Direct Observation of the Strange<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi></mml:math>Baryon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Ξ</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:math>

Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M. R.; Adams, T.; Aguiló, E.; Ahn, S. H.; Ahsan, M.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Anastasoaie, M.; Ancu, L. S.; Andeen, T.; Anderson, S.; Andrieu, Bernard; Anzelc, M. S.; Arnoud, Y.; Arov, M.; Arthaud, M.; Askew, A.; Åsman, B.; Jesus, A. C.S. Assis; Atramentov, O.; Autermann, C.; Ávila, C.; Ay, C.; Badaud, F.; Baden, A.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Banerjee, P.; Barberis, E.; Barfuss, A. F.; Bargassa, P.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bauer, D.; Beale, S.; Bean, A.; Begalli, M.; Begel, M.; Bélanger-Champagne, C.; Bellantoni, L.; Bellavance, A.; Benitez, J. A.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Berntzon, L.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. 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W.; Meyer, J.; Meyer, A.; Michaut, M.; Millet, T.; Mitrevski, J.; Molina, J.; Mommsen, R. K.; Mondal, N. K.; Moore, R. W.; Moulik, T.; Muanza, G. S.; Mulders, M.; Mulhearn, M.; Mundal, O.; Mundim, L.; Nagy, E.; Naimuddin, M.; Narain, M.; Naumann, N. A.; Neal, H. A.; Negret, J. P.; Neustroev, P.; Nilsen, H.; Nomerotski, A.; Novaes, S. F.; Nunnemann, T.; O’Dell, V.; O’Neil, D. C.; Obrant, G.; Ochando, C.; Onoprienko, D.; Oshima, N.; Osta, J.; Otec, R.; Garzón, G. J. Otero Y; Owen, M.; Padley, P.; Pangilinan, M.; Panov, G.V.; Parashar, N.; Park, S. J.; Park, S. K.; Parsons, J. A.; Partridge, R.; Parua, N.; Patwa, A.; Pawloski, G.; Penning, B.; Perea, P. M.; Peters, K.; Peters, Y.; Pétroff, P.; Petteni, M.; Piegaia, R.; Piper, J.; Pleier, M. A.; Podesta-Lerma, P. L.M.; Podstavkov, V. M.; Pogorelov, Y.; Pol, M. E.; Polozov, P.; Pompocš, A.; Pope, B. G.; Popov, A.; Potter, C. T.; Silva, W. L. Prado Da; Prosper, H.; Protopopescu, S.; Qian, J.; Quadt, A.; Quinn, B.; Rakitine, A.; Rangel, M. 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W.; Wimpenny, S.; Wobisch, M.; Wood, D.; Wyatt, T. R.; Xie, Y.; Yacoob, S.; Yamada, R.; Yan, M.; Yasuda, T.; Yatsunenko, Y. A.; Yip, K.; Yoo, H. D.; Youn, S. W.; Yu, J.; Chen, Yu; Yurkewicz, A.; Zatserklyaniy, A.; Zeitnitz, C.; Zhang, D.; Zhao, T.; Zhou, B.; Zhu, J.; Zieliński, M.; Ziemińska, D.; Ziemiński, A.; Živković, L.; Zutshi, V.; Zverev, E. G.

doi:10.1103/physrevlett.99.052001

Cited by 115 publications

(61 citation statements)

References 11 publications

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“…While both the D0 and CDF collaborations have claimed the observation of the À b !J=c À decay, the reported mass values, 6165AE10ðstat:ÞAE13ðsyst:Þ MeV=c 2 from D0 [4] and 6054:4 AE 6:8ðstat:Þ AE 0:9ðsyst:Þ MeV=c 2 from CDF [5], differ by more than 6 standard deviations. On the other hand, there is good agreement between the mass measurements of the Ä À b (bsd) baryon, which has also been observed by D0 [6] and CDF [7] in the Ä À b ! J=c Ä À mode and, more recently, by CDF [8] …”

supporting

confidence: 78%

See 1 more Smart Citation

Measurement of theΛb0,Ξb−, andΩb−

Aaij¹,

Beteta²,

Adametz³

et al. 2013

Phys. Rev. Lett.

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Hadrons are systems bound by the strong interaction, described at the fundamental level by quantum chromodynamics (QCD). While QCD is well understood at high energy in the perturbative regime, low-energy phenomena such as the binding of quarks and gluons within hadrons are more difficult to predict. Several models and techniques, such as constituent quark models or lattice QCD calculations, attempt to reproduce the spectrum of the measured hadron masses (for a review, see Ref.[1]). While the masses of all expected ground-state mesons are now well measured, baryon data are still sparse. In particular, only six out of the sixteen b-baryon ground states predicted by the quark model have been observed so far [2]. A complete and reliable experimental mass spectrum would allow for precision tests of a variety of QCD models [3].The mass measurement of the heaviest observed b baryon, the The LHCb detector [9] is a single-arm forward spectrometer covering the pseudorapidity range 2 < < 5, designed for the study of particles containing b or c quarks. The detector includes a high precision tracking system consisting of a silicon-strip vertex detector surrounding the pp interaction region, a large-area silicon-strip detector located upstream of a dipole magnet with a bending power of about 4 T m, and three stations of silicon-strip detectors and straw drift tubes placed downstream. The combined tracking system has a momentum resolution Áp=p that varies from 0.4% at 5 GeV=c to 0.6% at 100 GeV=c, and an impact parameter resolution of 20 m for tracks with high transverse momentum. Charged hadrons are identified using two ring-imaging Cherenkov detectors. Photon, electron, and hadron candidates are identified by a calorimeter system consisting of scintillating-pad and preshower detectors, an electromagnetic calorimeter, and a hadronic calorimeter. Muons are identified by a system composed of alternating layers of iron and multiwire proportional chambers. The trigger [10] consists of a hardware stage, based on information from the calorimeter and muon systems, followed by a software stage which applies a full event reconstruction.Precision mass measurements require the momenta of the final state particles to be determined accurately. Therefore, an important feature of this analysis is the calibration of the tracker response. This accounts for imperfect knowledge of the magnetic field and tracker alignment [11]. In order to reduce these dominant contributions to the systematic uncertainty, a two-step momentum calibration

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supporting

confidence: 78%

“…The total systematic uncertainty is obtained from adding all uncertainties in quadrature. Comparison of the b-baryon mass measurements using the full 2011 data sample with the single most precise results from the ATLAS [15], CDF [5,16], and D0 [4,6] PRL 110, 182001 (2013) P H Y S I C A L R E V I E W L E T T E R S week ending 3 MAY 2013 182001-4…”

mentioning

confidence: 99%

Measurement of theΛb0,Ξb−, andΩb−

Aaij¹,

Beteta²,

Adametz³

et al. 2013

Phys. Rev. Lett.

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“…These baryons can be neutral (valence quark content u À s À b) or negatively charged (d À s À b). At the Tevatron, baryons with masses and decay modes consistent with the theoretical predictions for the ground state Ä b baryons have been observed [1][2][3], although their quantum numbers have not yet been established. The allowed decays of the experimentally missing Ä b states should be analogous to the charmed sector [4][5][6].…”

mentioning

confidence: 83%

Observation of a NewΞbBaryon

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2012

Phys. Rev. Lett.

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117

105

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The observation of a new b baryon via its strong decay into Ä À b þ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at ffiffi ffi s p ¼ 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5:3 fb À1 . The known Ä À b baryon is reconstructed via the decay chain Ä À b ! J=c Ä À ! þ À Ã 0 À , with Ã 0 ! p À . A peak is observed in the distribution of the difference between the mass of the Ä À b þ system and the sum of the masses of the Ä À b and þ , with a significance exceeding 5 standard deviations. The mass difference of the peak is 14:84 AE 0:74ðstatÞ AE 0:28ðsystÞ MeV. The new state most likely corresponds to the J P ¼ 3=2 þ companion of the Ä b . DOI: 10.1103/PhysRevLett.108.252002 PACS numbers: 14.20.Mr According to the well-established quark model and corresponding spectroscopy of baryons, there are several predicted baryons containing one strange and one beauty valence quark. These include the Ä b (ground state) and Ä 0 b , both with total angular momentum and parity J P ¼ 1=2 þ , a J P ¼ 3=2 þ state with angular momentum L ¼ 0 (often referred to, as will be done in this Letter, as Ä Ã b ), and two states with J P ¼ 1=2 À and 3=2 À , both with angular momentum L ¼ 1. These baryons can be neutral (valence quark content u À s À b) or negatively charged (d À s À b). At the Tevatron, baryons with masses and decay modes consistent with the theoretical predictions for the ground state Ä b baryons have been observed [1][2][3], although their quantum numbers have not yet been established. The allowed decays of the experimentally missing Ä b states should be analogous to the charmed sector [4][5][6]. In addition, theoretical calculations [7][8][9][10][11] predict the mass difference between the Ä 0 b and Ä b to be smaller than the mass of the pion, in which case the strong decay Ä 0 b ! Ä b is kinematically forbidden. The mass difference between the Ä Ã b and Ä b , however, is expected to be large enough to allow such a decay.This Letter presents a search for the decay . The CMS apparatus is described in detail in Ref. [12]. Its central feature is a superconducting solenoid, of 6 m internal diameter, providing a field of 3.8 T. The main subdetectors used in this analysis are the silicon tracker and the muon systems. The silicon tracker, composed of pixel and strip detector modules, is immersed in the magnetic field, and enables the measurement of charged particle momenta over the pseudorapidity range jj < 2:5, where ¼ À lnðtan=2Þ and is the polar angle of the track relative to the counterclockwise beam direction. Muons are identified in the range jj < 2:4 using gas-ionization detectors embedded in the steel return yoke of the magnet.The events used in this analysis were collected using the two-level trigger system of CMS. The first level consists of custom hardware processors and uses information from the muon systems to select events with two muons. The ''highlevel trigger'' processor farm further decreases the event rate befor...

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“…Since then, the CDF collaboration reported the observation of Σ + b and Σ * + b in 2006 [1], and the DØ Collaboration presented the Ξ − b in 2007 [2] followed by its confirmation by CDF the same year [3]. In 2008, DØ reported the observation of another b-baryon: the Ω − b [4].…”

Section: B B B-baryon Observationmentioning

confidence: 97%

“…The replacement of multivariate techniques with a selection of Ω − candidates based on cuts reduces the significance of the signal to 3.9 σ because of the presence of a higher background, but still yields a consistent mass and number of events. The combination of events obtained from both selections: 2 The width of the Gaussian is fixed to that of the MC Ω the BDT-based plus the cuts-based, gives a signal with significance 5.4 σ , 25.5 ± 6.5 (stat) events and consistent mass -after the removal of event double counting-.…”

Section: Crosschecksmentioning

confidence: 99%

Observation of the Doubly Strange b Baryon Omega-_b with the D0 Detector

Jesus¹

2010

Proceedings of European Physical Society Europhysics Conference on High Energy Physics — PoS(EPS-HEP 2009)

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CINVESTAV Mexico E-mail: jjesus@fnal.govWe report the first observation of the doubly strange b-baryon Ω − b in the decay channelUsing approximately 1.3 fb −1 of data collected with the DØ detector at the Fermilab Tevatron Collider, we observe 17.8 ± 4.9 (stat) ± 0.8 (syst) Ω − b signal events at a mass of 6.165 ± 0.010 (stat) ± 0.013 (syst) GeV/c 2 with a significance of 5.4 σ , meaning that the probability of the signal coming from a fluctuation in the background is 6.7 × 10 −8 .

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Direct Observation of the StrangebBaryonΞb−

Cited by 115 publications

References 11 publications

Measurement of theΛb0,Ξb−, andΩb−

Measurement of theΛb0,Ξb−, andΩb−

Observation of a NewΞbBaryon

Observation of the Doubly Strange b Baryon Omega-_b with the D0 Detector

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