Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states

J. P. Lees; V. Poireau; V. Tisserand; E. Grauges; A. Palano; G. Eigen; B. Stugu; D. N. Brown; L. T. Kerth; Yu G. Kolomensky; M. J. Lee; G. Lynch; H. Koch; T. Schroeder; C. Hearty; T. S. Mattison; J. A. McKenna; R. Y. So; A. Khan; V. E. Blinov; A. R. Buzykaev; V. P. Druzhinin; V. B. Golubev; E. A. Kravchenko; A. P. Onuchin; S. I. Serednyakov; Yu I. Skovpen; E. P. Solodov; K. Yu Todyshev; A. N. Yushkov; A. J. Lankford; M. Mandelkern; B. Dey; J. W. Gary; O. Long; C. Campagnari; M. Franco Sevilla; T. M. Hong; D. Kovalskyi; J. D. Richman; C. A. West; A. M. Eisner; W. S. Lockman; B. A. Schumm; A. Seiden; D. S. Chao; C. H. Cheng; B. Echenard; K. T. Flood; D. G. Hitlin; T. S. Miyashita; P. Ongmongkolkul; F. C. Porter; R. Andreassen; Z. Huard; B. T. Meadows; B. G. Pushpawela; M. D. Sokoloff; L. Sun; P. C. Bloom; W. T. Ford; A. Gaz; U. Nauenberg; J. G. Smith; S. R. Wagner; R. Ayad; W. H. Toki; B. Spaan; R. Schwierz; D. Bernard; M. Verderi; S. Playfer; D. Bettoni; C. Bozzi; R. Calabrese; G. Cibinetto; E. Fioravanti; I. Garzia; E. Luppi; L. Piemontese; V. Santoro; A. Calcaterra; R. De Sangro; G. Finocchiaro; S. Martellotti; P. Patteri; I. M. Peruzzi; M. Piccolo; M. Rama; A. Zallo; R. Contri; E. Guido; M. Lo Vetere; M. R. Monge; S. Passaggio; C. Patrignani; E. Robutti; B. Bhuyan; V. Prasad

doi:10.1103/PhysRevLett.112.211802

Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states

J. P. Lees
, V. Poireau
, V. Tisserand
, E. Grauges
, A. Palano
, G. Eigen
, B. Stugu
, D. N. Brown
, L. T. Kerth
, Yu G. Kolomensky
, M. J. Lee
, G. Lynch
, H. Koch
, T. Schroeder
, C. Hearty
, T. S. Mattison
, J. A. McKenna
, R. Y. So
, A. Khan
, V. E. Blinov

A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu I. Skovpen, E. P. Solodov, K. Yu Todyshev, A. N. Yushkov, A. J. Lankford, M. Mandelkern, B. Dey, J. W. Gary, O. Long, C. Campagnari, M. Franco Sevilla, T. M. Hong, D. Kovalskyi, J. D. Richman, C. A. West, A. M. Eisner, W. S. Lockman, B. A. Schumm, A. Seiden, D. S. Chao, C. H. Cheng, B. Echenard, K. T. Flood, D. G. Hitlin, T. S. Miyashita, P. Ongmongkolkul, F. C. Porter, R. Andreassen, Z. Huard, B. T. Meadows, B. G. Pushpawela, M. D. Sokoloff, L. Sun, P. C. Bloom, W. T. Ford, A. Gaz, U. Nauenberg, J. G. Smith, S. R. Wagner, R. Ayad, W. H. Toki, B. Spaan, R. Schwierz, D. Bernard, M. Verderi, S. Playfer, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, L. Piemontese, V. Santoro, A. Calcaterra, R. De Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. M. Peruzzi, M. Piccolo, M. Rama, A. Zallo, R. Contri, E. Guido, M. Lo Vetere, M. R. Monge, S. Passaggio, C. Patrignani, E. Robutti, B. Bhuyan, V. Prasad

Research output: Contribution to journal › Article › peer-review

124 Scopus citations

Abstract

We measure the total branching fraction of the flavor-changing neutral-current process B→Xℓ+ℓ-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 (4S)→BB̄ events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xℓ+ℓ-)=[6.73-0.64+0.70(stat)-0. 25+0.34(exp syst)±0.50(model syst)]×10-6 for mℓ+ℓ-2>0. 1GeV2/c4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor- averaged sample.

Original language	English
Article number	211802
Journal	Physical Review Letters
Volume	112
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.112.211802
State	Published - 30 May 2014
Externally published	Yes

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10.1103/PhysRevLett.112.211802

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Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D. N., Kerth, L. T., Kolomensky, Y. G., Lee, M. J., Lynch, G., Koch, H., Schroeder, T., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Khan, A., ... Prasad, V. (2014). Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states. Physical Review Letters, 112(21), Article 211802. https://doi.org/10.1103/PhysRevLett.112.211802

@article{6a46c46ea46a4a6980dc2bb94ee31dae,

title = "Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states",

abstract = "We measure the total branching fraction of the flavor-changing neutral-current process B→Xℓ+ℓ-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 (4S)→B{\=B} events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xℓ+ℓ-)=[6.73-0.64+0.70(stat)-0. 25+0.34(exp syst)±0.50(model syst)]×10-6 for mℓ+ℓ-2>0. 1GeV2/c4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor- averaged sample.",

author = "Lees, \{J. P.\} and V. Poireau and V. Tisserand and E. Grauges and A. Palano and G. Eigen and B. Stugu and Brown, \{D. N.\} and Kerth, \{L. T.\} and Kolomensky, \{Yu G.\} and Lee, \{M. J.\} and G. Lynch and H. Koch and T. Schroeder and C. Hearty and Mattison, \{T. S.\} and McKenna, \{J. A.\} and So, \{R. Y.\} and A. Khan and Blinov, \{V. E.\} and Buzykaev, \{A. R.\} and Druzhinin, \{V. P.\} and Golubev, \{V. B.\} and Kravchenko, \{E. A.\} and Onuchin, \{A. P.\} and Serednyakov, \{S. I.\} and Skovpen, \{Yu I.\} and Solodov, \{E. P.\} and Todyshev, \{K. Yu\} and Yushkov, \{A. N.\} and Lankford, \{A. J.\} and M. Mandelkern and B. Dey and Gary, \{J. W.\} and O. Long and C. Campagnari and \{Franco Sevilla\}, M. and Hong, \{T. M.\} and D. Kovalskyi and Richman, \{J. D.\} and West, \{C. A.\} and Eisner, \{A. M.\} and Lockman, \{W. S.\} and Schumm, \{B. A.\} and A. Seiden and Chao, \{D. S.\} and Cheng, \{C. H.\} and B. Echenard and Flood, \{K. T.\} and Hitlin, \{D. G.\} and Miyashita, \{T. S.\} and P. Ongmongkolkul and Porter, \{F. C.\} and R. Andreassen and Z. Huard and Meadows, \{B. T.\} and Pushpawela, \{B. G.\} and Sokoloff, \{M. D.\} and L. Sun and Bloom, \{P. C.\} and Ford, \{W. T.\} and A. Gaz and U. Nauenberg and Smith, \{J. G.\} and Wagner, \{S. R.\} and R. Ayad and Toki, \{W. H.\} and B. Spaan and R. Schwierz and D. Bernard and M. Verderi and S. Playfer and D. Bettoni and C. Bozzi and R. Calabrese and G. Cibinetto and E. Fioravanti and I. Garzia and E. Luppi and L. Piemontese and V. Santoro and A. Calcaterra and \{De Sangro\}, R. and G. Finocchiaro and S. Martellotti and P. Patteri and Peruzzi, \{I. M.\} and M. Piccolo and M. Rama and A. Zallo and R. Contri and E. Guido and \{Lo Vetere\}, M. and Monge, \{M. R.\} and S. Passaggio and C. Patrignani and E. Robutti and B. Bhuyan and V. Prasad",

year = "2014",

month = may,

day = "30",

doi = "10.1103/PhysRevLett.112.211802",

language = "English",

volume = "112",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "21",

}

Lees, JP, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Stugu, B, Brown, DN, Kerth, LT, Kolomensky, YG, Lee, MJ, Lynch, G, Koch, H, Schroeder, T, Hearty, C, Mattison, TS, McKenna, JA, So, RY, Khan, A, Blinov, VE, Buzykaev, AR, Druzhinin, VP, Golubev, VB, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, YI, Solodov, EP, Todyshev, KY, Yushkov, AN, Lankford, AJ, Mandelkern, M, Dey, B, Gary, JW, Long, O, Campagnari, C, Franco Sevilla, M, Hong, TM, Kovalskyi, D, Richman, JD, West, CA, Eisner, AM, Lockman, WS, Schumm, BA, Seiden, A, Chao, DS, Cheng, CH, Echenard, B, Flood, KT, Hitlin, DG, Miyashita, TS, Ongmongkolkul, P, Porter, FC, Andreassen, R, Huard, Z, Meadows, BT, Pushpawela, BG, Sokoloff, MD, Sun, L, Bloom, PC, Ford, WT, Gaz, A, Nauenberg, U, Smith, JG, Wagner, SR, Ayad, R, Toki, WH, Spaan, B, Schwierz, R, Bernard, D, Verderi, M, Playfer, S, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Piemontese, L, Santoro, V, Calcaterra, A, De Sangro, R, Finocchiaro, G, Martellotti, S, Patteri, P, Peruzzi, IM, Piccolo, M, Rama, M, Zallo, A, Contri, R, Guido, E, Lo Vetere, M, Monge, MR, Passaggio, S, Patrignani, C, Robutti, E, Bhuyan, B & Prasad, V 2014, 'Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states', Physical Review Letters, vol. 112, no. 21, 211802. https://doi.org/10.1103/PhysRevLett.112.211802

TY - JOUR

T1 - Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states

AU - Lees, J. P.

AU - Poireau, V.

AU - Tisserand, V.

AU - Grauges, E.

AU - Palano, A.

AU - Eigen, G.

AU - Stugu, B.

AU - Brown, D. N.

AU - Kerth, L. T.

AU - Kolomensky, Yu G.

AU - Lee, M. J.

AU - Lynch, G.

AU - Koch, H.

AU - Schroeder, T.

AU - Hearty, C.

AU - Mattison, T. S.

AU - McKenna, J. A.

AU - So, R. Y.

AU - Khan, A.

AU - Blinov, V. E.

AU - Buzykaev, A. R.

AU - Druzhinin, V. P.

AU - Golubev, V. B.

AU - Kravchenko, E. A.

AU - Onuchin, A. P.

AU - Serednyakov, S. I.

AU - Skovpen, Yu I.

AU - Solodov, E. P.

AU - Todyshev, K. Yu

AU - Yushkov, A. N.

AU - Lankford, A. J.

AU - Mandelkern, M.

AU - Dey, B.

AU - Gary, J. W.

AU - Long, O.

AU - Campagnari, C.

AU - Franco Sevilla, M.

AU - Hong, T. M.

AU - Kovalskyi, D.

AU - Richman, J. D.

AU - West, C. A.

AU - Eisner, A. M.

AU - Lockman, W. S.

AU - Schumm, B. A.

AU - Seiden, A.

AU - Chao, D. S.

AU - Cheng, C. H.

AU - Echenard, B.

AU - Flood, K. T.

AU - Hitlin, D. G.

AU - Miyashita, T. S.

AU - Ongmongkolkul, P.

AU - Porter, F. C.

AU - Andreassen, R.

AU - Huard, Z.

AU - Meadows, B. T.

AU - Pushpawela, B. G.

AU - Sokoloff, M. D.

AU - Sun, L.

AU - Bloom, P. C.

AU - Ford, W. T.

AU - Gaz, A.

AU - Nauenberg, U.

AU - Smith, J. G.

AU - Wagner, S. R.

AU - Ayad, R.

AU - Toki, W. H.

AU - Spaan, B.

AU - Schwierz, R.

AU - Bernard, D.

AU - Verderi, M.

AU - Playfer, S.

AU - Bettoni, D.

AU - Bozzi, C.

AU - Calabrese, R.

AU - Cibinetto, G.

AU - Fioravanti, E.

AU - Garzia, I.

AU - Luppi, E.

AU - Piemontese, L.

AU - Santoro, V.

AU - Calcaterra, A.

AU - De Sangro, R.

AU - Finocchiaro, G.

AU - Martellotti, S.

AU - Patteri, P.

AU - Peruzzi, I. M.

AU - Piccolo, M.

AU - Rama, M.

AU - Zallo, A.

AU - Contri, R.

AU - Guido, E.

AU - Lo Vetere, M.

AU - Monge, M. R.

AU - Passaggio, S.

AU - Patrignani, C.

AU - Robutti, E.

AU - Bhuyan, B.

AU - Prasad, V.

PY - 2014/5/30

Y1 - 2014/5/30

N2 - We measure the total branching fraction of the flavor-changing neutral-current process B→Xℓ+ℓ-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 (4S)→BB̄ events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xℓ+ℓ-)=[6.73-0.64+0.70(stat)-0. 25+0.34(exp syst)±0.50(model syst)]×10-6 for mℓ+ℓ-2>0. 1GeV2/c4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor- averaged sample.

AB - We measure the total branching fraction of the flavor-changing neutral-current process B→Xℓ+ℓ-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 (4S)→BB̄ events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xℓ+ℓ-)=[6.73-0.64+0.70(stat)-0. 25+0.34(exp syst)±0.50(model syst)]×10-6 for mℓ+ℓ-2>0. 1GeV2/c4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor- averaged sample.

UR - https://www.scopus.com/pages/publications/84901938176

U2 - 10.1103/PhysRevLett.112.211802

DO - 10.1103/PhysRevLett.112.211802

M3 - Article

AN - SCOPUS:84901938176

SN - 0031-9007

VL - 112

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

M1 - 211802

ER -

Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states

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