/23/2023]
Abstract
A new structure function analysis of CCFR deep inelastic nu-N and nu-N scattering data is presented for previously unexplored kinematic regions down to Bjorken x = 0.0045 and Q(2) = 0.3 GeV(2). Comparisons to charged lepton scattering data from NMC and E665 experiments are made and the behavior of the structure function F(2)(nu)2 is studied in the limit Q(2)-->0.
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Affiliation(s)
- B T Fleming
- Columbia University, New York, New York 10027, USA
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Yang UK, Adams T, Alton A, Arroyo CG, Avvakumov S, de Barbaro L, de Barbaro P, Bazarko AO, Bernstein RH, Bodek A, Bolton T, Brau J, Buchholz D, Budd H, Bugel L, Conrad J, Drucker RB, Fleming BT, Formaggio JA, Frey R, Goldman J, Goncharov M, Harris DA, Johnson RA, Kim JH, King BJ, Kinnel T, Koutsoliotas S, Lamm MJ, Marsh W, Mason D, McFarland KS, McNulty C, Mishra SR, Naples D, Nienaber P, Romosan A, Sakumoto WK, Schellman H, Sciulli FJ, Seligman WG, Shaevitz MH, Smith WH, Spentzouris P, Stern EG, Suwonjandee N, Vaitaitis A, Vakili M, Yu J, Zeller GP, Zimmerman ED. Measurements of F2 and xF(nu)(3) - xF(nu;)(3) from CCFR nu(mu)-Fe and nu;(mu)-Fe Data in a Physics Model-Independent Way. Phys Rev Lett 2001; 86:2742-2745. [PMID: 11290028 DOI: 10.1103/physrevlett.86.2742] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2000] [Indexed: 05/23/2023]
Abstract
We report on the extraction of the structure functions F2 and DeltaxF(3) = xF(nu)(3)-xF(nu;)(3) from CCFR nu(mu)-Fe and nu;(mu)-Fe differential cross sections. The extraction is performed in a physics model-independent (PMI) way. This first measurement of DeltaxF(3), which is useful in testing models of heavy charm production, is higher than current theoretical predictions. The ratio of the F2 (PMI) values measured in nu(mu) and mu scattering is in agreement (within 5%) with the predictions of next-to-leading-order parton distribution functions using massive charm production schemes, thus resolving the long-standing discrepancy between the two sets of data.
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Affiliation(s)
- U K Yang
- University of Cincinnati, Cincinnati, OH 45221, USA
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