Search for an exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:math>baryon resonance at a mass near 1862 MeV in quasireal photoproduction

Airapetian, A.; Акопов, Н.; Akopov, Z.; Amarian, M.; Andrus, A.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetissian, E.; Bailey, P.; Balin, D. V.; Beckmann, M.; Belostotski, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Borissov, A.; Borysenko, A.; Bouwhuis, M.; Brüll, A.; Bryzgalov, V.; Capiluppi, M.; Capitani, G. P.; Chen, T.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Demey, M.; Nardo, L. De; Sanctis, E. De; Devitsin, E.; Diefenthaler, M.; Nezza, P. Di; Drechsler, J.; Düren, M.; Ehrenfried, M.; Elalaoui-Moulay, A.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Funel, A.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Garrow, K.; Gavrilov, G.; Gharibyan, V.; Giordano, F.; Grebeniouk, O.; Gregor, I. M.; Hadjidakis, C.; Hafidi, K.; Hartig, M.; Hasch, D.; Hesselink, W.H.A.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hommez, B.; Hristova, I.; Iarygin, G.; Ivanilov, A.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Kaiser, R.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, T.; Kopytin, M.; Коротков, В. А.; Kozlov, V.; Krauß, Bernhard; Krivokhijine, V. G.; Lagamba, L.; Lapikás, L.; Laziev, A.; Lenisa, P.; Liebing, P.; Linden-Levy, L. A.; Lorenzon, W.; Lu, H. Y.; Lu, J.; Lü, Shaozhe; Q., B.; Maiheu, B.; Makins, N.; Mao, Y.; Mariański, B.; Marukyan, H.; Masoli, F.; Mexner, V.; Meyners, N.; Michler, T.; Mikloukho, O.; Miller, C. A.; Miyachi, Y.; Muccifora, V.; Murray, M.; Нагайцев, А.; Nappi, E.; Naryshkin, Y.; Negodaev, M.; Nowak, W.-D.; Oganessyan, K.; Ohsuga, H.; Osborne, A.M.; Pickert, N.; Potterveld, D. H.; Raithel, Martin; Reggiani, D.; Reimer, P. E.; Reischl, A.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rosner, G.; Rostomyan, A.; Rubáček, L.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanjiev, I.; Savin, I.; Schäfer, Andreas; Schnell, G.; Schüler, K. P.; Seele, J.; Seidl, R.; Seitz, B.; Shearer, C.; Shibata, T. A.; Shutov, V.; Sinram, K.; Sommer, W.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Tait, P.; Tanaka, Hiroki; Taroian, S.; Tchuiko, B.; Terkulov, A.; Trzciński, A.; Tytgat, M.; Vandenbroucke, A.; Nat, P. B. van der; Steenhoven, G. van der; Haarlem, Y. Van; Vikhrov, V.; Vincter, M. G.; Vogel, Christian; Volmer, J.; Wang, S.; Wendland, J.; Ye, Y.; Ye, Z.; Yen, S.; Zihlmann, B.; Żuprański, P.

doi:10.1103/physrevd.71.032004

Cited by 53 publications

(78 citation statements)

References 36 publications

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“…The data from leptonic W -decays in polarized proton-proton collisions at RHIC [3][4][5][6][7] provide constraints in these global analyses, which now show a flavor asymmetry in the light sea-quark polarizations for parton momentum fractions, 0.05 < x < 0.25, at hard perturbative scales. The existence of such an asymmetry in the polarized PDFs has been searched for directly in semi-inclusive DIS experiments [8][9][10] but had thus far been established only in the case of the unpolarized PDFs. There, Drell-Yan measurements [11,12] and DIS measurements [13,14], in particular, have reported large enhancements in the ratio ofd overū antiquark distributions.…”

mentioning

confidence: 99%

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Adam¹,

Krueger²,

Kalinkin³

et al. 2019

Phys. Rev. D

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We report new STAR measurements of the single-spin asymmetries AL for W + and W − bosons produced in polarized proton-proton collisions at √ s = 510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb −1 . The results are combined with previous results obtained with 86 pb −1 . A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the ū and d quark helicity distributions for 0.05 < x < 0.25. In addition, we report new results for the double-spin asymmetries ALL for W ± , as well as AL for Z/γ * production and subsequent decay into electron-positron pairs.

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mentioning

confidence: 99%

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Adam¹,

Krueger²,

Kalinkin³

et al. 2019

Phys. Rev. D

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“…The left plot is for π + channel and the right plot is for π − channel at z = 0.46. The data are taken from [38].…”

Section: The Model Results For Dsamentioning

confidence: 99%

“…The model result for x variation ofÂ P LL (x, z, µ) are shown in Fig.11 and compared with the HERMES result [38] for π + and π − channels. We have taken the bin average values for z = 0.46 in the HERMES experiment.…”

Section: The Model Results For Dsamentioning

confidence: 99%

“…Since the parameter evolution is consistent with the DGLAP evolution, the helicity PDF and unpolarized PDF are evolved in parameter evolution approach. [38][39][40] and denoted by the blue color with experimental error bar. The red dash doted line represents the asymmetry when all the distributions(f 1 and g 1 ) are at initial scale µ 0 .…”

Section: The Model Results For Dsamentioning

confidence: 99%

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Model predictions for azimuthal spin asymmetries for HERMES and COMPASS kinematics

2017

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We have presented the results for the single and double spin asymmetries in semi-inclusive deep inelastic scatterings for proton in a light front quark-diquark model. The asymmetries generated by the T-even TMDs are discussed here. The model predictions are found to agree with the available data. We also present our model predictions for the Collins asymmetry for the future electron-ion collider experiments.

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“…However, a deluge of contrary experimental results followed this one positive claim for a cascade pentaquark. At least ten results have been released which repudiate the existence of the states seen by NA-49: from WA-89 [40], CDF [38], HERA-B [36], ALEPH [39], HERMES [41], FOCUS [42], BaBar [43], ZEUS [44], COMPASS [45], and E690/Fermilab [46]. In general, the negative reports have much higher statistics than the original positive report, and came from pp, ep, pA, and γA experiments.…”

Section: Experimental Evidencementioning

confidence: 99%

The Rise and Fall of Pentaquarks in Experiments

Schumacher¹

2006

AIP Conference Proceedings

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Abstract.Experimental evidence for and against the existence of pentaquarks has accumulated rapidly in the last three years. If they exist, they would be dramatic examples of hadronic states beyond our well-tested and successful particle models. The positive evidence suggests existence of baryonic objects with widths of at most a few MeV, some displaying exotic quantum numbers, such as baryons with strangeness S = +1. The non-observations of these states have often come from reaction channels very different from the positive evidence channels, making comparisons difficult. The situation has now been largely clarified, however, by high-statistics repetitions of the positive sightings, with the result that none of the positive sightings have been convincingly reproduced. The most recent unconfirmed positive sightings suffer again from low statistics and large backgrounds. It seems that a kind of "bandwagon" effect led to the overly-optimistic interpretation of numerous experiments in the earlier reports of exotic pentaquarks.

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Search for an exoticS=−2,Q=−2baryon resonance at a mass near 1862 MeV in quasireal photoproduction

Cited by 53 publications

References 36 publications

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Model predictions for azimuthal spin asymmetries for HERMES and COMPASS kinematics

The Rise and Fall of Pentaquarks in Experiments

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