Study of the orientation and energy partition of three-jet events in hadronic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>decays

Abe, K.; Abt, I.; Akagi, T.; Allen, N.J.; Ash, W. W.; Aston, D.; Baird, K.; Baltay, C.; Band, H. R.; Barakat, M.B.; Baranko, G.; Bardon, O.; Barklow, T.; Bashindzhagyan, G. L.; Bazarko, A.O.; Ben‐David, R.; Benvenuti, A. C.; Bilei, G. M.; Bisello, D.; Blaylock, G.; Bogart, J. R.; Bolton, T.; Bower, G. R.; Brau, J. E.; Breidenbach, M.; Bugg, W.; Burke, D. L.; Burnett, T. H.; Burrows, P.N.; Busza, W.; Calcaterra, A.; Caldwell, D. O.; Calloway, D.; Camanzi, B.; Carpinelli, M.; Cassell, R.; Castaldi, R.; Castro, A.; Cavalli‐Sforza, M.; Chou, A.; Church, E.; Cohn, H. O.; Coller, J. A.; Cook, V.; Cotton, R.; Cowan, R.; Coyne, D. G.; Crawford, G.; D’Oliveira, A.; Damerell, Chris; Daoudi, M.; Sangro, R. de; Simone, P. De; Dell’Orso, R.; Dervan, P.; Dima, M.; Dong, D.; Du, P.Y.C.; Dubois, R.; Eisenstein, B. I.; Elia, R.; Etzion, E.; Falciai, D.; Fan, C.; Fero, M. J.; Frey, R.; Furuno, K.; Gillman, T.; Gladding, G. E.; González, S.; Hallewell, G. D.; Hart, E. L.; Hasan, A.; Hasegawa, Y.; Hasuko, K.; Hedges, S.; Hertzbach, S. S.; Hildreth, M.; Huber, J.; Huffer, M.E.; Hughes, E. W.; Hwang, H.; Iwasaki, Y.; Jackson, David Jeff; Jacques, P.; Jaros, J. A.; Johnson, A.; Johnson, J. R.; Johnson, R. A.; Junk, T. R.; Kajikawa, R.; Kalelkar, M.; Kang, H. J.; Karliner, I.; Kawahara, H.; Kendall, H.W.; Kim, Y.; King, M.; King, R. S. B.; Kofler, R.; Krishna, N.M.; Kroeger, R.; Labs, J. F.; Langston, M.; Lath, A.; Lauber, J.; Leith, D.W.G.S.; Lia, V.; Liu, M. X.; Liu, X.; Loreti, M.; Lu, A.; Lynch, H. L.; Ma, J.; Mancinelli, G.; Manly, S.; Mantovani, G.; Markiewicz, T. W.; Maruyama, T.; Massetti, R.; Masuda, Hiroaki; Mazzucato, E.; McKemey, A. K.; Meadows, B.; Messner, R.; Mockett, P.; Moffeit, K. C.; Mours, B.; Müller, D. R.; Nagamine, T.; Narita, S.; Nauenberg, U.; Neal, H. A.; Nussbaum, M.; Ohnishi, Y.; Osborne, L.S.; Panvini, R. S.; Park, H.; Pavel, T.; Peruzzi, I.; Piccolo, M.; Piemontese, L.; Pieroni, E.; Pitts, K.; Plano, R. J.; Prepost, R.; Prescott, C. Y.; Punkar, G. D.; Quigley, J.; Ratcliff, B. N.; Reeves, T. W.; Reidy, J.; Rensing, P.; Rizzo, Thomas G.; Rochester, L.S.; Rowson, P. C.; Russell, J. J.; Saxton, O. H.; Schalk, T.; Schindler, R. H.; Schumm, B. A.; Sen, S.; Serbo, V.V.; Shaevitz, M. H.; Shank, J. T.; Shapiro, G.; Sherden, D. J.; Shmakov, K.; Simopoulos, C.; Sinev, N. B.; Smith, S. R.; Snyder, J. A.; Stamer, P.; Steiner, H.; Steiner, R.; Strauss, M. G.; Su, D.; Suekane, F.; Sugiyama, A.; Suzuki, Shingo; Swartz, M.; Szumilo, A.; Takahashi, Tohru; Taylor, F. Ë.; Torrence, E.; Trandafir, A. I.; Turk, J. D.; Usher, T.; Va’vra, J.; Vannini, C.; Vella, E.; Venuti, J. P.; Verdier, R.; Verdini, P. G.; Wagner, S. R.; Waite, A. P.; Watts, S.; Weidemann, A. W.; Weiss, E. R.; Whitaker, J. S.; White, S. L.; Wickens, F. J.; Williams, D.; Williams, D. C.; Williams, S.; Willocq, S.; Wilson, Robert S.; Wisniewski, W. J.; Woods, M.; Word, G. B.; Wyss, J.; Yamamoto, R. K.; Yamartino, J. M.; Yang, Ximeng; Yellin, S.; Young, C. C.; Yuta, H.; Zapalac, G.; Zdarko, R. W.; Zeitlin, C.; Zhou, Jianfeng

doi:10.1103/physrevd.55.2533

Cited by 28 publications

(12 citation statements)

References 29 publications

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“…Well contained hadronic events [9] are selected and jets are counted in each using six collinear-and infrared-safe algorithms, with a set of optimized y cut values. A combination [1] of the event n (2) sig and the masses and momenta of the secondary vertices (if any) in each jet is used to tag each event as light(uds)-, c-, or b-flavor. The 3-jet rates R 3 in these three subsamples are unfolded for the effects of hadronization, detector efficiency and tagging efficiencies and biases, and the ratios r c = R c 3 /R uds All six r c values are consistent with unity, however only one r b value is within one standard deviation of unity.…”

Section: Flavor Independence and M Bmentioning

confidence: 99%

“…Experimental studies of the structure of 3-jet events have typically used energy and angle distributions of energy-ordered jets. Since the gluon is expected to be the lowestenergy jet in most events, this suffices to confirm the qqg origin of such events and to determine the gluon spin [2]. The identification of the three jets in such events would allow more complete and stringent tests of QCD.…”

Section: Introductionmentioning

confidence: 99%

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Recent Tests of QCD at SLD

Müller¹

2001

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We present selected results on strong interaction physics from the SLD experiment at the SLAC Linear Collider. We report on several new studies of 3-and 4-jet hadronic Z 0 decays, in which jets are identified as quark, antiquark or gluon. The 3-jet Z 0 → bbg rate is sensitive to the b-quark mass; prospects for measuring m b are discussed. The gluon energy spectrum is measured over the full kinematic range, providing an improved test of QCD and limits on anomalous bbg couplings. The parity violation in Z 0 → bbg decays is consistent with electroweak theory plus QCD. New tests of T-and CP-conservation at the bbg vertex are performed. A new measurement of the rate of gluon splitting into bb pairs yields g bb = 0.0031±0.0007(stat.)±0.0006(syst.) (Preliminary). We also present a number of new results on jet fragmentation into identified hadrons. The B hadron energy spectrum is measured over the full kinematic range using a new, inclusive technique, allowing stringent tests of predictions for its shape and a precise measurement of x B = 0.714 ± 0.005(stat.) ± 0.007(syst.) (Preliminary). A detailed study of correlations in rapidity y between pairs of identified π ± , K ± and p/p confirms that strangeness and baryon number are conserved locally, and shows local charge conservation between meson-baryon and strange-nonstrange pairs. Flavor-dependent long-range correlations are observed for all combinations of these hadron species, yielding new information on leading particle production. The first study of correlations using rapidities signed such that y > 0 corresponds to the quark direction provides additional new insights into fragmentation, including the first direct observation of baryon number ordering along the qq axis.

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Section: Flavor Independence and M Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Tests of QCD at SLD

Müller¹

2001

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“…At lowest order with massless partons, we have This angle is particularly sensitive to the spin of the gluon. Figure 4 displays the x i and Ellis-Karliner angle distributions for 3-jet events as determined 19 by SLD at √ s = M Z . In this figure, the data is compared with expectations for the distributions from leading-order vector, scalar, and tensor gluon models; it is clear that the data prefer the vector case.…”

Section: Three-jet Eventsmentioning

confidence: 99%

The Standard Model and Why We Believe It

Hewett¹

1998

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“…Experimental studies of the structure of events containing three hadronic jets in e + e − annihilation have been limited by difficulties in identifying which jet is due to the quark, which to the antiquark and which to the gluon. Since the gluon is expected to be the lowest-energy jet in most events, the predictions of QCD have been tested using energy and angle distributions of energy-ordered jets, and this is sufficient to confirm the qqg origin of such events and to determine the gluon spin [1]. Tagging of the origin of any two of the three jets in such events would allow more complete and stringent tests of QCD predictions.…”

Section: Introductionmentioning

confidence: 99%

QCD Tests Using b-bbar-g Events and a new Measurement of the B Hadron Energy Distribution

Müller¹

1998

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We present new studies of 3-jet final states from hadronic Z 0 decays recorded by the SLD experiment, in which jets are identified as quark, antiquark or gluon. Our gluon energy spectrum, measured over the full kinematic range, is consistent with the predictions of QCD, and we derive a limit on an anomalous chromomagnetic bbg coupling. We measure the parity violation in Z 0 decays into bbg to be consistent with the predictions of electroweak theory and QCD, and perform new tests of T-and CP-conservation at the bbg vertex. We also present a new technique for reconstructing the energy of a B hadron using the set of charged tracks attached to a secondary vertex. The B hadron energy spectrum is measured over the full kinematic range, allowing improved tests of predictions for the shape of the spectrum. The average scaled energy is measured to be < x B >= 0.719 ± 0.005(stat.) (Preliminary).

show abstract

Study of the orientation and energy partition of three-jet events in hadronicZ0decays

Cited by 28 publications

References 29 publications

Recent Tests of QCD at SLD

Recent Tests of QCD at SLD

The Standard Model and Why We Believe It

QCD Tests Using b-bbar-g Events and a new Measurement of the B Hadron Energy Distribution

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